Create a Visual Studio solution that contains both the WCF client and WCF service projects.
In Solution Explorer, right-click the WCF Client project and then click Set as Startup Project.
Enable debugging in the app.config or web.config file. For more information, see Limitations on WCF Debugging.
Set a breakpoint at the location in the client project where you want to start stepping. Typically, this will be just before the WCF service call.
Run to the breakpoint, then begin stepping. The debugger will step into the service automatically.
There are limitation while debudding wcf service. Refer this linkhttp://msdn.microsoft.com/en-us/library/bb157687.aspx Skkanagaraj, if this helps please login to Mark As Answer. | Alert Moderator