بازیابی فایل پشتیبان شده

من یک دیتابیس دارم که توی یک قسمت ازبرنامه ازش پشتیبان می گیرم :

SqlConnection objConnection = newSqlConnection("Server=PC;Database=VamDB;Integrated Security = True");

SqlDataAdapter objDataAdapter = newSqlDataAdapter();

objDataAdapter.SelectCommand = newSqlCommand();

objDataAdapter.SelectCommand.Connection = objConnection;

objDataAdapter.SelectCommand.CommandText = "Backup DataBase VamDB To Disk = '"+Masir+"' With INIT ";

objDataAdapter.SelectCommand.CommandType = CommandType.Text;

objConnection.Open();

objDataAdapter.SelectCommand.ExecuteNonQuery();

objConnection.Close();

MessageBox.Show("¢ىیى پ¬¢ی ںë  ںêيهçی¢ ںë¤ںê ¬§", "êيهçی¢ مêéیں¢", MessageBoxButtons.OK, MessageBoxIcon.Information);

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بعد در کدزیر ازش بازیابی میکنم :

SqlConnection objConnection = newSqlConnection("Server=PC;Database=VamDB;Integrated Security = True");

SqlDataAdapter objDataAdapter = newSqlDataAdapter();

objDataAdapter.SelectCommand = newSqlCommand();

objDataAdapter.SelectCommand.Connection = objConnection;

objDataAdapter.SelectCommand.CommandText = "Restore DataBase VamDB From Disk= '" + Masir + "' ";

objDataAdapter.SelectCommand.CommandType = CommandType.Text;

objConnection.Open();

objDataAdapter.SelectCommand.ExecuteNonQuery();

objConnection.Close();

اما این اررور رو میده؟
http://upload.iranblog.com/6/1245198633.jpg

SqlConnection objConnection = newSqlConnection("Server=PC;Database=VamDB;Integrated Security = True");

این خط رو به این صورت تغییر بده

 SqlConnection objConnection = newSqlConnection("Server=PC;Database=master;Integrated Security = True");