private TimeSpan ImportMembersSQL(IList<DocMember> members)
        {
            using (var db = new DocEntities())
            {
                db.Database.CreateIfNotExists();
            }

            using (var connection = Database.DefaultConnectionFactory.CreateConnection("DocEntities"))
            {
                connection.Open();

                using (var transaction = connection.BeginTransaction())
                using (var insertMemberCommand = connection.CreateCommand())
                using (var insertItemCommand = connection.CreateCommand())
                using (var getIdentityCommand = connection.CreateCommand())
                {
                    insertMemberCommand.CommandText =
                        "INSERT INTO DocMembers(Name, MemberType, AssemblyName) VALUES(@name, @memberType, @assemblyName)";
                    insertMemberCommand.AddParameter("@name", DbType.String);
                    insertMemberCommand.AddParameter("@memberType", DbType.String);
                    insertMemberCommand.AddParameter("@assemblyName", DbType.String);
                    insertMemberCommand.Transaction = transaction;
                    insertMemberCommand.Prepare();

                    insertItemCommand.CommandText =
                        "INSERT INTO DocItems(PartType, PartName, Text, Member_Id) VALUES (@partType, @partName, @text, @memberId)";
                    insertItemCommand.AddParameter("@partType", DbType.String);
                    insertItemCommand.AddParameter("@partName", DbType.String);
                    insertItemCommand.AddParameter("@text", DbType.String);
                    insertItemCommand.AddParameter("@memberId", DbType.Int32);
                    insertItemCommand.Transaction = transaction;
                    insertItemCommand.Prepare();

                    getIdentityCommand.CommandText = "SELECT @@IDENTITY AS Id";
                    getIdentityCommand.Transaction = transaction;
                    getIdentityCommand.Prepare();

                    var sw = Stopwatch.StartNew();

                    foreach (var m in members)
                    {
                        insertMemberCommand.Parameters["@name"].Value = m.Name;
                        insertMemberCommand.Parameters["@memberType"].Value = m.MemberType;
                        insertMemberCommand.Parameters["@assemblyName"].Value = m.AssemblyName;
                        insertMemberCommand.ExecuteNonQuery();
                        m.Id = Convert.ToInt32(getIdentityCommand.ExecuteScalar());

                        foreach (var item in m.Items)
                        {
                            insertItemCommand.Parameters["@partType"].Value = item.PartType;
                            insertItemCommand.Parameters["@partName"].Value = item.PartName;
                            insertItemCommand.Parameters["@text"].Value = item.Text;
                            insertItemCommand.Parameters["@memberId"].Value = m.Id;
                            insertItemCommand.ExecuteNonQuery();
                            item.Id = Convert.ToInt32(getIdentityCommand.ExecuteScalar());
                        }
                        Progress++;
                    }

                    transaction.Commit();

                    sw.Stop();
                    return sw.Elapsed;
                }
            }
        }