public void PopulateExam()
        {
            var userId = HttpContext.Current.User.Identity.GetUserId();
            var school = DropDownManager.GetSchoolByUserId(userId);

            if (school != null)
            {
                lblSchoolId.Text   = school.Id.ToString();
                lblSchoolType.Text = school.SchoolTypeId.ToString();
                lblSchoolCat.Text  = school.CategoryId.ToString();
                string catId = school.CategoryId.ToString();

                var dt = new DataTable();
                dt.Columns.Add("SN");
                dt.Columns.Add("ID");
                dt.Columns.Add("EXAM");
                dt.Columns.Add("EXAMCODE");
                dt.Columns.Add("FEE");

                var Exams = DropDownManager.GetExaminations(catId);
                int sn    = 0;
                foreach (var item in Exams)
                {
                    string examId     = item.ExamId.ToString();
                    string examName   = item.Name.ToString();
                    string examCode   = item.ExamCode.ToString();
                    string examFee    = item.Fee.ToString();
                    string examStatus = item.Activated.ToString();
                    sn++;
                    dt.Rows.Add(sn, examId, examName, examCode, examFee);
                }
                gvExam.DataSource = dt;
                gvExam.DataBind();
            }
        }