private readonly int MOUSEEVENTF_LEFTDOWN = 0x0002;
private readonly int MOUSEEVENTF_LEFTUP = 0x0004;
private readonly int MOUSEEVENTF_ABSOLUTE = 0x8000;
[System.Runtime.InteropServices.DllImport("user32")]
public static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo);