SQL Server异常smo.extended C＃的备份/还原失败

Question

public static readonly string ConnectionString = @"Data Source=JOSEPH-PC\SQLEXPRESS;Initial Catalog=Storage;Integrated Security=True";

private void button2_Click(object sender, EventArgs e)
{
    try
    {
        if (string.IsNullOrEmpty(txtrestore.Text) | string.IsNullOrEmpty(ComboBoxserverName.Text) | string.IsNullOrEmpty(ComboBoxDatabaseName.Text))
        {
            // label3.Visible = true;
            MessageBox.Show("Server Name & Database & Restore file can not be Blank");
            return;
        }
        else
        {
            , ComboBoxDatabaseName.Text, ComboBoxserverName.Text);
            RestoreDatabase(ComboBoxDatabaseName.Text, "C:\RESTORE\hw.bak", ComboBoxserverName.Text);
            label4.Visible = true;
            label4.ForeColor = System.Drawing.Color.Green;
            label4.Text = "Database restore has been created successfully";
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void Backup_Click(object sender, EventArgs e)
{
    try {
       if (string.IsNullOrEmpty(ComboBoxserverName.Text) | string.IsNullOrEmpty(ComboBoxDatabaseName.Text))
       {
           // label3.Visible = true;
           MessageBox.Show("Server Name & Database can not be Blank");
           return;
       }
       else {
           SaveFileDialog1.FileName = ComboBoxDatabaseName.Text;
           SaveFileDialog1.ShowDialog();
           string s = null;
           s = SaveFileDialog1.FileName;
           BackupDatabase(s + ".bak", ComboBoxDatabaseName.Text, ComboBoxserverName.Text);
           label3.Visible = true;
           label3.ForeColor = System.Drawing.Color.Green;
           label3.Text = "Database backup has been created successfully";
       }
   }
   catch(Exception ex)
   {
       MessageBox.Show(ex.Message);
   }
}

backup</param>

public void BackupDatabase(string backUpFile,string db,string srv)
{
    try {
        ServerConnection con = new ServerConnection(@""+srv);
        Server server = new Server(con);
        Backup source = new Backup();
        source.Action = BackupActionType.Database;
        source.Database = db;
        BackupDeviceItem destination = new BackupDeviceItem(backUpFile, DeviceType.File);
        source.Devices.Add(destination);
        source.SqlBackup(server);
        con.Disconnect();
    }
    catch(Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

public void RestoreDatabase(String databaseName, String backUpFile, String srv)
{
     Microsoft.SqlServer.Management.Smo.Server smoServer = new Server(new ServerConnection(srv));

     Database db = smoServer.Databases["Storage"];

     string dbPath = System.IO.Path.Combine(db.PrimaryFilePath, "Storage.MDF");
     string logPath = System.IO.Path.Combine(db.PrimaryFilePath, "Storage_1.LDF");

     Restore restore = new Restore();
     BackupDeviceItem deviceItem = new BackupDeviceItem("C:/RESTORE/hw.BAK", DeviceType.File);
     restore.Devices.Add(deviceItem);
     restore.Database = "C:/RESTORE/hw.BAK";

     string fileMdf = System.IO.Path.Combine(smoServer.MasterDBPath, "Storage.mdf");
     string fileLdf = System.IO.Path.Combine(smoServer.MasterDBLogPath, "Storage_1.ldf");

     RelocateFile relocateMdf = new RelocateFile("Storage", fileMdf);
     RelocateFile relocateLdf = new RelocateFile("Storage_1", fileLdf);

     restore.RelocateFiles.Add(relocateMdf);
     restore.RelocateFiles.Add(relocateLdf);
     restore.FileNumber = 1;
     restore.Action = RestoreActionType.Database;
     restore.ReplaceDatabase = true;
     restore.SqlRestore(smoServer);

     db = smoServer.Databases["Storage"];
     db.SetOnline();
     smoServer.Refresh();
     db.Refresh();
}

好的，这是我的代码。顺便说一下，我知道我不会在恢复方法中使用params，但这是我尝试实现此方法的众多方法之一。

我从两种方法得到同样的错误

  

服务器JOSEPH-PC / SQLEXPRESS的备份失败

或

  

服务器JOSEPH-PC / SQLEXPRESS的恢复失败。

备份昨天正在运行，恢复没有。

现在这些方法都没有工作，我没有在BACKUP的代码中改变它。

我也试过这两个命令

  private string singleUserCmd = "alter database Storage set SINGLE_USER WITH ROLLBACK IMMEDIATE";
        private string multiUserCmd = "alter database Storage set MULTI_USER";

再次出现同样的错误......

我花了10多个小时搜索帖子，我已经尝试了很多方法来实现这些方法，我希望得到答案。

谢谢。