Retrive Data From .dbf File Using OLEDB

using System;
using System.Data;
using System.Data.OleDb;
using System.IO;
/// <summary>
/// Summary description for dbf
/// </summary>
public class dbf
{
    private OleDbConnection conn;
    private OleDbCommand cmd;
    private OleDbDataReader dr;
    private string sqlStr = "";
    private DataSet myDataSet;
    private OleDbDataAdapter myAdapter;
    private int r_val;
    public dbf()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    public void oledb_conn()
    {
        conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=F:\mockreal\map;Extended Properties=DBASE III;");
    }
    public DataSet Execute_dataset(string sqlStr)
    {
        oledb_conn();
        conn.Open();
        //sqlStr = "update G.dbf set CRIME=10 where PARCEL_NO='20'";
        //Make a DataSet object
        myDataSet = new DataSet();
        //Using the OleDbDataAdapter execute the query
        //cmd = new OleDbCommand(sqlStr,conn);
        //int r_val = cmd.ExecuteNonQuery();
        myAdapter = new OleDbDataAdapter(sqlStr, conn);
        //Build the Update and Delete SQL Statements
        //OleDbCommandBuilder myBuilder = new OleDbCommandBuilder(myAdapter);
        try
        {
            //Fill the DataSet with the Table 'bookstock'
            myAdapter.Fill(myDataSet);
            conn.Close();
        }
        catch (Exception oEx)
        {
            throw (oEx);
        }
        return myDataSet;
    }
    public int Execute_command(string sqlStr)
    {
        oledb_conn();
        conn.Open();
        try
        {
            cmd = new OleDbCommand(sqlStr, conn);
            r_val = cmd.ExecuteNonQuery();
        }
        catch (Exception oEx)
        {
            throw (oEx);
        }
        return r_val;
    }
}