Имитация кликов мышки в нескольких приложениях

public static Bitmap GetWindowBMP(IntPtr hwnd)
        {
            IntPtr windowDC = user32.GetWindowDC(hwnd);
            RECT wndRect = new RECT();
            RECT cltRect = new RECT();
            user32.GetWindowRect(hwnd, ref wndRect);
            user32.GetClientRect(hwnd, out cltRect);
            POINT point = new POINT(cltRect.Location.X, cltRect.Location.X);
            user32.ClientToScreen(hwnd, out point);
            IntPtr hDC = gdi32.CreateCompatibleDC(windowDC);
            IntPtr hObject = gdi32.CreateCompatibleBitmap(windowDC, wndRect.Width, wndRect.Height);
            IntPtr ptr4 = gdi32.SelectObject(hDC, hObject);
            user32.PrintWindow(hwnd, hDC, 0);
            IntPtr ptr5 = gdi32.CreateCompatibleDC(windowDC);
            IntPtr ptr6 = gdi32.CreateCompatibleBitmap(windowDC, cltRect.Width, cltRect.Height);
            IntPtr ptr7 = gdi32.SelectObject(ptr5, ptr6);
            gdi32.BitBlt(ptr5, 0, 0, cltRect.Width, cltRect.Height, hDC, point.X - wndRect.Location.X, point.Y - wndRect.Location.Y, TernaryRasterOperations.SRCCOPY);
            Bitmap bmp = Bitmap.FromHbitmap(ptr6);
            gdi32.SelectObject(hDC, ptr4);
            gdi32.SelectObject(ptr5, ptr7);
            gdi32.DeleteDC(hDC);
            gdi32.DeleteDC(ptr5);
            gdi32.DeleteObject(hObject);
            gdi32.DeleteObject(ptr6);
            user32.ReleaseDC(hwnd, windowDC);
            return bmp;

            POINT ClientLeftTop;
            user32.ClientToScreen(hwnd, out ClientLeftTop);
            user32.SetCursorPos(ClientLeftTop.X + X, ClientLeftTop.Y + Y);
            user32.mouse_event((uint)WinApi.Enums.MouseEventFlags.LEFTDOWN, 0, 0, 0, 0);
            System.Threading.Thread.Sleep(Delay);
            user32.mouse_event((uint)WinApi.Enums.MouseEventFlags.LEFTUP, 0, 0, 0, 0);

[DllImport("User32.dll")]
        static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, int dwExtraInfo); // Для перемещения мыши
 
        [Flags]
        public enum MouseEventFlags // Флаги для манипуляции мышью
        {
            LEFTDOWN = 0x00000002,
            LEFTUP = 0x00000004,
            MIDDLEDOWN = 0x00000020,
            MIDDLEUP = 0x00000040,
            MOVE = 0x00000001,
            ABSOLUTE = 0x00008000,
            RIGHTDOWN = 0x00000008,
            RIGHTUP = 0x00000010
        };
 
Cursor.Position = new Point(X, Y); // Перемещаем курсор
mouse_event((int)(MouseEventFlags.RIGHTDOWN), Cursor.Position.X, Cursor.Position.Y, 0, 0); // Кликаем 
mouse_event((int)(MouseEventFlags.RIGHTUP), Cursor.Position.X, Cursor.Position.Y, 0, 0); // Отпускаем

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//using System;
using System.Runtime.InteropServices;
 
 
namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        
        private Button button1 = new Button();
 
        public Form1()
        {
            button1.Location = new Point(10, 10);
            button1.TabIndex = 0;
            button1.Text = "Click to automate Calculator";
            button1.AutoSize = true;
            button1.Click += new EventHandler(button1_Click);
 
            this.DoubleClick += new EventHandler(Form1_DoubleClick);
            this.Controls.Add(button1);
        }
 
 
        [Flags]
        public enum WindowMessages : uint
        {
            WM_MOUSEMOVE = 0x200,
            WM_LBUTTONDOWN = 0x201,
            WM_RBUTTONDOWN = 0x204,
            WM_MBUTTONDOWN = 0x207,
            WM_LBUTTONUP = 0x202,
            WM_RBUTTONUP = 0x205,
            WM_MBUTTONUP = 0x208,
            WM_LBUTTONDBLCLK = 0x203,
            WM_RBUTTONDBLCLK = 0x206,
            WM_MBUTTONDBLCLK = 0x209,
            WM_MOUSEWHEEL = 0x020A,
            WM_KEYDOWN = 0x100,
            WM_KEYUP = 0x101,
            WM_SYSKEYDOWN = 0x104,
            WM_SYSKEYUP = 0x105,
        }
 
        // Get a handle to an application window.
        [DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName,
            string lpWindowName);
 
        // Activate an application window.
        [DllImport("USER32.DLL")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);
 
        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
 
        // Send a series of key presses to the Calculator application.
        private void button1_Click(object sender, EventArgs e)
        {
            // Get a handle to the Calculator application. The window class
            // and window name were obtained using the Spy++ tool.
            IntPtr calculatorHandle = FindWindow("SciCalc","Калькулятор");
 
            // Verify that Calculator is a running process.
            if (calculatorHandle == IntPtr.Zero)
            {
                MessageBox.Show("Calculator is not running.");
                return;
            }
 
            // Make Calculator the foreground application and send it 
            // a set of calculations.
            //SetForegroundWindow(calculatorHandle);
            //SendKeys.SendWait("111");
            //SendKeys.SendWait("*");
            //SendKeys.SendWait("11");
            //SendKeys.SendWait("=");
            SendMessage(calculatorHandle, (uint) WindowMessages.WM_LBUTTONDOWN, 685, 264);
            SendMessage(calculatorHandle, (uint) WindowMessages.WM_LBUTTONUP, 685, 264);
 
        }
 
        // Send a key to the button when the user double-clicks anywhere 
        // on the form.
        private void Form1_DoubleClick(object sender, EventArgs e)
        {
            // Send the enter key to the button, which raises the click 
            // event for the button. This works because the tab stop of 
            // the button is 0.
            SendKeys.Send("{ENTER}");
        }
        }
}