//Edit Subject public void editSubject(long id) { try { ViewState["id"] = id; Exam Emodel = new Exam(); Emodel.subjectID = id; Emodel.classID = Convert.ToInt64(ddlClasses.SelectedValue); Exam Subject = Edal.editSubject(Emodel); ddlClasses.SelectedValue = Subject.classID.ToString(); txtSubject.Text = Subject.subjectName; btnSubmit.Visible = false; btnUpdate.Visible = true; } catch (Exception ex) { lblError.Visible = true; lblSuccess.Visible = false; lblError.Text = ex.ToString(); } }