how to create form application using .NET.

In interview, mostly question asked by the Technical HR will be relate to form applicaton apllication. To develop any software one should know how to create create store procedure. In this we have created one small application which may help you to understand the basic concept how to develop an application.

Login proc
CREATE PROCEDURE [dbo].[login_proc]
(
@UserId varchar(50),
@User_Password varchar(50)
)
AS
Begin
Select @UserId from Emp_Login where UserId=@UserId and User_Password=@User_Password
END

Proc_std_Delete
CREATE PROCEDURE [dbo].[Proc_std_Delete]
(
@Enrollment_number int
)
 
AS
BEGIN
IF NOT EXISTS (SELECT Enrollment_number FROM
Std_Details 
               where 
Enrollment_number = @Enrollment_number)
                     begin
                                                                   print 'Data does not exist or
Enrollemt Id is wrong';
                                                end    
                     
else
begin
                   
delete from Std_Details
where
Enrollment_number =
@Enrollment_number
print 'Deleted record successfully';                                                         
end    
 
end

ALTER PROCEDURE [dbo].[Proc_std_Info]
(
@Enrollment_number int ,
@Student_name varchar(50),
@Father_Name varchar(50),
@Mother_Name varchar(50),
@Sex varchar(50),
@Permanent_Add varchar(50),
@Permanent_State varchar(50),
@Subject_Maths varchar(30),
@Subject_Physics varchar(30),
@Subject_Chemistry varchar(30),
@Subject_English varchar(30),
@Subject_Hindi varchar(30),
@Subject_Social varchar(30),
@class varchar(30)
)
 
AS
BEGIN
IF NOT EXISTS (SELECT Enrollment_number FROM
Std_Details
               where 
Enrollment_number = @Enrollment_number)
                     BEGIN
INSERT INTO Std_Details
(Enrollment_number,[Student_name],[Father_Name],[Mother_Name],[Sex],[Permanent_Add],[Permanent_State])
values (@Enrollment_number,@Student_name,@Father_Name,@Mother_Name,@Sex,@Permanent_Add,@Permanent_State)                    
                                                                   
INSERT INTO Std_Opt_Sub
(Enrollment_number,[Subject_Maths],[Subject_Physics],[Subject_Chemistry],[Subject_English],[Subject_Hindi],[Subject_Social],[Opt_Begin_Date],[Opt_End_Date],[class])
values (@Enrollment_number,@Subject_Maths,@Subject_Physics,@Subject_Chemistry,@Subject_English,@Subject_Hindi,@Subject_Social,GETDATE(),'2299-12-31',@class)
                     
                     END
                     
else
                                                begin
                                                                   print 'Data already exist';
                                                end    
 
 end

ALTER PROCEDURE [dbo].[Proc_std_Update]
(
@Enrollment_number int ,
@Student_name varchar(50),
@Father_Name varchar(50),
@Mother_Name varchar(50),
@Sex varchar(50),
@Permanent_Add varchar(50),
@Permanent_State varchar(50),
@Subject_Maths varchar(30),
@Subject_Physics varchar(30),
@Subject_Chemistry varchar(30),
@Subject_English varchar(30),
@Subject_Hindi varchar(30),
@Subject_Social varchar(30),
@class varchar(30)
)
 
AS
BEGIN
IF NOT EXISTS (SELECT Enrollment_number FROM
Std_Details
               where 
Enrollment_number = @Enrollment_number)
                     begin
                                                                   print 'Data does not exist or
Enrollemt Id is wrong';
                                                end    
                     
else
begin
                             
 
Update Std_Details
set  Student_name= @Student_name,
Father_Name=@Father_Name,
Mother_Name=@Mother_Name,
Sex=@Sex,
Permanent_Add=@Permanent_Add,
Permanent_State=@Permanent_State
 
where
Enrollment_number =
@Enrollment_number
                                                                   
Update Std_Opt_Sub 
set                         
Subject_Maths=@Subject_Maths ,
Subject_Physics=@Subject_Physics
,
Subject_Chemistry=@Subject_Chemistry
,
Subject_English=@Subject_English
,
Subject_Hindi=@Subject_Hindi,
Subject_Social=@Subject_Social,
Class=@class
where                                                 
Enrollment_number =
@Enrollment_number
 
end    
 
end

ALTER PROCEDURE [dbo].[Proc_user_insert]
(
@UserId varchar (30),
@User_Password VARCHAR (100),
@Name varchar(30),
@Password_Hint varchar(30)
)
 
