Alternative to "SendKeys.Send" Method in WPF application

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C++

WPF

Please tell me the classes and methods I need to call when working in WPF. I tried with the following as someone suggested in http://stackoverflow.com/questions/17917447/wpf-send-keycode-to-active-application

HOWEVER, THIS DIDN'T WORK OUT WHILE WORKING IN VS 2012 and .NET 4.0.

public partial class MainWindow : Window
{
    [DllImport("user32.dll", EntryPoint="FindWindow", SetLastError = true)]
    static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool SetForegroundWindow(IntPtr hWnd);

    public MainWindow()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        SetForegroundWindow(FindWindowByCaption(IntPtr.Zero, "Untitled - Notepad"));
        SendKeys.SendWait("A");
    }