Csharp/CSharp Tutorial/ADO.Net/Access

Connecting To Access

using System;
using System.Data.OleDb;
class MainClass
{
  static void Main(string[] args)
  {
    OleDbConnection MyConnection = new OleDbConnection (@"Provider=Microsft.Jet.OLEDB.4.0; Data Source = c:\Northwind.mdb");
    MyConnection.Open();      
  }
}

Connecting to a Microsoft Access Database

using System;
using System.Data;
using System.Data.OleDb;

    class Program
    {
        static void Main(string[] args)
        {
            string oledbConnectString =
                "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Northwind2007.accdb;";
            using (OleDbConnection connection = new OleDbConnection(oledbConnectString))
            {
                connection.Open(  );
                Console.WriteLine("Connection State: {0}", connection.State);
                Console.WriteLine("OLE DB Provider: {0}", connection.Provider);
                Console.WriteLine("Server Version: {0}", connection.ServerVersion);
            }
        }
    }

Connecting to a Password-Protected Microsoft Access Database

using System;
using System.Data;
using System.Data.OleDb;
    class Program
    {
        static void Main(string[] args)
        {
            string oledbConnectString =
                "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Northwind.accdb;" +
                "Jet OLEDB:Database Password=password;";
            using (OleDbConnection connection = new OleDbConnection(oledbConnectString))
            {
                connection.Open(  );
                Console.WriteLine("Connection State: {0}", connection.State);
                Console.WriteLine("OLE DB Provider: {0}", connection.Provider);
                Console.WriteLine("Server Version: {0}", connection.ServerVersion);
            }
        }
    }

Read data from Access database

using System;
using System.Data;
using System.Data.rumon;
using System.Data.OleDb;
class MainClass
{
  static void Main(string[] args)
  {
    string connectionString = "Provider=Microsoft.JET.OLEDB.4.0;data source=C:\\Northwind.mdb";
    OleDbConnection conn = new OleDbConnection(connectionString);
    string sql = "SELECT * FROM Orders";
                                          
    OleDbCommand cmd = new OleDbCommand(sql, conn);
    conn.Open();
    OleDbDataReader reader;
    reader = cmd.ExecuteReader();
    while (reader.Read()) 
    {
      Console.Write(reader.GetString(0).ToString() + " ," );
      Console.Write(reader.GetString(1).ToString() + " ," );
      Console.WriteLine("");
    }
    reader.Close();
    conn.Close();
  }
}

use an OleDbCommand object to read data from Access database

using System;
using System.Data;
using System.Data.OleDb;
class OleDbConnectionAccess {
    public static void Main() {
        string connectionString = "provider=Microsoft.Jet.OLEDB.4.0;data source=F:\\Program Files\\MicrosoftOffice\\Office\\Samples\\Northwind.mdb";
        OleDbConnection myOleDbConnection = new OleDbConnection(connectionString);
        OleDbCommand myOleDbCommand = myOleDbConnection.CreateCommand();
        myOleDbCommand.rumandText = "SELECT CustomerID, CompanyName, ContactName, Address FROM Customers WHERE CustomerID = "ALFKI"";
        myOleDbConnection.Open();
        OleDbDataReader myOleDbDataReader = myOleDbCommand.ExecuteReader();
        myOleDbDataReader.Read();
        Console.WriteLine("myOleDbDataReader[\" CustomerID\"] = " + myOleDbDataReader["CustomerID"]);
        Console.WriteLine("myOleDbDataReader[\" CompanyName\"] = " + myOleDbDataReader["CompanyName"]);
        Console.WriteLine("myOleDbDataReader[\" ContactName\"] = " + myOleDbDataReader["ContactName"]);
        Console.WriteLine("myOleDbDataReader[\" Address\"] = " + myOleDbDataReader["Address"]);
        myOleDbDataReader.Close();
        myOleDbConnection.Close();
    }
}

Use OleDbCommand to load data from Access database mdb

using System;
using System.Data;
using System.Data.OleDb;
class MainClass
{
  [STAThread]
  static void Main(string[] args)
  {
    string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\Northwind.mdb";
    string SQL = "SELECT * FROM Orders";
    OleDbConnection conn = new OleDbConnection(ConnectionString);
    OleDbCommand cmd = new OleDbCommand(SQL);
    cmd.Connection = conn;
    conn.Open();
    OleDbDataReader reader = cmd.ExecuteReader();
    while (reader.Read()) 
    {
      Console.Write("OrderID:"+reader.GetInt32(0).ToString() );
      Console.Write(" ,");
      Console.WriteLine("Customer:" + reader.GetString(1).ToString() );
    }
    reader.Close();
    conn.Close();
  }
}

OrderID:10330 ,Customer:LILAS
OrderID:10331 ,Customer:BONAP
OrderID:10332 ,Customer:MEREP
OrderID:10333 ,Customer:WARTH
OrderID:10334 ,Customer:VICTE
...
...