Please any one help me out button click event is not working

Hii i will shaare my code

In this code when click the valaditon is showing but when click to hit database it's not working

protected void Button2_Click(object sender, EventArgs e)

{

string luname = username.Value;

string lpassword = password.Value;

cmd = new SqlCommand("select User_Email,User_Password from Dim_Users where User_Email='"+luname+"',User_Password='"+lpassword+"'");

int i = cmd.ExecuteNonQuery();

if(i != 0)

{

Response.Redirect("Home.aspx");

con.Close();

}

else

{

Response.Redirect("Error.aspx");

con.Close();

}