Csharp/CSharp Tutorial/ADO.Net/Access

Connecting To Access

<source lang="csharp">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();      
 }

}</source>

Connecting to a Microsoft Access Database

<source lang="csharp">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);
           }
       }
   }</source>

Connecting to a Password-Protected Microsoft Access Database

<source lang="csharp">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);
           }
       }
   }</source>

Read data from Access database

<source lang="csharp">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();
 }

}</source>

use an OleDbCommand object to read data from Access database

<source lang="csharp">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();
   }

}</source>

Use OleDbCommand to load data from Access database mdb

<source lang="csharp">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();
 }

}</source>

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