AS
BEGIN
IF NOT EXISTS (SELECT UserId FROM
User_information
               where  @UserId = UserId)
                     begin
                                                                   insert into
User_information ([UserId],[User_Password],[Name],[Password_Hint])
                                                                   values (@UserId, @User_Password,@Name,@Password_Hint)
                                                                   print 'Data Inserted
Successfully';          
                                                 end   
else
begin           
print 'Data Already Exist';                                                  
end    
end

ALTER PROCEDURE [dbo].[Proc_user_insert1]
(
@UserId varchar (30),
@User_Password varchar (100),
@Name varchar(30),
@Password_Hint varchar(30)
)
 
AS
BEGIN
IF NOT EXISTS (SELECT UserId FROM
User_information
               where  @UserId = UserId)
                     begin
                                                                   insert into
User_information ([UserId],[User_Password],[Name],[Password_Hint])
                                                                   values (@UserId,HASHBYTES('SHA2_512',@User_Password),@Name,@Password_Hint)
                                                                   print 'Data Inserted
Successfully';          
                                                 end   
else
begin           
print 'Data Already Exist';                                                  
end    
end

ALTER PROCEDURE [dbo].[User_Info]
(
@UserId varchar(50),
@Old_Password varchar(50),
@New_Password varchar(50),
@confirm_new_password varchar(50),
@Password_Hint varchar(50)
)
 
AS
BEGIN
 
         IF NOT EXISTS (SELECT UserId FROM User_information 
                        
where 
UserId = @UserId)
                     BEGIN
                              
PRINT 'No Such
UserId Exist'
                     END
        ELSE
        begin   
        declare @checkpass varchar(30);
                             set     @checkpass= (SELECT User_Password
FROM User_information where  UserId =
@UserId)
                                                          if (@Checkpass<> @Old_Password)
                                                          begin
                                                          print 'old password is wrong'
                                                          end
                                                          
                                                          ELSE
                                                                             IF (@New_Password <> @confirm_new_password)
                                                                                      BEGIN
                                                                                      PRINT 'Password doesn''t
match'
                                                                                      END
                                                                             ELSE
                                                                                      BEGIN
                                                                                      UPDATE 
User_information 
                                                                                      SET User_Password=
@confirm_new_password , Password_Hint= @Password_Hint
                                                                                       WHERE UserId =
@UserId
                                                                             END
                   END   
END

Code
for from1
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using
System.Windows.Forms;
using
System.Data.SqlClient;
 
namespace FormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
       public  int i=0, j=0, k=0;
        private void button1_Click(object sender, EventArgs e)
        {  
SqlConnection
con = new SqlConnection();
            con.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User ID=sa;Password=mindstick");
            con.Open();
           
            SqlCommand cmd = new SqlCommand("Select
UserId from User_information where UserId=@UserId and
User_Password=@User_Password", con);
            //  
SqlCommand cmd = new SqlCommand("Login_Check_Sp", con);
            // cmd.CommandType =
CommandType.StoredProcedure;
            DataTable dt = new DataTable();
            cmd.Parameters.AddWithValue("@UserId", textBox1.Text);
            cmd.Parameters.AddWithValue("@User_Password", textBox2.Text);
            SqlDataReader read =
cmd.ExecuteReader();
            read.Read();
            if (textBox1.Text.Trim() == string.Empty)
            {
                MessageBox.Show("Userid need
to be fill","Warning
message");
                i++;
            }
            else
            {
                if
(textBox2.Text.Trim() == string.Empty)
                {
                    MessageBox.Show("Password
Required!!",
"Warning message");
                    j++;
                }
                else
                {
                    if (read.HasRows)
                    {
                        //here you may
redirect to another page like Response.Redirect("Page2.aspx");
                        Form2 objfill = new Form2();
                        objfill.Show();
                        this.Hide();
 
