proc.StartInfo.UseShellExecute = true;
proc.StartInfo.Verb = "runas";

Exec '"$WINDIRexplorer.exe" "$TEMPMyUnElevatedProcess.exe"'

Exec '"$WINDIRexplorer.exe" "$TEMPMyUnElevatedProcess.exe"'

class Program
{
    static void Main(string[] args)
    {
        var psi = new ProcessStartInfo(@"c:windowssystem32whoami.exe");
        var password = new SecureString();
        password.AppendChar('s');
        password.AppendChar('e');
        password.AppendChar('c');
        password.AppendChar('r');
        password.AppendChar('e');
        password.AppendChar('t');
        psi.Password = password;
        psi.UserName = "username";
        psi.UseShellExecute = false;
        psi.RedirectStandardOutput = true;

        var p = new Process();
        p.StartInfo = psi;
        p.Start();
        p.WaitForExit();

        Console.WriteLine(p.StandardOutput.ReadToEnd());
    }
}