Remoting Error

Question

When i call a method on the Remote object asynchronously and the remote object is not available, a System.Net.WebException is thrown which i am not able to catch. When i call the method on the remote object i pass the address of all the callback function. I wrote Try ....Catch blocks in both the places i.e. where i call the method on the remote object and in the callback function. When the remote object is not available the exception is generated and it says there is no source code available for it. any sort of help will be highly grateful