Программно выполняем Ctrl+C

[DllImport("user32.dll", SetLastError = true)]
private static extern void keybd_event( byte bVk, byte bScan, uint dwFlags, int dwExtraInfo );
 
private static void SendCtrlhotKey( char key ) {
  keybd_event(      0x11, 0,   0, 0);
  keybd_event( (byte)key, 0,   0, 0);
  keybd_event( (byte)key, 0, 0x2, 0);
  keybd_event(      0x11, 0, 0x2, 0);
}

SendCtrlhotKey( 'C' );