สอบถามปัญหา no valid report source is available แก้ยังไงคะ ใน Web ( ASP.Net)+VB.NET ตอนที่ Next page ในหน้า crystal Report คะ

       if (IsPostBack)
        {
            try
            {
                CrystalReportViewer1.ReportSource = (ReportDocument)Session["Report"];
                CrystalReportViewer1.RefreshReport();
                CrystalReportViewer1.DataBind();
            }
            catch (Exception ex)
            {

               // throw;
            } 
        }

private void reportLogin()
{
	ReportDocument cryRpt = new ReportDocument();
	TableLogOnInfos crtableLogoninfos = new TableLogOnInfos();
	TableLogOnInfo crtableLogoninfo = new TableLogOnInfo();
	ConnectionInfo crConnectionInfo = new ConnectionInfo();
	Tables CrTables ;

	cryRpt.Load("PUT CRYSTAL REPORT PATH HERE\CrystalReport1.rpt");

	crConnectionInfo.ServerName = "YOUR SERVER NAME";
	crConnectionInfo.DatabaseName = "YOUR DATABASE NAME";
	crConnectionInfo.UserID = "YOUR DATABASE USERNAME";
	crConnectionInfo.Password = "YOUR DATABASE PASSWORD";

	CrTables = cryRpt.Database.Tables ;
	foreach (CrystalDecisions.CrystalReports.Engine.Table CrTable in CrTables)
	{
		crtableLogoninfo = CrTable.LogOnInfo;
		crtableLogoninfo.ConnectionInfo = crConnectionInfo;
		CrTable.ApplyLogOnInfo(crtableLogoninfo);
	}

	crystalReportViewer1.ReportSource = cryRpt;
	crystalReportViewer1.Refresh();   
}