update t_AUVersions
set Binary = 0x636F6F6C
where id = 7

select binary
from t_AUVersions
where id = 7

update t_AUVersions
set Binary = Binary + 0x888
where id = 7

select binary
from t_AUVersions
where id = 7

t_AUVersion ver = new t_AUVersion()
            {
                Id_file = db.t_AUFiles.Where(f => f.Key == _key).Select(f => f.Id).FirstOrDefault(),
                UploadDate = DateTime.Now,
                FileLastWriteTIme = file.LastWriteTime,
                Version = FileVersionInfo.GetVersionInfo(file.FullName).FileVersion ?? DBNull.Value.ToString(),
                Size = Convert.ToInt32(file.Length),
                IsActive = active,
                IsDel = false
            };

            db.t_AUVersions.InsertOnSubmit(ver);
            db.SubmitChanges();

ver.Binary = ver.Binary + partBytes; 
db.SubmitChanges();