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SendMessage(WM_CLICK, ...)                    

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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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
private void button2_Click(object sender, EventArgs e)
        {
            Cursor.Position = new Point(760, 240);
            SendMessage(WM_CLICK, ...)
        }}}                    

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textBox1.Text = Convert.ToString(Cursor.Position.X);
            textBox2.Text = Convert.ToString(Cursor.Position.Y);

Cursor.Position = new Point(760, 240);                    

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//  entweder:
System.Windows.Forms.Cursor.Position = new Point(760, 240);
//  oder:
System.Messaging.Cursor.Position = new Point(760, 240);                    

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SendKeys.Send("%({TAB)");                    

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SendKeys.Send("%^({DEL)");                    

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private void textBox1_MouseClick(object sender, MouseEventArgs e)
{
    SendKeys.Send("(Hallo Test)");
}                    

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        public void SendMouseClick(Process proc, Point location)
        {
            // this private method sends mouse clicks to a given point location
            // get the process' window handle
            IntPtr hWnd = GetWindowHandle(proc);
            // store the handle and process in a HandleRef
            HandleRef hRef = new HandleRef(proc, hWnd);
            // send the MouseButtonDown message using SendMessage
            win32API.SendMessage(hRef, System.Convert.ToUInt32(win32API.WM_Cmd.WM_LBUTTONDOWN), IntPtr.Zero, (IntPtr)(((location.Y * 0X10000) + location.X)));
            // sleep a bit
            System.Threading.Thread.Sleep(50);
            // send the MouseButtonUp message using SendMessage
            win32API.SendMessage(hRef, System.Convert.ToUInt32(win32API.WM_Cmd.WM_LBUTTONUP), IntPtr.Zero, (IntPtr)(((location.Y * 0X10000) + location.X)));                    

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SendMessage(HWND, WM_LBUTTONDOWN, MK_LBUTTON, (((location.Y * 0X10000) + location.X)));
SendMessage(HWND, WM_LBUTTONUP, MK_LBUTTON, (((location.Y * 0X10000) + location.X)));