protected void Button1_Click(object sender, EventArgs e)
        {
            RequestRetrieveAttendanceRecords request = new RequestRetrieveAttendanceRecords();

            request.Username = txtUsername.Text;
            DataTable dt = DAT.RetrieveDTR(request);

            GridViewDTR.DataSource = dt;
            GridViewDTR.DataBind();
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            RequestRetrieveAttendanceRecords request = new RequestRetrieveAttendanceRecords();

            request.Username = Session["Username"].ToString();
            DataTable dt = DAT.RetrieveDTR(request);

            GridViewDTR.DataSource = dt;
            GridViewDTR.DataBind();
        }