Вот, придумал! 
На форме 2 кнопки: button1 и button2. При нажатии button1, программно нажимается button2.
| Код |
using System;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Threading;
namespace WindowsApplication3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button2.Click += new EventHandler(button2_Click);
}
void button2_Click(object sender, EventArgs e)
{
MessageBox.Show("Button2 clicked!");
}
const uint WM_LBUTTONDOWN = 513;
const uint WM_LBUTTONUP = 514;
const int Period = 200;
IntPtr NIL = new IntPtr();
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
private void button1_Click(object sender, EventArgs e)
{
SendMessage(button2.Handle, WM_LBUTTONDOWN, NIL, NIL);
Application.DoEvents();
Thread.Sleep(Period);
SendMessage(button2.Handle, WM_LBUTTONUP, NIL, NIL);
}
}
}
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