Cef.Shutdown - Improve Thread Check error message

Author: amaitland

CefSharp.Core/Cef.h

@@ -420,7 +420,10 @@ namespace CefSharp
                 {
                     if (_initializedThreadId != Thread::CurrentThread->ManagedThreadId)
                     {
-                        throw gcnew Exception("Shutdown must be called on the same thread that Initialize was called - typically your UI thread. CefSharp was initialized on ManagedThreadId: " + Thread::CurrentThread->ManagedThreadId);
+                        throw gcnew Exception("Cef.Shutdown must be called on the same thread that Cef.Initialize was called - typically your UI thread." +
+							"If you called Cef.Initialize on a Thread other than the UI thread then you will need to call Cef.Shutdown on the same thread." +
+							"Cef.Initialize was called on ManagedThreadId: " + _initializedThreadId + "where Cef.Shutdown is being called on" +
+							"ManagedThreadId:" + Thread::CurrentThread->ManagedThreadId);
                     }
 
                     UIThreadTaskFactory = nullptr;