lab21(Program.cs)

using System.Threading.Tasks;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Security.Principal;
using System.Windows.Forms;

namespace lab21
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            WindowsPrincipal pricipal = new WindowsPrincipal(WindowsIdentity.GetCurrent());
            bool hasAdministrativeRight = pricipal.IsInRole(WindowsBuiltInRole.Administrator);

            if (hasAdministrativeRight == false)
            {
                ProcessStartInfo processInfo = new ProcessStartInfo();
                processInfo.Verb = "runas";
                processInfo.FileName = Application.ExecutablePath;
                try
                {
                    Process.Start(processInfo);
                }
                catch (Win32Exception)
                {
                }
                Application.Exit();
            }
            else
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
            }
        }
    }
}