SMO恢复并不总是有效

我的问题基本上在标题中说明了，但我会尝试扩展它。我正在尝试备份数据库，然后将该数据库恢复到位于同一服务器上的另一个数据库。现在我将其保存在同一台服务器上用于测试，但我可能需要将其恢复到新服务器上。

代码工作正常，没有错误之类的。但是如果我运行一次，不能保证恢复的数据库得到更新。如果我运行它5次，它很可能会更新数据库。

我只是想知道为什么它不立即更新?

using Microsoft.SqlServer.Management.Common;
using Microsoft.SqlServer.Management.Smo;
using System;
// This program is used to perform a full database backup. The code also includes a SMO      restore as well
namespace BackupDB
{
    class Program
    {
        static void Main(string[] args)
        {
            // Connecting to the server
            ServerConnection serverConn = new ServerConnection(@"T520-R9K0H1K'SQLEXPRESS");
            Server server = new Server(serverConn);
            backup(serverConn, server);
            restore(serverConn, server);
            Console.WriteLine("Closing Application");
            Environment.Exit(0);
        } // Main
        public static void backup(ServerConnection serverConn, Server server)
        {
            if (!serverConn.IsOpen)
            {
                serverConn.Connect();
            }
            Backup bkpDBFull = new Backup();
            bkpDBFull.Action = BackupActionType.Database;
            bkpDBFull.Database = "databaseTest";
            BackupDeviceItem bkpDevice = new BackupDeviceItem(@"C:'BakFiles'test.bak", DeviceType.File);
            bkpDBFull.Devices.Add(bkpDevice);
            bkpDBFull.BackupSetName = "databaseTest Backup";
            bkpDBFull.BackupSetDescription = " databaseTest - Full Backup";
            bkpDBFull.NoRecovery = false;
            bkpDBFull.Initialize = true;
            try
            {
                bkpDBFull.SqlBackupAsync(server);
                Console.WriteLine("Backup Complete");
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                Console.Write(ex.Source);
            }
            finally{ serverConn.Disconnect(); }
        } // Backup
        public static void restore(ServerConnection serverConn, Server server)
        {
            if (!serverConn.IsOpen)
            {
                serverConn.Connect();
            }
            Restore destination = new Restore();
            destination.Action = RestoreActionType.Database;
            destination.ReplaceDatabase = true;
            destination.Database = "RestoreDB";
            BackupDeviceItem source = new BackupDeviceItem(@"C:'BakFiles'test.bak", DeviceType.File);
            destination.Devices.Add(source);
            destination.NoRecovery = false;
            destination.RelocateFiles.Add(new RelocateFile("databaseTest", @"C:'Restored'test.mdf"));
            destination.RelocateFiles.Add(new RelocateFile("databaseTest_Log", @"C:'Restored'test_log.ldf"));
            try
            {
                destination.SqlRestoreAsync(server);
                Console.WriteLine("Restore Complete");
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                Console.Write(ex.Source);
            }
            finally{ serverConn.Disconnect(); } 
        } // Restore
    } // Class
} // Namespace