                        con.Close();
                    }
                    else
                    {
                        MessageBox.Show("Your UserId,
Password or both are wrong ", "Error Message");
                        k++;
                    }
                }
            }
            if (i > 3 )
            {
                MessageBox.Show("Attempt for
Userid Is greater than 3, please reopen","Error
Message");
               
this.Close();
            }
            if ( j > 3)
            {
                MessageBox.Show("Attempt for
Password Is greater than 3, please repen and set your password","Error
Messaage");
                this.Close();
            }
            if (k>3)
            {
                MessageBox.Show("Attempt for
Password Is greater than 3, please repen and set your password","Error
Message");
                this.Close();
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Form3 F3 = new Form3();
            F3.Show();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void
textBox2_TextChanged(object sender, EventArgs e)
        {
            textBox2.MaxLength = 8;
            textBox2.PasswordChar = '*';
        }
        private void
textBox1_TextChanged(object sender, EventArgs e)
        {
            textBox1.MaxLength = 16;
 
        }
    }
}

Code
for from2
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Threading.Tasks;
using
System.Windows.Forms;
using
System.Data.SqlClient;
using System.Data.SqlTypes;
 
 
namespace FormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            this.Close();
 
            Form1 objform1 = new Form1();
            objform1.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            /* inserting a new details*/
            SqlConnection con2 = new SqlConnection();
            con2.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            con2.Open();
            SqlCommand savecom = new SqlCommand("Proc_std_Info", con2);
            savecom.Connection = con2;
            savecom.CommandType = CommandType.StoredProcedure;
            savecom.Parameters.AddWithValue("@Student_name", textBox2.Text);
            savecom.Parameters.AddWithValue("@Father_Name", textBox3.Text);
            savecom.Parameters.AddWithValue("@Mother_Name", textBox4.Text);
            if (radioButton1.Checked == true ||
radioButton2.Checked == true)
            {
                if
(radioButton1.Checked == true)
                {
                    savecom.Parameters.AddWithValue("@Sex", "Male");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Sex", "Female");
                }
            }
            else
            {
                savecom.Parameters.AddWithValue("@Sex", " ");
            }
            savecom.Parameters.AddWithValue("@Permanent_Add", textBox5.Text);
            savecom.Parameters.AddWithValue("@Permanent_State",comboBox1.Text);
            int a;
            if (int.TryParse(textBox1.Text.ToString(), out a) ||
(textBox1.Text.Trim() == string.Empty))
            {
 
                
 
                if (checkBox1.Checked
== true)
                {
 
                   
savecom.Parameters.AddWithValue("@Subject_Maths", "Selected ");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Subject_Maths", "Not
Selected");
                }
                if (checkBox2.Checked
== true)
                {
                    savecom.Parameters.AddWithValue("@Subject_Physics", "Selected");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Subject_Physics", "Not
Selected");
                }
 
                if (checkBox3.Checked
== true)
                {
                   
savecom.Parameters.AddWithValue("@Subject_Chemistry", "Selected");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Subject_Chemistry", "Not
Selected");
                }
 
 
                if (checkBox4.Checked
== true)
                {
                   
savecom.Parameters.AddWithValue("@Subject_English", "Selected");
                }
                else
                {
                    savecom.Parameters.AddWithValue("@Subject_English", "Not
Selected");
                }
 
                if (checkBox5.Checked
== true)
                {
                   
savecom.Parameters.AddWithValue("@Subject_Hindi ", "Selected");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Subject_Hindi", "Not
Selected");
                }
                if (checkBox6.Checked
== true)
                {
                    savecom.Parameters.AddWithValue("@Subject_Social", "Selected");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Subject_Social", "Not
Selected");
                }
                savecom.Parameters.AddWithValue("@Class", comboBox2.Text);
 
                if
(textBox1.Text.Trim() == string.Empty)
                {
                    MessageBox.Show("Please enter
the User Id","Warning
message");
                }
                else
                {
                   
