//Update Subject public void updateSubject() { try { Exam eModel = new Exam(); eModel.subjectName = txtSubject.Text; eModel.classID = Convert.ToInt64(ddlClasses.SelectedValue); eModel.subjectID = Convert.ToInt64(ViewState["id"]); string message = Edal.updateSubject(eModel); if (message.Contains("successfully")) { lblSuccess.Text = message; lblError.Visible = false; lblSuccess.Visible = true; txtSubject.Text = ""; getSubjects(); } btnSubmit.Visible = true; btnUpdate.Visible = false; txtSubject.Text = ""; txtSubject.Focus(); } catch (Exception ex) { lblError.Visible = true; lblSuccess.Visible = false; lblError.Text = ex.ToString(); } }