Using [NotNull] from the common repo package

src/Microsoft.AspNet.Session/DistributedSession.cs

@@ -8,6 +8,7 @@ using System.Linq;
 using System.Text;
 using Microsoft.AspNet.Http;
 using Microsoft.Framework.Caching.Distributed;
+using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 
 namespace Microsoft.AspNet.Session

src/Microsoft.AspNet.Session/DistributedSessionStore.cs

@@ -4,6 +4,7 @@
 using System;
 using Microsoft.AspNet.Http;
 using Microsoft.Framework.Caching.Distributed;
+using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 
 namespace Microsoft.AspNet.Session

src/Microsoft.AspNet.Session/NotNullAttribute.cs

@@ -1,12 +0,0 @@
-// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-
-namespace Microsoft.AspNet.Session
-{
-    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
-    internal sealed class NotNullAttribute : Attribute
-    {
-    }
-}

src/Microsoft.AspNet.Session/SessionFactory.cs

@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNet.Http;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Session
 {

src/Microsoft.AspNet.Session/SessionMiddleware.cs

@@ -8,6 +8,7 @@ using System.Security.Cryptography;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
+using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 using Microsoft.Framework.OptionsModel;
 

src/Microsoft.AspNet.Session/SessionMiddlewareExtensions.cs

@@ -6,6 +6,7 @@ using Microsoft.AspNet.Session;
 using Microsoft.Framework.Caching.Distributed;
 using Microsoft.Framework.Caching.Memory;
 using Microsoft.Framework.DependencyInjection;
+using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 using Microsoft.Framework.OptionsModel;
 

src/Microsoft.AspNet.Session/SessionServiceCollectionExtensions.cs

@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNet.Session;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.Framework.DependencyInjection
 {

src/Microsoft.AspNet.Session/project.json

@@ -5,7 +5,8 @@
         "Microsoft.AspNet.Http.Extensions": "1.0.0-*",
         "Microsoft.AspNet.Http.Interfaces": "1.0.0-*",
         "Microsoft.Framework.Caching.Distributed": "1.0.0-*",
-        "Microsoft.Framework.Logging.Interfaces": "1.0.0-*"
+        "Microsoft.Framework.Logging.Interfaces": "1.0.0-*",
+        "Microsoft.Framework.NotNullAttribute.Internal": { "type": "build", "version": "1.0.0-*" }
     },
     "compilationOptions": {
         "allowUnsafe": true