DBF to FireBird

string connStr = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path.Substring(0, path.LastIndexOf("\\")) + ";Extended Properties=dBASE IV;";
string stringCon_FB = @"data source = localhost; port = 3050; initial catalog = D:\DB_TEST.FDB; user id = SYSDBA; password = *****; Dialect = 3";
                    
DataTable temp = new DataTable();
DateTime date_now = DateTime.Now; // Для отсеивания неактуальных данных
 
OleDbConnection conn = new OleDbConnection(connStr);
conn.Open();
 
FbConnection conn_FB = new FbConnection(stringCon_FB);
conn_FB.Open();
 
OleDbDataAdapter da = new OleDbDataAdapter("SELECT REGIONCODE, AREACODE, CITYCODE, OFFNAME, SHORTNAME FROM " + path.Substring(0, path.IndexOf(".")) + " WHERE ENDDATE>= #" + date_now.Day + "/" + date_now.Month + "/" + date_now.Year + "# AND AOLEVEL = 4", conn);
DataSet ds = new DataSet();
da.Fill(ds);
temp = ds.Tables[0];
 
FbTransaction transaction = conn_FB.BeginTransaction();
FbCommand cmd = conn_FB.CreateCommand();
cmd.Transaction = transaction;
cmd.CommandText = "create table fias_city (REGIONCODE INTEGER, AREACODE INTEGER, CITYCODE INTEGER, OFFNAME VARCHAR (50) NOT NULL, SHORTNAME VARCHAR(10) NOT NULL);";
cmd.ExecuteNonQuery();
transaction.Commit();
 
transaction = conn_FB.BeginTransaction();
cmd = conn_FB.CreateCommand();
cmd.Transaction = transaction;
foreach (DataRow row in temp.Rows)
{
                cmd.CommandText = "insert into " +
                    "fias_city " +
                    "values (" +
                    row["REGIONCODE"].ToString() + "," +
                    row["AREACODE"].ToString() + "," +
                    row["CITYCODE"].ToString() + ",'" +
                    row["OFFNAME"].ToString() + "','" +
                    row["SHORTNAME"].ToString() + "'" +
                    ");";
                cmd.ExecuteNonQuery();
}
transaction.Commit();
temp.Clear();
 
conn_FB.Close();
conn.Close();