OLE DB - First steps

#include "stdafx.h"

#using <mscorlib.dll>
#using <System.Data.dll>
#using <System.dll>
#include <tchar.h>

using namespace System;
using namespace System::Data::OleDb;

void InsertRecord(String* nam, int age);
void ShowAge(String* nam);

int _tmain(void)
{
	
	InsertRecord("Tom",25);
	InsertRecord("Harry",26);
	InsertRecord("Jasonb",24);
	InsertRecord("Andy",26);

	ShowAge("Tom");
	ShowAge("Andy");
	ShowAge("Henry");

    return 0;
}

void InsertRecord(String* nam, int age)
{
	OleDbConnection* conn = new OleDbConnection(
		"PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\test.mdb");

	conn->Open();

	String* sqlstr = String::Format("insert into main(Name,Age) values('{0}',{1})",
		nam,__box(age));

	OleDbCommand* cmd = new OleDbCommand(sqlstr,conn);

	cmd->ExecuteNonQuery();

	conn->Close();
}

void ShowAge(String* nam)
{
	OleDbConnection* conn = new OleDbConnection(
		"PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\test.mdb");

	conn->Open();

	String* sqlstr = String::Format("select age from main where Name = '{0}'",nam);

	OleDbCommand* cmd = new OleDbCommand(sqlstr,conn);

	OleDbDataReader* rdr = cmd->ExecuteReader();

	if(rdr->Read())
	{
		Console::WriteLine("{0} is {1} years old",
			nam,rdr->get_Item("Age"));
	}
	else
	{
		Console::WriteLine("No matches found for {0}!",nam);
	}

	conn->Close();
}