code problem

i have put the following code under the code section to get the multi value.

Public Function ShowParameterValues(ByVal parameter As Parameter) As String
Dim s As String
If parameter.IsMultiValue Then
s = "Multivalue: "
For i As Integer = 0 To parameter.Count - 1
s = s + CStr(parameter.Value(i)) + " "
Next
Else
s = "Single value: " + CStr(parameter.Value)
End If
Return s
End Function

then i called that using =Code.ShowParameterValues(Parameters!BU). it gives error. what is the reason?

I wished I could help. Your code is working for me. .NET Framework problems?|||i dont have this reference. where can i download this reference?

Microsoft.ReportingServices.ReportProcessing.ReportObjectModel.Parameters