Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/aspnetwebstack/src/System.Web.Mvc/ModelErrorCollection.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
+
+using System.Collections.ObjectModel;
+
+namespace System.Web.Mvc
+{
+    [Serializable]
+    public class ModelErrorCollection : Collection<ModelError>
+    {
+        public void Add(Exception exception)
+        {
+            Add(new ModelError(exception));
+        }
+
+        public void Add(string errorMessage)
+        {
+            Add(new ModelError(errorMessage));
+        }
+    }
+}