Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/IStateFormatter2.cs

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+//------------------------------------------------------------------------------
+// <copyright file="IStateFormatter2.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    using System;
+    using System.Web.Security.Cryptography;
+
+    // Similar to IStateFormatter, but also accepts a Purpose object to control cryptographic
+    // operations during serialization / deserialization. Internal since we don't publicly
+    // expose Purpose objects.
+
+    internal interface IStateFormatter2 : IStateFormatter {
+
+        object Deserialize(string serializedState, Purpose purpose);
+
+        string Serialize(object state, Purpose purpose);
+
+    }
+}