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[DllImport("user32.dll")]
private static extern void keybd_event(byte bVk, uint bScan, uint dwFlags, uint dwExtraInfo);
[DllImport("user32.dll")]
private static extern uint MapVirtualKey(uint uCode, uint uMapType);
private const int VK_MENU = 18;
private const int VK_TAB = 9;
private void button1_Click(object sender, EventArgs e)
{
keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), 0, 0);
keybd_event(VK_TAB, MapVirtualKey(VK_TAB, 0), 0, 0);
keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), 2, 0);
keybd_event(VK_TAB, MapVirtualKey(VK_TAB, 0), 2, 0);
}