public static string GetKeyDownString(KeyEventArgs args)
{
    var value = "";

    if ((Keyboard.Modifiers & ModifierKeys.Control) > 0)
    {
        value += "Ctrl+";
    }

    if ((Keyboard.Modifiers & ModifierKeys.Alt) > 0)
    {
        value += "Alt+";
    }

    if ((Keyboard.Modifiers & ModifierKeys.Shift) > 0)
    {
        value += "Shift+";
    }

    if ((Keyboard.Modifiers & ModifierKeys.Alt) > 0)
    {
        return value + args.SystemKey;
    }
    else
    {
        return value + args.Key;
    }
}