How to minimize/maximize opened Applications

You can use findwindowbycaption to get the handle then maximize or minimize with showwindow

private const int SW_MAXIMIZE = 3;
private const int SW_MINIMIZE = 6;
// more here: http://www.pinvoke.net/default.aspx/user32.showwindow

[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

Then in your code you use this:

IntPtr hwnd = FindWindowByCaption(IntPtr.Zero, "The window title");
ShowWindow(hwnd, SW_MAXIMIZE);

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Although it seems you already have the window handle by using EnumWindows in that case you would only need:

ShowWindow(windows[i].handle, SW_MAXIMIZE);

i is the index of the window.

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to close the window you will use:

[DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError=true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool DestroyWindow(IntPtr hwnd);

in the code:

DestroyWindow(hwnd) //or DestroyWindow(windows[i].handle)

this is the unmanaged version of system.windows.forms.form.close()

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or you can use:

Process [] proc Process.GetProcessesByName("process name");
proc[0].Kill();

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or you can use:

static uint WM_CLOSE = 0x0010;
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

in code:

PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

you can use ShowWindowAsync

private const int SW_SHOWNORMAL = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;

[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);


ShowWindowAsync(wnd.Handle, SW_SHOWMINIMIZED );

and it's better and to use

    var openWindows = Process.GetProcesses().Where(process=> String.IsNullOrEmpty(process.MainWindowTitle)==false);

to get opened windows

I have test MainWindowTitle in Porcess and it helps to search on window given it's caption.

 var handles = Process.GetProcesses().Where(x => x.MainWindowTitle == "Untitled - Notepad").Select(y=>y.Handle).ToList();

You may use native method ShowWindow with SW_MAXIMIZE, SW_MINIMIZE for ncmdShow Take a look at http://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx

private const int SW_MAXIMIZE = 3;
private const int SW_MINIMIZE = 6;

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);


// in your code
ShowWindow(wnd.Handle, SW_MAXIMIZE);