protected void GridView1_SelectedIndexChanged1(object sender, EventArgs e) { int employeeid = Convert.ToInt32(GridView1.SelectedDataKey.Value.ToString()); DataTable dt = empf.GetByEmployeeId(employeeid); txtUsername.Text = dt.Rows[0]["Username"].ToString(); txtEmployeeNo.Text = dt.Rows[0]["EmployeeNo"].ToString(); HiddenField1.Value = employeeid.ToString(); }