You cannot do this, unfortunately.
But instead, you get a WCF test client !
It is available from your catalog C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\, and it is a GUI tool for connecting to WCF services and testing them interactively. Very comfortably.
WCF "" , . , , - ASMX.
- WCF Storm ( .NET) SoapUI ( Java) SOAP-.