Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Web.Mvc3/Mvc/UrlParameter.cs

@@ -0,0 +1,17 @@
+namespace System.Web.Mvc {
+    using System;
+    using System.Diagnostics.CodeAnalysis;
+
+    public sealed class UrlParameter {
+
+        [SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "This type is immutable.")]
+        public static readonly UrlParameter Optional = new UrlParameter();
+
+        // singleton constructor
+        private UrlParameter() { }
+
+        public override string ToString() {
+            return String.Empty;
+        }
+    }
+}