Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Mobile/UI/MobileControls/UniqueSet.cs

@@ -0,0 +1,42 @@
+//------------------------------------------------------------------------------
+// <copyright file="UniqueSet.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+using System;
+using System.Collections;
+using System.Diagnostics;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+using System.Web.UI.HtmlControls;
+
+namespace System.Web.UI.MobileControls
+{
+    /*
+     * UniqueSet class. An array of objects that are unique.
+     *
+     * Copyright (c) 2000 Microsoft Corporation
+     */
+
+    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
+    internal sealed class UniqueSet : ArrayList
+    {
+        internal UniqueSet() {
+        }
+
+        public override int Add(Object o)
+        {
+            if (!Contains(o))
+            {
+                return base.Add(o);
+            }
+            else
+            {
+                return -1;
+            }
+        }
+    }
+}
+