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diff --git a/src/mscorlib/src/System/IO/SearchOption.cs b/src/mscorlib/src/System/IO/SearchOption.cs
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+++ b/src/mscorlib/src/System/IO/SearchOption.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================
+**
+** Enum:   SearchOption
+** 
+** 
+**
+**
+** Purpose: Enum describing whether the search operation should  
+** retrieve files/directories from the current directory alone  
+** or should include all the subdirectories also.
+**
+**
+===========================================================*/
+
+using System;
+
+namespace System.IO {
+    [Serializable]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum SearchOption
+    {
+        // Include only the current directory in the search operation
+        TopDirectoryOnly,
+
+        // Include the current directory and all the sub-directories
+        // underneath it including reparse points in the search operation. 
+        // This will traverse reparse points (i.e, mounted points and symbolic links)
+        // recursively. If the directory structure searched contains a loop
+        // because of hard links, the search operation will go on for ever. 
+        AllDirectories,
+    }
+}