OleDbCommand cmd = new OleDbCommand(szCmd, conn);
            try
            {
                cmd.ExecuteNonQuery();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

CREATE TABLE TABLE1.DBF (Name1 char(254),Name2 char(254),Name3 char(254),Name4 char(254),Name5 char(254),Name6 char(254),Name7 char(254),Name8 char(254),Name9 char(254),Name10 char(254),Name11 char(254),Name12 char(254),Name13 char(254),Name14 char(254),Name15 char(254),Name16 char(254))

 private void button1_Click(object sender, EventArgs e)
        {
            string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + ";Extended Properties=dBASE IV;User ID=Admin;Password=";

            OleDbConnection conn = new OleDbConnection(connStr);
            try
            {
                conn.Open();
                conn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("не удалось соединиться\n" + ex.Message);
                return;
            }

            try { System.IO.File.Delete("TABLE1.DBF"); }
            catch { }

            string szCmd = "CREATE TABLE TABLE1.DBF (";
            int N=16;
            for (int i = 1; i <= N; i++)
            {
                szCmd += "Name" + i.ToString() + " char(254),";
            }
            szCmd = szCmd.Replace("Name" + N.ToString() + " char(254),", "Name" + N.ToString() + " char(254))");
            conn.Open();
            OleDbCommand cmd = new OleDbCommand(szCmd, conn);
            try
            {
                cmd.ExecuteNonQuery();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Поле не помещается в записи.

// Формат dBASE III 2.0
   byte[] buffer = new byte[]{0x03, 0x63, 0x04, 0x04}; // Заголовок  4 байта

// Создаю таблицу
            System.IO.File.Delete(Folder + DT.TableName+".DBF");
            string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath +
                            ";Extended Properties=dBASE 5.0;User ID=Admin;Password=";

            OleDbConnection conn = new OleDbConnection(connStr);
            try
            {
                conn.Open();
                conn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("не удалось соединиться\n" + ex.Message);
                return;
            }
            conn.Open();
            OleDbCommand cmd = new OleDbCommand("CREATE TABLE "+ DT.TableName + ".DBF (SSS char(1))", conn);
            cmd.ExecuteNonQuery();
            conn.Close();

            System.IO.FileStream FS = new System.IO.FileStream(Folder + DT.TableName + ".DBF", System.IO.FileMode.OpenOrCreate);
            // Формат dBASE III 2.0