Wöchentlich Daten packen zippen verschieben und Originale löschen

using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;

namespace Archivieren
{
    class Program
    {

        static string date = System.DateTime.Now.ToString().Replace(".", "");  
        static string newdate = date.Substring(0, 8);

        static void Main(string args)
        {
            ProgrammStart();


            Console.ReadLine();
        }


        static async void ProgrammStart()
        {
            await Task.Run(() => { Zippen(); });
            await Task.Delay(500);
            if (File.Exists("D:\\" + newdate + ".zip"))  
            {
                File.Move("D:\\" + newdate + ".zip", "D:\\archive\\" + newdate + ".zip");  
                Console.WriteLine("Lösche Datei");  
                File.Delete("D:\\test.txt");  
            }
            else
            {
                Console.WriteLine("ZIP wurde nicht erstellt.Fehler.");  
            };
            Console.WriteLine("Beende..");  
            System.Environment.Exit(0);
        }




        static Task<int> Zippen()
        {
            var tcs = new TaskCompletionSource<int>();
                       
            Process rdcProcess = new Process();
            string executable3 = Environment.ExpandEnvironmentVariables(@"C:\\Program Files\\7-Zip\\7z.exe");  
            if (executable3 != null)
            {
                rdcProcess.StartInfo.FileName = executable3;
                rdcProcess.StartInfo.Arguments = "a D:\\" + newdate + ".zip D:\\test.txt";  
                rdcProcess.Start();

            }

            return tcs.Task;
        }


    }
}