C # simulate a mouse click event FindWindow instance

[DllImport ("User32.dll", EntryPoint = "FindWindow")] private static extern IntPtr FindWindow (string lpClassName, string lpWindowName); private void button2_Click (object sender, EventArgs e) {IntPtr formHandle = FindWindow (null, "window title"); // 0x0175015f hexadecimal coordinate, decimal to hexadecimal (x high, y low) (0175) x = 373, (015F) y = 351 SendMessage (formHandle, 0x0201, 0, (int) 0x0175015f); // send WM_LBUTTONDOWN = 0x0201 left-click to press SendMessage (formHandle, 0x0202, 0, (int) 0x0175015f); // send WM_LBUTTONUP = 0x0202 left-click lift}