savecom.Parameters.AddWithValue("@Enrollment_number", Convert.ToInt32(textBox1.Text));
                    if
(textBox2.Text.Trim() == string.Empty)
                    {
                        MessageBox.Show("Please enter
Name");
                    }
                    else
                    {
                        if
(radioButton1.Checked == false &&
radioButton2.Checked == false)
                        {
                            MessageBox.Show("Select male
or female",
"Warning message");
                        }
                        else
                        {
                            if (checkBox1.Checked
== false &&
checkBox2.Checked == false &&
checkBox3.Checked == false &&
checkBox4.Checked == false &&
checkBox5.Checked == false &&
checkBox6.Checked == false)
                            {
 
                                MessageBox.Show("Select At
least one Subject",
"Warning message");
 
                            }
                            else
                            {
                                
                                SqlCommand cmd = new SqlCommand("Select
Enrollment_number from Std_Details where Enrollment_number=@UserId", con2);
                                //   SqlCommand cmd = new
SqlCommand("Login_Check_Sp", con);
                                // cmd.CommandType =
CommandType.StoredProcedure;
                                DataTable dt = new DataTable();
                                cmd.Parameters.AddWithValue("@UserId", textBox1.Text);
                                SqlDataReader read =
cmd.ExecuteReader();
                                read.Read();
 
                                if (read.HasRows)
                                {
                                    MessageBox.Show("Already Have
data ","Informational
Message");
 
                                }
                                else
                                {
                                    read.Close();
                                   
savecom.ExecuteNonQuery();
                                    SqlCommand cmd1 = new SqlCommand("Select
Enrollment_number from Std_Details where Enrollment_number=@UserId", con2);
                                    //  
SqlCommand cmd = new SqlCommand("Login_Check_Sp", con);
                                    // cmd.CommandType =
CommandType.StoredProcedure;
                                    DataTable dt1 = new DataTable();
                                    cmd1.Parameters.AddWithValue("@UserId", textBox1.Text);
                                    SqlDataReader read1 =
cmd1.ExecuteReader();
                                   
read1.Read();
                                    if (read1.HasRows)
                                    {
                                        MessageBox.Show("Inserted
Successfully",
"Congrats!!!");
 
                                    }
                                    else
                                    {
                                        MessageBox.Show("Enrollement
Id Is not valid",
"Error Message");
                                    }
                                }
                            }
                        }
                    }
 
 
                }
            }
            else
            {
                MessageBox.Show("Please enter
the correct format of enrollment id","Warning message");
            }
 
            
            con2.Close();
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            /* inserting a new details*/
            SqlConnection con3 = new SqlConnection();
            con3.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            con3.Open();
            SqlCommand savecom = new SqlCommand("Proc_std_Update", con3);
            savecom.Connection = con3;
            savecom.CommandType = CommandType.StoredProcedure;
 
            
            savecom.Parameters.AddWithValue("@Student_name", textBox2.Text);
            savecom.Parameters.AddWithValue("@Father_Name", textBox3.Text);
            savecom.Parameters.AddWithValue("@Mother_Name", textBox4.Text);
 
            if (radioButton1.Checked == true ||
radioButton2.Checked == true)
            {
                if
(radioButton1.Checked == true)
                {
                   
savecom.Parameters.AddWithValue("@Sex", "Male");
                }
                else
                {
                    savecom.Parameters.AddWithValue("@Sex", "Female");
                }
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Sex", " "); 
            }
           
            savecom.Parameters.AddWithValue("@Permanent_Add", textBox5.Text);
            savecom.Parameters.AddWithValue("@Permanent_State", comboBox1.Text);
            int a;
  
            if (int.TryParse(textBox1.Text.ToString(), out a) ||
(textBox1.Text.Trim() == string.Empty))
            {
                    if (checkBox1.Checked
== true)
                    {
 
            savecom.Parameters.AddWithValue("@Subject_Maths", "Selected
");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_Maths", "Not
Selected");
            }
            if (checkBox2.Checked == true)
            {
               
