Problem in sql backup

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C#

WinForms

Dear all

I want to backup of my database server with c sharp. I saw a method in google. and using this method now its create a error "failed to connect to server VS ".

  private void btnBackup_Click(object sender, EventArgs e)
        {
            BackupDatabase("RPSJDB","Sa","manish","VS","c:\\RPSJ.mdf");
//            Back();
        }

        public void BackupDatabase(String databaseName, String userName,String password, String serverName, String destinationPath)
        {
            Backup sqlBackup = new Backup();
            sqlBackup.Action = BackupActionType.Database;
            sqlBackup.BackupSetDescription = "ArchiveDataBase:" + DateTime.Now.ToShortDateString();
            sqlBackup.BackupSetName = "Archive";
            sqlBackup.Database = "RPSJDB";
            BackupDeviceItem deviceItem = new BackupDeviceItem("c:\\RPSJDB\\mk.mdf", DeviceType.File);
            ServerConnection connection = new ServerConnection("VS", "Sa", "manish");
            Server sqlServer = new Server(connection);
            Database db = sqlServer.Databases["RPSJDB"];
            sqlBackup.Initialize = true;
            sqlBackup.Checksum = true;
            sqlBackup.ContinueAfterError = true;
            sqlBackup.Devices.Add(deviceItem);
            sqlBackup.Incremental = false;
            sqlBackup.ExpirationDate = DateTime.Now.AddDays(3);
            sqlBackup.LogTruncation = BackupTruncateLogType.Truncate;
            sqlBackup.FormatMedia = false;
            sqlBackup.SqlBackup(sqlServer);
        }