I need help for this asp.net with csharp code

protected void griddelete_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            using (SqlConnection con = new SqlConnection(cs))
            {
                GridViewRow updaterow = (GridViewRow)griddelete.Rows[e.RowIndex];
                TextBox updatel1 = (TextBox)updaterow.FindControl("txtempidrow");
                TextBox updatel2 = (TextBox)updaterow.FindControl("txtnamerow");
                TextBox updatel3 = (TextBox)updaterow.FindControl("txtjobrow");
                string update = "update emp set job=@job,ename=@ename where empno=@empno";
                con.Open();
                SqlCommand cmd = new SqlCommand(update,con);

                cmd.Parameters.AddWithValue("@empno", updatel1.Text);
                cmd.Parameters.AddWithValue("@ename", updatel2.Text);
                cmd.Parameters.AddWithValue("@job", updatel3.Text);
                cmd.ExecuteNonQuery();
                griddelete.EditIndex = -1;
               
                lblmsg.Text = "Data Updated successfully";
                bind();
                
            }

        }