I am using visual studio 2010, my application has a multiu layer architect,
MainUI, WCFService, BLL and DAL
My MainUI communicated to WCF and WCF further commun
Have you tried System.Diagnostics.Debugger.Launch() in your service you would like the debugger to attach to? http://msdn.microsoft.com/en-us/library/system.diagnostics.debugger.launch.aspx
System.Diagnostics.Debugger.Launch()