savecom.Parameters.AddWithValue("@Subject_Physics", "Selected");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_Physics", "Not
Selected");
            }
 
            if (checkBox3.Checked == true)
            {
               
savecom.Parameters.AddWithValue("@Subject_Chemistry", "Selected");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_Chemistry", "Not
Selected");
            }
 
 
            if (checkBox4.Checked == true)
            {
                savecom.Parameters.AddWithValue("@Subject_English", "Selected");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_English", "Not
Selected");
            }
 
            if (checkBox5.Checked == true)
            {
                savecom.Parameters.AddWithValue("@Subject_Hindi
",
"Selected");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_Hindi", "Not
Selected");
            }
            if (checkBox6.Checked == true)
            {
               
savecom.Parameters.AddWithValue("@Subject_Social", "Selected");
            }
            else
            {
               
savecom.Parameters.AddWithValue("@Subject_Social", "Not
Selected");
            }
            savecom.Parameters.AddWithValue("@Class", comboBox2.Text);
 
            if (textBox1.Text.Trim() == string.Empty)
            {
                MessageBox.Show("Please enter
the User Id",
"Warning message");
            }
            else
            {
                savecom.Parameters.AddWithValue("@Enrollment_number", Convert.ToInt32(textBox1.Text));
                if
(textBox2.Text.Trim() == string.Empty)
                {
                    MessageBox.Show("Please enter
Name",
"Warning message");
                }
                else
                {
                    if
(radioButton1.Checked == false &&
radioButton2.Checked == false)
                    {
                        MessageBox.Show("Select male
or female",
"Warning message");
                    }
                    else
                    {
                        if (checkBox1.Checked
== false &&
checkBox2.Checked == false &&
checkBox3.Checked == false &&
checkBox4.Checked == false &&
checkBox5.Checked == false &&
checkBox6.Checked == false)
                        {
 
                            MessageBox.Show("Select At
least one Subject",
"Warning message");
 
                        }
                        else
                        {
                            savecom.ExecuteNonQuery();
 
                            SqlCommand cmd = new SqlCommand("Select
Enrollment_number from Std_Details where Enrollment_number=@UserId", con3);
                            //   SqlCommand cmd = new
SqlCommand("Login_Check_Sp", con);
                            // cmd.CommandType =
CommandType.StoredProcedure;
                            DataTable dt = new DataTable();
                           
cmd.Parameters.AddWithValue("@UserId", textBox1.Text);
                            SqlDataReader read =
cmd.ExecuteReader();
                            read.Read();
 
                            if (read.HasRows)
                            {
                                MessageBox.Show("Updated
Successfully",
"Congrats!!!");
 
 
                            }
                            else
                            {
                                MessageBox.Show("Enrollement
Id Is not valid",
"Error Message");
 
                            }
                        }
                    }
                }
 
            }
 
            
            }
            else
            {
 
                MessageBox.Show("Please enter
the correct format of enrollment id", "Warning message");
            }
          
            con3.Close();
 
        }
        private void button5_Click(object sender, EventArgs e)
        {
            Form4 f4 = new Form4();
            f4.Show();
            f4.fill();
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
            SqlConnection con6 = new SqlConnection();
            con6.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            con6.Open();
            SqlCommand DeleteCom = new SqlCommand("Proc_std_Delete", con6);
            DeleteCom.Connection = con6;
            DeleteCom.CommandType = CommandType.StoredProcedure;
            
            int a;
            if (int.TryParse(textBox1.Text.ToString(), out a) || (textBox1.Text.Trim()
== string.Empty))
            {
 
               
DeleteCom.Parameters.AddWithValue("@Enrollment_number", textBox1.Text);
 
 
 
