Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel.Internals/System/Runtime/NameGenerator.cs

@@ -0,0 +1,29 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Runtime
+{
+    using System;
+    using System.Globalization;
+    using System.Threading;
+
+    class NameGenerator
+    {
+
+        static NameGenerator nameGenerator = new NameGenerator();
+        long id;
+        string prefix;
+
+        NameGenerator()
+        {
+            this.prefix = string.Concat("_", Guid.NewGuid().ToString().Replace('-', '_'), "_");
+        }
+
+        public static string Next()
+        {
+            long nextId = Interlocked.Increment(ref nameGenerator.id);
+            return nameGenerator.prefix + nextId.ToString(CultureInfo.InvariantCulture);
+        }
+    }
+}