Getting window titles in the service

while (true)
{
    Thread.Sleep(1000); //Because of high CPU.
    foreach (Process currentProcess in Process.GetProcesses())
    {
        if (currentProcess.MainWindowTitle.Contains("Something"))
        {
            //Window has been found.
        }
    }
}

//Dll imports:
[DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Ansi)]
private static extern IntPtr FindWindow(string className, string windowName);
[DllImport("user32.dll", EntryPoint = "GetWindowText", CharSet = CharSet.Ansi)]
private static extern bool GetWindowText(IntPtr hWnd, [OutAttribute()] StringBuilder strNewWindowName, Int32 maxCharCount);
//And then:
while (true)
{
    Thread.Sleep(1000); //Because of high CPU.
    FileStream stream = new FileStream(@"some path\info.txt", FileMode.OpenOrCreate, FileAccess.Write);
    StreamWriter writer = new StreamWriter(stream);
    StringBuilder sbWinText = new StringBuilder(256);
    GetWindowText(FindWindow(null, "Some text in title"), sbWinText, 256);
    writer.WriteLine(sbWinText.ToString());
    writer.Close();
}