private void DataBind()
        {
            int studentId = Convert.ToInt32(Session["Student_StudentID"]);
            OpportunityRegistered        opportunityRegistered = new OpportunityRegistered();
            List <OpportunityRegistered> result = opportunityRegistered.GetOpportunityRegisteredByStudentId(studentId);
            StudentHours studenthours           = new StudentHours();

            for (int i = 0; i < result.Count; i++)
            {
                StudentHours hours = studenthours.GetVolunteeredAndPartnerApprovedHours(result[i].StudentId, result[i].OpportunityID);
                result[i].HoursVolunteered = hours.HoursVolunteered + " / " + hours.PartnerApprovedHours;
            }

            Quarter quarter        = new Quarter();
            string  currentQuarter = quarter.GetCurrentQuarterName();
            string  filterItem     = DropDownList1.SelectedItem.Text;

            if (filterItem == "Current")
            {
                for (int i = 0; i < result.Count; i++)
                {
                    if (result[i].Quarter != currentQuarter)
                    {
                        result.Remove(result[i]);
                    }
                }
            }

            if (result.Count == 0)
            {
                OpportunityRegistered oppS = new OpportunityRegistered();
                result.Add(oppS);
                gvOpportunity.DataSource = result;
                gvOpportunity.DataBind();
                gvOpportunity.Rows[0].Visible = false;
            }
            else
            {
                gvOpportunity.DataSource = result;
                gvOpportunity.DataBind();
            }
        }