I have remote object that writes a DataSet to an ASP.NET host application.
The remote object used a class to do the writing. With the permissions set
properly everything worked fine until I decided to make this class a
serviced component to take advantage of some COM+ features. Now I get a
runtime error in the method used to write the DataSet. The same method was
performing the task successfully prior to making the class a COM+ component.

Here is what the method of the serviced component does:

public bool PersistData(DataSet ds, string filePath)

{

   //...

    ds.WriteXml(filePath, XmlWriteMode.WriteSchema);

   //...

}

and here is the output:

[top of Call Stack]

mscorlib.dll!System.Runtime.Remoting.Proxies.RealProxy::HandleReturnMessage(
System.Runtime.Remoting.Messaging.IMessage reqMsg =
{System.Runtime.Remoting.Messaging.Message},
System.Runtime.Remoting.Messaging.IMessage retMsg =
{System.Runtime.Remoting.Messaging.MethodResponse}) + 0x90 bytes

[Output]

An unhandled exception of type 'System.Runtime.Remoting.RemotingException'
occurred in mscorlib.dll

Additional information: The argument type System.Data.DataSet cannot be
converted into parameter type System.Data.DataSet.

Any idea on what the problem could be?

TIA