protected void BtnAdd_Click(object sender, EventArgs e)
 {
     dtcheck = obj.CheckTeacher(Convert.ToInt32(ddnteacher.SelectedValue));
     if (dtcheck.Rows.Count > 0)
     {
         lblmsg.Text = "Teacher Already Appointed As a Class Teacher";
     }
     if (dtcheck.Rows.Count <= 0)
     {
         i = obj.AddClassTeacher(Convert.ToInt32(ddnteacher.SelectedValue), Convert.ToInt32(ddnclass.SelectedValue), Convert.ToInt32(ddnsec.SelectedValue), "Yes", "Admin", 1, DateTime.Now.ToString());
         if (i > 0)
         {
             lblmsg.Text = "Data Has Been Added";
             BindData();
             ClearFields();
             Response.Redirect("AddClassTeacher.aspx");
         }
     }
 }