连接Access数据库：
using System;
using System.Data;
using System.Data.OleDb;

class TestADO
{
    static void Main(string[] args)
    {
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\test.mdb";
        string strSQL = "SELECT * FROM employees" ;

        OleDbConnection conn = new OleDbConnection(strDSN);
        OleDbCommand cmd = new OleDbCommand( strSQL, conn );
        OleDbDataReader reader = null;
        try
        {
            conn.Open();
            reader = cmd.ExecuteReader();
            while (reader.Read() )
            {
                Console.WriteLine("First Name:{0}, Last Name:{1}", reader["FirstName"], reader["LastName"]);
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            conn.Close();
        }
    }
}
using System;
using System.Data;  
using System.Data.OleDb;  

class TestADO
{ 
    static void Main(string[] args) 
    { 
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb"; 
        string strSQL = "INSERT INTO Employee(FirstName, LastName) VALUES('FirstName', 'LastName')" ; 
                  
        // create Objects of ADOConnection and ADOCommand  
        OleDbConnection conn = new OleDbConnection(strDSN); 
        OleDbCommand cmd = new OleDbCommand( strSQL, conn ); 
        try 
        { 
            conn.Open(); 
            cmd.ExecuteNonQuery(); 
        } 
        catch (Exception e) 
        { 
            Console.WriteLine("Oooops. I did it again:\n{0}", e.Message); 
        } 
        finally 
        { 
            conn.Close(); 
        }         
    }
} 
十二、使用OLEConn连接数据库：
using System;
using System.Data;  
using System.Data.OleDb;  

class TestADO
{ 
    static void Main(string[] args) 
    { 
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb"; 
        string strSQL = "SELECT * FROM employee" ; 

        OleDbConnection conn = new OleDbConnection(strDSN);
        OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );

        conn.Open();
        DataSet ds = new DataSet();
        cmd.Fill( ds, "employee" );
        DataTable dt = ds.Tables[0];

        foreach( DataRow dr in dt.Rows )
        {
            Console.WriteLine("First name: "+ dr["FirstName"].ToString() + " Last name: "+ dr["LastName"].ToString());
        }
        conn.Close(); 
    }
} 
十三、读取表的属性：
using System;
using System.Data;  
using System.Data.OleDb;  

class TestADO
{ 
    static void Main(string[] args) 
    { 
        string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb"; 
        string strSQL = "SELECT * FROM employee" ; 

        OleDbConnection conn = new OleDbConnection(strDSN);
        OleDbDataAdapter cmd = new OleDbDataAdapter( strSQL, conn );

        conn.Open();
        DataSet ds = new DataSet();
        cmd.Fill( ds, "employee" );
        DataTable dt = ds.Tables[0];