use extended methode

Author: Lempireqc

Diff for: GraphDiff/GraphDiff/Internal/Graph/GraphNode.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Data.Entity;
 using System.Data.Entity.Core;
@@ -214,7 +214,7 @@ private static void EnsureConcurrency<T>(IObjectContextAdapter db, T entity1, T
             var entityType = ObjectContext.GetObjectType(entity1.GetType());
             var metadata = db.ObjectContext.MetadataWorkspace;
 
-            var objType = metadata.GetItems<EntityType>(DataSpace.OSpace).Single(p => p.FullName == entityType.FullName);
+            var objType = metadata.GetEntityTypeByType(entityType);
 
             // need internal string, code smells bad.. any better way to do this?
             var cTypeName = (string)objType.GetType()