import user32.dll in c#

[C# Programming]

how do i import user32.dll in c# in the below written code
for invoking start button
urgent please....


since this is not working

private void page_Load
{
if(condition)
{
//invoke the start key. i want the menu to pop up just as we click the start menu
SendKeys.Send("^{ESC}");
}
}

This code was posted by me...