I have created a custom assembly to display the parameter names using the GetReportParameters method. The parameters show through the preview screen in reporting services, but as soon as I deploy it and view the report through Report Manager it shows '#Error'.
What can I do? Any Help?

Thank You

When I run my report through 'DebugLocal' mode.
it breaks here:

Public Class ParameterList

    Public Shared Function GetParameterNames()
        Dim rs As New ReportingService
        rs.Credentials = System.Net.CredentialCache.DefaultCredentials:(
        Dim report As String = "/Commission Reports/Detailed Broker Commission Bordereaux"
        Dim forRendering As Boolean = False
        Dim historyID As String = Nothing
        Dim values As ParameterValue() = Nothing
        Dim credentials As DataSourceCredentials() = Nothing
        Dim strParam As String = ""


        Dim Parameters() As ReportParameter
        Parameters = rs.GetReportParameters(report, historyID, forRendering, values, credentials)

        If Not (Parameters Is Nothing) Then
            Dim rp As ReportParameter
            For Each rp In Parameters
                strParam = rp.Prompt & strParam
            Next rp
        End If
        Return strParam
    End Function

End Class

The message reads :

"Request for the permission of type 'System.Security.Permissions.EnvironmentPermission ,
mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."

Any help would be appreciated

Thanks