private void LoadData()
{
string sFrom = Request.QueryString["datefrom"].ToString();
string sTo = Request.QueryString["dateto"].ToString();
lblDateFrom.Text = sFrom;
lblDateTo.Text = sTo;
InvoiceDetails obj = new InvoiceDetails();
DataTable dtb = new DataTable();
dtb = obj.ReportbyDate_2(sFrom, sTo);
rptProduct.DataSource = dtb;
rptProduct.DataBind();
}