Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/OSVersion.cs

@@ -0,0 +1,49 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace System.ServiceModel
+{
+    enum OSVersion
+    {
+        /// <summary>
+        /// Used when unable to determine the OS Version
+        /// </summary>
+        Unknown,
+
+        /// <summary>
+        /// OS Versions before WinXP
+        /// </summary>
+        PreWinXP,
+
+        /// <summary>
+        /// OS Version - Windows XP
+        /// </summary>
+        WinXP,
+
+        /// <summary>
+        /// OS Version - Windows Server 2003 
+        /// </summary>
+        Win2003,
+
+        /// <summary>
+        /// OS Version - Windows Vista
+        /// </summary>
+        WinVista,
+
+        /// <summary>
+        /// OS Version - Windows 7
+        /// </summary>
+        Win7,
+
+        /// <summary>
+        /// OS Version - Windows 8
+        /// </summary>
+        Win8,
+
+        /// <summary>
+        /// OS Versions after Windows 8
+        /// </summary>
+        PostWin8,        
+    }
+}