                SqlCommand cmd = new SqlCommand("Select
Enrollment_number from Std_Details where Enrollment_number=@UserId", con6);
                //   SqlCommand cmd = new
SqlCommand("Login_Check_Sp", con);
                // cmd.CommandType =
CommandType.StoredProcedure;
                DataTable dt = new DataTable();
                cmd.Parameters.AddWithValue("@UserId", textBox1.Text);
                SqlDataReader read =
cmd.ExecuteReader();
                read.Read();
 
                if (read.HasRows)
                {
                    DialogResult result2 = MessageBox.Show("Are you sure
do you want to delete", "Question", MessageBoxButtons.YesNoCancel,
MessageBoxIcon.Question);
                    if (result2 == DialogResult.Yes)
                    {
                        read.Close();
                       
DeleteCom.ExecuteNonQuery();
                        MessageBox.Show("Deleted
Successfully");
 
                        this.Close();
                        Form1 objlogin = new Form1();
                        objlogin.Show();
                    }
                    else
                    {
                        MessageBox.Show("No Account
has been updated ",
"Informational Message");
                    }
 
                }
                else
                {
                    MessageBox.Show("Enrollement
Id Is not valid or Already Deleted","Informatinal Error");
                }
            }
            else
            {
                MessageBox.Show("Enrollement
Id Format is not correct");
            }
          
 
           
            con6.Close();
        }
 
        public void textBox1_TextChanged(object sender, EventArgs e)
        {
 
            textBox1.MaxLength = 8;
            
        }
 
        public void textBox2_TextChanged(object sender, EventArgs e)
        {
            textBox2.MaxLength = 16;
        }
 
        public void textBox3_TextChanged(object sender, EventArgs e)
        {
            textBox3.MaxLength = 16;
        }
 
        public void textBox4_TextChanged(object sender, EventArgs e)
        {
            textBox4.MaxLength = 16;
        }
 
        public void textBox5_TextChanged(object sender, EventArgs e)
        {
            textBox5.MaxLength = 20;
        }
 
        public void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
           
        }
 
        public void Form2_Load(object sender, EventArgs e)
        {
              SqlConnection concombostate = new SqlConnection();
            concombostate.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            concombostate.Open();
                SqlCommand sc = new SqlCommand("select
List_of_state from Indian_state", concombostate);
                SqlDataReader reader;
                reader = sc.ExecuteReader();
                DataTable dt = new DataTable();
                dt.Columns.Add("List_of_state", typeof(string));
                dt.Load(reader);
                comboBox1.DisplayMember = "List_of_state";
                comboBox1.DataSource = dt;
             //   concombostate.Close();
                comboBox1.SelectedIndex = -1;
        }  
 
    }    
}

Code for form3

using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Threading.Tasks;
using
System.Windows.Forms;
using
System.Data.SqlClient;
namespace FormsApplication1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            con.Open();
            SqlCommand cmdreset = new SqlCommand("User_Info", con);
            cmdreset.Connection = con;
            cmdreset.CommandType = CommandType.StoredProcedure;
            cmdreset.Parameters.AddWithValue("@Old_Password", textBox1.Text);
            cmdreset.Parameters.AddWithValue("@UserId", textBox5.Text);
            cmdreset.Parameters.AddWithValue("@New_Password", textBox2.Text);
            cmdreset.Parameters.AddWithValue("@confirm_new_password", textBox3.Text);
            cmdreset.Parameters.AddWithValue("@Password_Hint", textBox4.Text);
 
            if (textBox5.Text.Trim() == string.Empty)
            {
                MessageBox.Show("Userid
required","Warning
Message");
 
            }
            else
            {
                if
(textBox1.Text.Trim() == string.Empty)
                {
                    MessageBox.Show("Old Password
Required!!","Warning
Message");
 
                }
                else
                {
                    if
(textBox2.Text.Trim() == string.Empty)
                    {
                        MessageBox.Show("New password
required","Warning
Message");
                    }
                    else
                    {
                        if
(textBox3.Text.Trim() == string.Empty)
                        {
                            MessageBox.Show("Confirm
Password Required","Warning
Message");
                        }
                        else
                        {
                           
cmdreset.ExecuteNonQuery();
                            SqlCommand cmd = new SqlCommand("Select
UserId from User_information where UserId=@UserId and User_Password=@User_Password", con);
                            //   SqlCommand cmd = new
SqlCommand("Login_Check_Sp", con);
                            // cmd.CommandType =
CommandType.StoredProcedure;
                            DataTable dt = new DataTable();
                            cmd.Parameters.AddWithValue("@UserId", textBox5.Text);
                           
cmd.Parameters.AddWithValue("@User_Password", textBox2.Text);
                            SqlDataReader read =
cmd.ExecuteReader();
                            read.Read();
 
