以下程式碼，透過 button1 控制項 Click 事件執行 ShowWindow() 方法，控制外部程式視窗狀態：包含最大化、最小化、縮到工具列、復原 等動作。
控制外部程序，請參考 Process 類別。
程式碼：
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using System;
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using System.Diagnostics;
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using System.Runtime.InteropServices; // to import Dll
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using System.Windows.Forms;
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namespace WordTest
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{
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public partial class Form1 : Form
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{
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public Form1( )
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{
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InitializeComponent( );
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}
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[DllImport( "User32" ) ]
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private static extern int ShowWindow( int hwnd, int nCmdShow);
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private enum CommandShow : int
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{
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SW_HIDE = 0,
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SW_SHOWNORMAL = 1,
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SW_NORMAL = 1,
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SW_SHOWMINIMIZED = 2,
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SW_SHOWMAXIMIZED = 3,
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SW_MAXIMIZE = 3,
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SW_SHOWNOACTIVATE = 4,
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SW_SHOW = 5,
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SW_MINIMIZE = 6,
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SW_SHOWMINNOACTIVE = 7,
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SW_SHOWNA = 8,
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SW_RESTORE = 9,
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SW_SHOWDEFAULT = 10,
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SW_FORCEMINIMIZE = 11,
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SW_MAX = 11
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} ;
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private static void button1_Click( object sender, EventArgs e)
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{
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Process[ ] p = Process.GetProcessesByName ( "notepad" );
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if (p.Length > 0 )
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{
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int hwnd;
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hwnd = p[ 0 ].MainWindowHandle.ToInt32 ( );
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ShowWindow(hwnd, ( int ) CommandShow.SW_RESTORE );
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}
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}
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}
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}
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