Desktop anzeigen (alle Fenster minimieren)

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private void MinimizeAll()
{
    Type typeShell = Type.GetTypeFromProgID("Shell.Application");
    object objShell = Activator.CreateInstance(typeShell);
    typeShell.InvokeMember("MinimizeAll", System.Reflection.BindingFlags.InvokeMethod, null, objShell, null); 
}

private void UndoMinimizeAll()
{
    Type typeShell = Type.GetTypeFromProgID("Shell.Application");
    object objShell=Activator.CreateInstance(typeShell);
    typeShell.InvokeMember("UndoMinimizeAll",System.Reflection.BindingFlags.InvokeMethod,null,objShell,null); 
}