                            if (read.HasRows)
                            {
                                //here you may
redirect to another page like Response.Redirect("Page2.aspx");
                                MessageBox.Show("Successfully
changed the Password ","Contrats Message");
                                read.Close();
                                this.Close();
                            }
                            else
                            {
                                read.Close();
 
                                SqlCommand cmd1 = new SqlCommand("Select
UserId from User_information where UserId=@UserId and
User_Password=@User_Password", con);
                                //   SqlCommand cmd = new SqlCommand("Login_Check_Sp",
con);
                                // cmd.CommandType =
CommandType.StoredProcedure;
                                DataTable dt1 = new DataTable();
                               
cmd1.Parameters.AddWithValue("@UserId", textBox5.Text);
                               
cmd1.Parameters.AddWithValue("@User_Password", textBox1.Text);
                                SqlDataReader read1 =
cmd1.ExecuteReader();
                                read1.Read();
 
                                if (read1.HasRows)
                                {
                                    //here you may
redirect to another page like Response.Redirect("Page2.aspx");
                                    MessageBox.Show("Password
mismatich ","Warning
Message");
                                   
read1.Close();
 
                                }
                                else
                                {
                                    MessageBox.Show("Old Password
is wrong","Warning
Message");
                                }
                            }
 
                            
                            con.Close();
                           
                        }
                    }
                }
            }
        }
 
            
 
        private void button2_Click  (object sender, EventArgs e)
        {
            this.Close();
        }
 
        private void
textBox1_TextChanged(object sender, EventArgs e)
        {
            textBox1.PasswordChar = '*';
            textBox1.MaxLength = 8;
        }
 
        private void
textBox2_TextChanged(object sender, EventArgs e)
        {
            textBox2.PasswordChar = '*';
            textBox2.MaxLength = 8;
        }
 
        private void
textBox3_TextChanged(object sender, EventArgs e)
        {
            textBox3.PasswordChar = '*';
            textBox3.MaxLength = 8;
        }
 
    }
}

Code for form4

using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Threading.Tasks;
using
System.Windows.Forms;
using
System.Data.SqlClient;
using
System.Data.SqlTypes;
 
namespace FormsApplication1
{
    public partial class Form4 : Form
    {
 
        public Form4()
        {
            InitializeComponent();
        }
 
        public void fill()
        {
            SqlConnection con3 = new SqlConnection();
            con3.ConnectionString = (@"Data
Source=msclient-012\sqlexpress;Initial Catalog=testing_st;User
ID=sa;Password=mindstick");
            DataSet ds = new DataSet();
 
            con3.Open();
            SqlCommand cmd = new SqlCommand("select
A.Enrollment_number,A.Student_name,A.Father_Name,A.Mother_Name,A.Sex,A.Permanent_Add,A.Permanent_State,B.Subject_Maths,B.Subject_Physics,B.Subject_Chemistry,B.Subject_English,B.Subject_Hindi,B.Subject_Social,B.class
FROM Std_Details A,Std_Opt_Sub B where A.Enrollment_number =
B.Enrollment_number",
con3);
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            da.Fill(ds);
            dataGridView1.DataSource =
ds.Tables[0];
 
        }
        public void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            // string profilename =
dataGridView1.Rows[0].Cells[1].Value.ToString();
            //            int a;
            //          int.TryParse(profilename, out a);
            //   
Form2 f2 = new Form2();
            //  
f2.textBox1.Text = profilename;
 
        }
 
        public void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
           /* Form2 f2 = new Form2();
            f2.textBox1.Text =
dataGridView1.CurrentRow.Cells["Enrollment_number"].Value.ToString();
            this.Close();*/
 
        }
    }
}

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how to create form application using .NET.

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