Crystal report is not loading in crystal report viewer . please help here

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VB

ASP.NET

CrystalReports

I have created a report and trying to load to my web form

<td>



               <CR:CrystalReportViewer ID="CrystalReportViewer1"  runat="server"
                   AutoDataBind="True" GroupTreeImagesFolderUrl="" Height="1202px"
                   ReportSourceID="CrystalReportSource1" ToolbarImagesFolderUrl=""
                   ToolPanelWidth="200px" Width="1104px" />
               <CR:CrystalReportSource ID="CrystalReportSource1"  runat="server">
                   <Report FileName="Gp.rpt">
                   </Report>
               </CR:CrystalReportSource>
               </td>

in button click I am trying to set data source .

Dim dt As New DataTable
        startDate = txtStart.Text.Trim()
        endDate = txtEnd.Text.Trim()
        dt = BO.GenerateGrossProfit(startDate, endDate)

        Dim rptA As ReportDocument = New ReportDocument()


        '//
        Dim str As String = ""
        Dim ds As New DataSet
        str = "Select ID,BRANCHCODE from Report_HDR_History"
        ds = DL.ExecuteNonQueryforGP(str)
        rptA.Load(Server.MapPath("") & "/Gp.rpt")
        rptA.FileName = Server.MapPath("/Gp.rpt")
        rptA.SetDataSource(ds.Tables(0))
        rptA.SetDatabaseLogon("SMUSER", "SMUser@123")
        CrystalReportViewer1.DisplayToolbar = True
        CrystalReportViewer1.ReportSource = rptA
        CrystalReportViewer1.DataBind()
        CrystalReportViewer1.RefreshReport()

No error is showing but my report viewer no data ..

please help here my development now in stuck ..