c# .net & RPCs

Hey guys I have a problem maybe you can help me with. I'm currently rewriting a utility for my company that gets shipping rates from our main carries. I'm of course using their web services api via a RPC("Remote Procedure Call"). I'm trying to find a way to let the user know the program is working on their request. I have tried using progress bars, wait cursor, and other GUI cues for system processing. They all just lock up until the RPC is done. Any help would be appreciated in advance.

by maxiums via /r/csharp

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