I work in c# windows form vs 2015 selecting data from excel 
problem i face it
supose i have in excel file
user id dateprint
1001 22/02/2017

if try add this user 1001 again with date 23/02/2017
it must give me message this user found before
but this is not happen and this is actually my problem
my code

bool c = QRC.UserExists(textBox1.Text); 

bool b = UserExistsToday(); 

if (c == true) 

{ 

if (b == true) 

{ 

label8
label8.Text = "User added today"; 

} 

else 

{ 

label8

label8.Text = "User added before"; 

} 

} 

} 

else 

{ 

label8

label8.Text = "User added first time"; 

} 

my functions 

label6 represent datetoday 

label6 represent datetoday 

public bool UserExistsToday() 

{ 

OleDbConnection cn = newOleDbConnection(connection); 

string str = $"select * from [Sheet1$] WHERE UserNo='{textBox1.Text}' AND DatePrint = '{label6.Text}'"; 

OleDbCommand cmd = newOleDbCommand(str, cn); 

cn

cn.Open(); 

var reader = cmd.ExecuteReader(); 

return reader.HasRows; 

} 

public bool UserExists(string UserNo) 

{ 
OleDbConnection cn = newOleDbConnection(connection); 

string str = "SELECT UserNo FROM [Sheet1$] WHERE UserNo = @UserNo"; 

OleDbCommand cmd = newOleDbCommand(str, cn); 

cmd

cmd.Parameters.AddWithValue("@UserNo", UserNo); 

cn

cn.Open(); 

var reader = cmd.ExecuteReader(); 

return reader.HasRows; 

}