Windows 7 and Vista UAC - Programmatically requesting elevation in C#

I have a program that only requires elevation to Admin on very rare occasions so I do not want to set-up my manifest to require permanent elevation.

How can I Programmatically r开发者_如何转开发equest elevation only when I need it?

I am using C#

WindowsPrincipal principal = new WindowsPrincipal(WindowsIdentity.GetCurrent());
bool hasAdministrativeRight = principal.IsInRole(WindowsBuiltInRole.Administrator);

if (!hasAdministrativeRight)
{
    RunElevated(Application.ExecutablePath);
    this.Close();
    Application.Exit();
}

private static bool RunElevated(string fileName)
{
    //MessageBox.Show("Run: " + fileName);
    ProcessStartInfo processInfo = new ProcessStartInfo();
    processInfo.Verb = "runas";
    processInfo.FileName = fileName;
    try
    {
        Process.Start(processInfo);
        return true;
    }
    catch (Win32Exception)
    {
        // Do nothing. Probably the user canceled the UAC window
    }
    return false;
}