Hi,Everybody

Can somebody help me find out what 's wrong with the code?
Can I pass a .NET type as a parameter to another .NET type's method? or how?

see below:
=================================================
.NET Server C# code:
namespace XYZ.BusinessLogic
{
public class Document

 public void Update(XYZ.Model.DocumentInfo docInfo,int userid)
 {
       ...
 }
}
----------------------------------
ASP Client VBScript Code:
Set Doc=Server.CreateObject("XYZ.BusinessLogic.Document")
Set DocInfo=Server.CreateObject("XYZ.Model.DocumentInfo")
UserID=1
DocInfo.Title="Test"
...
Doc.Update DocInfo,UserID
-----------------------------------
Error Message I got after I run the asp page:
Error Type:
Microsoft VBScript runtime (0x800A0005)
Invalid procedure call or argument: 'Doc.Update'
==================================================

Thank in advance

Lidong