Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

external/referencesource/System.Configuration/System/Configuration/ConfigurationSaveMode.cs

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+//------------------------------------------------------------------------------
+// <copyright file="ConfigurationSaveMode.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+using ClassConfiguration = System.Configuration.Configuration;
+using System.Collections;
+using System.Configuration;
+using System.Configuration.Internal;
+using System.IO;
+using System.Reflection;
+using System.Security;
+using System.Security.Permissions;
+using System.Threading;
+
+namespace System.Configuration {
+
+    // Determines how much of configuration is written out on save.
+    public enum ConfigurationSaveMode {
+        // If a setting is modified, it'll get written no matter it's
+        // same as the parent or not.
+        Modified = 0,
+
+        // If a setting is the same as in its parent, it won't get written
+        Minimal  = 1,
+
+        // It writes out all the properties in the configurationat that level,
+        // including the one from the parents.  Used for writing out the
+        // full config settings at a file.
+        Full     = 2,
+    }
+}
+