{"Restore failed for Server '\\\\.\\pipe\\3F103E6E-3FD4-47\\tsql\\query'. "}

[Mohammad Dayyan]

Hi guys, I'm using the following code to restore a backup sql database with C# and SMO.

void RestoreDatabaseWithSMO(string sConnect, string dbName, string backUpPath)
{
using (SqlConnection cnn = new SqlConnection(sConnect))
{
cnn.Open();
cnn.ChangeDatabase("master");

    ServerConnection sc = new ServerConnection(cnn);
    Server sv = new Server(sc);

    if (!sv.Databases.Contains(dbName))
        throw new Exception("this DataBase does not exist");

    // Create backup device item for the backup
    BackupDeviceItem bdi = new BackupDeviceItem(backUpPath, DeviceType.File);

    // Create the restore object
    Restore resDB = new Restore();
    resDB.PercentComplete += new PercentCompleteEventHandler(percentComplete);
    resDB.PercentCompleteNotification = 10;
    resDB.Devices.Add(bdi);
    resDB.NoRecovery = false;
    resDB.ReplaceDatabase = true;
    resDB.Database = dbName;
    resDB.Action = RestoreActionType.Database;

    // Restore the database
    resDB.SqlRestore(sv);//Exception
}

}

but in the last line I got below exception !!!

{"Restore failed for Server '\\\\.\\pipe\\3F103E6E-3FD4-47\\tsql\\query'. "}

What's wrong with it ? Could you please guide me? Thanks