public partial class Form1 : Form
{
       [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern void mouse_event(UInt32 dwFlags, UInt32 dx, UInt32 dy, UInt32 dwData, IntPtr dwExtraInfo);
        [DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport("USER32.DLL")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        public void DoMouseClick()
        {
            Cursor.Position = new Point(this.Location.X + 670, this.Location.Y + 311);
            int X = Cursor.Position.X;
            int Y = Cursor.Position.Y;
           MouseEventArgs click = new MouseEventArgs(MouseButtons.Left, X, Y, 1, 30);
            const UInt32 MOUSEEVENTF_LEFTDOWN = 0x2;//left mouse down
            const UInt32 MOUSEEVENTF_LEFTUP = 0x4; //left mouse up
            mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, IntPtr.Zero);
            mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, IntPtr.Zero);
        }


}