1 files changed, 23 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/CharSet.cs b/src/mscorlib/src/System/Runtime/InteropServices/CharSet.cs
new file mode 100644
index 0000000000..6e4e99bdf5
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/CharSet.cs
@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+namespace System.Runtime.InteropServices {
+    using System;
+    // Use this in P/Direct function prototypes to specify 
+    // which character set to use when marshalling Strings.
+    // Using Ansi will marshal the strings as 1 byte char*'s.
+    // Using Unicode will marshal the strings as 2 byte wchar*'s.
+    // Generally you probably want to use Auto, which does the
+    // right thing 99% of the time.
+    [Serializable] 
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum CharSet
+    {
+        None = 1,        // User didn't specify how to marshal strings.
+        Ansi = 2,        // Strings should be marshalled as ANSI 1 byte chars. 
+        Unicode = 3,    // Strings should be marshalled as Unicode 2 byte chars.
+        Auto = 4,        // Marshal Strings in the right way for the target system. 
+    }
+}