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diff --git a/print/v4PrintDriverSamples/PrinterExtensionSample/ExtensionSample/WindowHelper.cs b/print/v4PrintDriverSamples/PrinterExtensionSample/ExtensionSample/WindowHelper.cs
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+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved
+//
+//
+// Abstract:
+//
+//     This file contains helper methods that provide a friendly way to access win32 window functions.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Microsoft.Samples.Printing.PrinterExtension.Helpers
+{
+    class WindowHelper
+    {
+        /// <summary>
+        /// P/Invoke signature for Win32 function "SetForegroundWindow".
+        /// </summary>
+        /// <param name="hwnd">Handle to window</param>
+        [return: MarshalAs(UnmanagedType.Bool)]
+        [DllImport("User32", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
+        public static extern bool SetForegroundWindow(IntPtr hwnd);
+
+        /// <summary>
+        /// Wrapper for Win32 function "FlashWindowEx"
+        /// </summary>
+        /// <param name="hWnd">Handle of the window to flash</param>
+        public static bool FlashWindow(IntPtr hWnd)
+        {
+            FLASHWINFO fInfo = new FLASHWINFO();
+
+            fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo));
+            fInfo.hwnd = hWnd;                              // Handle to window
+            fInfo.uCount = UInt32.MaxValue;                 // Number of times to flash
+            fInfo.dwTimeout = 0;                            // Use default cursor blink rate
+            // Flash both window caption and taskbar button, until the window is brought to the foreground.
+            fInfo.dwFlags = (uint)(FLASHW.ALL | FLASHW.TIMERNOFG);
+
+            return FlashWindowEx(ref fInfo);
+        }
+
+        #region private members
+
+        /// <summary>
+        /// P/Invoke signature for Win32 function "FlashWindowEx".
+        /// </summary>
+        [return: MarshalAs(UnmanagedType.Bool)]
+        [DllImport("User32", CharSet = CharSet.Auto, SetLastError = false, ExactSpelling = true)]
+        private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct FLASHWINFO
+        {
+            public UInt32 cbSize;
+            public IntPtr hwnd;
+            public UInt32 dwFlags;
+            public UInt32 uCount;
+            public UInt32 dwTimeout;
+        }
+
+        /// <summary>
+        /// Represents the FLASH_Xxx flags
+        /// </summary>
+        [Flags]
+        private enum FLASHW : uint
+        {
+            /// <summary>
+            /// Flash both the window caption and taskbar button
+            /// </summary>
+            ALL = 3,
+            /// <summary>
+            /// Flash continuously until the window comes to the foreground.
+            /// </summary>
+            TIMERNOFG = 12
+        }
+
+        #endregion
+    }
+}