How to insert update delete data from database using c#.

Question

Anonymous User · Answer

.using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace testing_all_controls
{
    public partial class Gridviewes : System.Web.UI.Page
    {
        SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["testConnectionString"].ConnectionString);
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                filldata();
            }
        }
        private void filldata()
        {
            string sqlrt = "";
            sqlrt = "select id,name,age from test";
            cn.Open();
            SqlDataAdapter da = new SqlDataAdapter(sqlrt, cn);
            DataSet dt = new DataSet();
            da.Fill(dt);
            if (dt.Tables[0].Rows.Count == 0)
            {
                DataRow dr = dt.Tables[0].NewRow();
                dr["id"] = "No Record";
                dr["name"] = "No Record";
                dr["Age"]="No Record";
                   dt.Tables [0].Rows .Add (dr);
            }
            GridView1.DataSource = dt;
            GridView1.DataBind();
            cn.Close();
        }
        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Add")
            {
                TextBox txtname = (TextBox)GridView1.FooterRow.FindControl("txtname") as TextBox;
                TextBox txtage = (TextBox)GridView1.FooterRow.FindControl("txtage") as TextBox;
                string sqlrt = "insert into test(id,name,age) values('" + Guid.NewGuid().ToString().Substring(1, 6) + "','" + txtname.Text + "','" + txtage.Text + "')";
                SqlCommand cmd = new SqlCommand();
                cn.Open();
                cmd.CommandText = sqlrt;
                cmd.Connection = cn;
                cmd.ExecuteNonQuery();
                cn.Close();
                filldata();
            }
            if (e.CommandName == "Change") 
            {
                int index = Convert.ToInt32(e.CommandArgument.ToString());
                GridView1.EditIndex = index;
                filldata();
            }
            if (e.CommandName == "Cancels")
            {                
                GridView1.EditIndex = 0;
                filldata();
            }
            if (e.CommandName == "Save")
            {
                int index = Convert.ToInt32(e.CommandArgument.ToString());
                TextBox txtname = (TextBox)GridView1.Rows[index].FindControl("txtename") as TextBox;
                TextBox txtage = (TextBox)GridView1.Rows[index].FindControl("txteage") as TextBox;
                string id=Convert .ToString ( GridView1.DataKeys[index ].Value );
                string sqlrt = "update   test set name='" + txtname.Text + "',age='" + txtage.Text + "' where id='"+id+"'";
                SqlCommand cmd = new SqlCommand();
                cn.Open();
                cmd.CommandText = sqlrt;
                cmd.Connection = cn;
                cmd.ExecuteNonQuery();
                cn.Close();
                GridView1.EditIndex =-1;
                filldata();
            }
             if (e.CommandName == "Remove")
            {
                int index = Convert.ToInt32(e.CommandArgument.ToString());                
                string id=Convert .ToString ( GridView1.DataKeys[index ].Value );
                string sqlrt = "delete from test where id='"+id+"'";
                SqlCommand cmd = new SqlCommand();
                cn.Open();
                cmd.CommandText = sqlrt;
                cmd.Connection = cn;
                cmd.ExecuteNonQuery();
                cn.Close();
                filldata();
            }
        }
    }
}thanks.

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How to insert update delete data from database using c#.

Anonymous User

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