//Delete Subject public void deleteSubject(long id) { try { string message = Edal.deleteSubject(id); getSubjects(); lblError.Visible = true; lblSuccess.Visible = false; lblError.Text = message; txtSubject.Text = ""; ddlClasses.SelectedIndex = -1; } catch (Exception ex) { lblError.Visible = true; lblSuccess.Visible = false; lblError.Text = ex.ToString(); } }