Crystal Report Load Fail In ASP.Net - 2010

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ASP.NET

CrystalReports

Hi..Please Give me solution.
I am working on page load event perfectly CrystalReports wrok but same code apply on button click event then display error."Load report failed.".
Load Event Code..

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

       If Not IsPostBack Then

           Dim dt As New DataTable
           adp = New SqlDataAdapter("SELECT  * FROM Employee", con)
           Dim ds As New DataSet
           adp.Fill(dt)
           Dim crystalRepo As New ReportDocument()
           crystalRepo.Load(Server.MapPath("~/Test.rpt"))
           crystalRepo.SetDataSource(dt)
           CrystalReportViewer1.ReportSource = crystalRepo


       End If
   End Sub

Button Click Eevent.

Protected Sub btnSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearch.Click

        Dim dt As New DataTable
        adp = New SqlDataAdapter("SELECT  * FROM Employee", con)
        Dim ds As New DataSet
        adp.Fill(dt)
        Dim crystalRepo As New ReportDocument()
        crystalRepo.Load(Server.MapPath("~/Test.rpt"))
        crystalRepo.SetDataSource(dt)
        CrystalReportViewer1.ReportSource = crystalRepo
End If
    End Sub