Question

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Exclusive access could not be obtained because the database is in use

I use C#, .net4 and SQL Server 2008 R2 in project and use this code to restore a database:

_comm = new SqlCommand("use master; RESTORE DATABASE [DB1] FROM  DISK = @Address WITH  RESTRICTED_USER,  FILE = 1,  NOUNLOAD,  REPLACE,  STATS = 10; use DB1;", _conn);
        _comm.CommandType = System.Data.CommandType.Text;
        _comm.Parameters.AddRange(new SqlParameter[] 
                {
                new SqlParameter("@Address", _path)
                });

            _conn.Open();
            _comm.ExecuteNonQuery();

The following error is displayed:

Exclusive access could not be obtained because the database is in use.
RESTORE DATABASE is terminating abnormally.
Changed database context to ‘master’.
Changed database context to ‘DB1’.

Answer 1

its better to use SMO (cause no need for master) once you are connected to the server you do whatever you want

using Microsoft.SqlServer.Management.Smo;

...

        Server myServer = new Server(@".\SQLExpress");

        Database mydb = myServer.Databases["DB1"];
        if(mydb!=null)
           myServer.KillAllProcesses(mydb.Name);//detach

        Restore restoreDB = new Restore();
        restoreDB.Database = mydb.Name;

        restoreDB.Action = RestoreActionType.Database;
        restoreDB.Devices.AddDevice(_path, DeviceType.File);


        restoreDB.ReplaceDatabase = true;

        restoreDB.NoRecovery = false;

        restoreDB.SqlRestore(myServer);

BACKUP

        Server myServer = new Server(@".\SQLExpress");

        Database mydb = myServer.Databases["DB1"];

        Backup bkp = new Backup();

        bkp.Action = BackupActionType.Database;

        bkp.Database = mydb.Name;

        bkp.Devices.AddDevice(_path, DeviceType.File);

        bkp.BackupSetName = "DB1 backup";//optional
        bkp.BackupSetDescription = "mybackup dated " + DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss");//optional

        bkp.Initialize = true;
        bkp.Incremental = false;

        bkp.SqlBackup(myServer);

References :

C:\Program Files (x86)\Microsoft SQL Server\100\SDK\Assemblies\Microsoft.SqlServer.ConnectionInfo.dll

C:\Program Files (x86)\Microsoft SQL Server\100\SDK\Assemblies\Microsoft.SqlServer.Management.Sdk.Sfc.dll

C:\Program Files (x86)\Microsoft SQL Server\100\SDK\Assemblies\Microsoft.SqlServer.Smo.dll

C:\Program Files (x86)\Microsoft SQL Server\100\SDK\Assemblies\Microsoft.SqlServer.SmoExtended.dll