Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/CollectionChangeAction.cs

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+//------------------------------------------------------------------------------
+// <copyright file="CollectionChangeAction.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.ComponentModel {
+    using System.ComponentModel;
+
+    using System.Diagnostics;
+
+    using System;
+
+    /// <devdoc>
+    ///    <para>Specifies how the collection is changed.</para>
+    /// </devdoc>
+    public enum CollectionChangeAction {
+        /// <devdoc>
+        ///    <para> Specifies that an element is added to the collection.</para>
+        /// </devdoc>
+        Add = 1,
+
+        /// <devdoc>
+        ///    <para>Specifies that an element is removed from the collection.</para>
+        /// </devdoc>
+        Remove = 2,
+
+        /// <devdoc>
+        ///    <para>Specifies that the entire collection has changed.</para>
+        /// </devdoc>
+        Refresh = 3
+    }
+}