Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,60 @@
+//------------------------------------------------------------------------------
+// <copyright file="IStateManager.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * Interface implemented by objects that support state management.
+ *
+ * Copyright (c) 1999 Microsoft Corporation
+ */
+namespace System.Web.UI {
+
+/// <devdoc>
+///    <para>Defines the contract that controls must implement to support state 
+///       management.</para>
+/// </devdoc>
+public interface IStateManager {
+    /*
+     * Return true if tracking state changes.
+     */
+
+    /// <devdoc>
+    ///    <para>Determines if state changes are being tracked.</para>
+    ///    </devdoc>
+    bool IsTrackingViewState {
+        get;
+    }
+    
+    /*
+     * Load previously saved state.
+     */
+
+    /// <devdoc>
+    ///    <para>Loads the specified control's previously saved state.</para>
+    ///    </devdoc>
+    void LoadViewState(object state);
+
+    /*
+     * Return object containing state changes.
+     */
+
+    /// <devdoc>
+    ///    <para>Returns the object that contains the state changes.</para>
+    ///    </devdoc>
+    object SaveViewState();
+
+    /*
+     * Start tracking state changes.
+     */
+
+    /// <devdoc>
+    ///    <para>Instructs the control to start tracking changes in state.</para>
+    ///    </devdoc>
+    void TrackViewState();
+
+
+}
+
+}