using System.Diagnostics;
using System.Threading;

public partial class CHOPPA
{

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private Thread thrTyping;

private void startThread()
{
    ThreadStart ts = new ThreadStart(sendKeys);
    thrTyping = new Thread(ts);
    thrTyping.Start();
}

private void sendKeys()
{
    while (condition)
    {
        //find and bring the application i need to focus
        Process[] processes = Process.GetProcessesByName("App_Name");
        foreach (Process proc in processes)
        {
            SetForegroundWindow(proc.MainWindowHandle);
        }

        //sleep the thread before I send it the keys for at least 1 second
        Thread.Sleep(1000);
        SendKeys.SendWait("{F4}");
    }
}
}