How to restore SQL Server database through C# code

Question

I try to restore the database like this:

SQL = @"RESTORE DATABASE MyDataBase TO DISK='d:\MyDATA.BAK'";
                Cmd = new SqlCommand(SQL, Conn);
                Cmd.ExecuteNonQuery();
                Cmd.Dispose();

but I always get error:

Msg 3102, Level 16, State 1, Line 7
RESTORE cannot process database 'MyDataBase ' because it is in use by this session. It is recommended that the master database be used when performing this operation.
Msg 3013, Level 16, State 1, Line 7
RESTORE DATABASE is terminating abnormally.

Answer 1

I prefer to use SMO to restore a backup:

Microsoft.SqlServer.Management.Smo.Server smoServer = 
     new Server(new ServerConnection(server));

Database db = smoServer.Databases['MyDataBase'];
string dbPath = Path.Combine(db.PrimaryFilePath, 'MyDataBase.mdf');
string logPath = Path.Combine(db.PrimaryFilePath, 'MyDataBase_Log.ldf');
Restore restore = new Restore();
BackupDeviceItem deviceItem = 
    new BackupDeviceItem('d:\MyDATA.BAK', DeviceType.File);
restore.Devices.Add(deviceItem);
restore.Database = backupDatabaseTo;
restore.FileNumber = restoreFileNumber;
restore.Action = RestoreActionType.Database;
restore.ReplaceDatabase = true;
restore.SqlRestore(smoServer);

db = smoServer.Databases['MyDataBase'];
db.SetOnline();
smoServer.Refresh();
db.Refresh();

You'll need references to Microsoft.SqlServer.Smo, Microsoft.SqlServer.SmoExtended, and Microsoft.SqlServer.Management.Sdk.Sfc

Answer 2

Your DB connection is most likely to the database you're trying to restore. So there is a DB shared lock which prevents the restore of your db

Try this

SQL = @"USE master BACKUP DATABASE MyDataBase TO DISK='d:\MyDATA.BAK'";

Or change the connection details to use master DB