Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.ApplicationServices/Security/MembershipProviderCollection.cs

@@ -0,0 +1,40 @@
+//------------------------------------------------------------------------------
+// <copyright file="MembershipProviderCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Security {
+
+    using System;
+    using System.Configuration.Provider;
+    using System.Globalization;
+    using System.Runtime.CompilerServices;
+
+    // This has no hosting permission demands because of DevDiv Bugs 31461: ClientAppSvcs: ASP.net Provider support
+    [TypeForwardedFrom("System.Web, Version=2.0.0.0, Culture=Neutral, PublicKeyToken=b03f5f7f11d50a3a")]
+    public sealed class MembershipProviderCollection : ProviderCollection {
+
+        public override void Add(ProviderBase provider) {
+            if (provider == null) {
+                throw new ArgumentNullException("provider");
+            }
+
+            if (!(provider is MembershipProvider)) {
+                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, ApplicationServicesStrings.Provider_must_implement_type, typeof(MembershipProvider).ToString()), "provider");
+            }
+
+            base.Add(provider);
+        }
+
+        new public MembershipProvider this[string name] {
+            get {
+                return (MembershipProvider)base[name];
+            }
+        }
+
+        public void CopyTo(MembershipProvider[] array, int index) {
+            base.CopyTo(array, index);
+        }
+    }
+}