public List<int> GetDataBlockId_byFilenameAndBytesCount(string filename, int bytesCount)
{
List<int> dataBlockIds = new List<int>();
SQLDB_Records sqldbRecords = new SQLDB_Records(connectionString);
dataBlockIds = sqldbRecords.Get_DataBlockIdByFileNameAndBytesCount(filename, bytesCount);
return dataBlockIds;
}