How did you find that article? That article is from 2001. The framework has changed considerable since then. Anyway here is an example using version 2.0 of the .NET Framework.

Code:
public void ReadMyData(string connectionString)
{
    string queryString = "SELECT OrderID, CustomerID FROM Orders";
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            Console.WriteLine(reader.GetInt32(0) + ", " + reader.GetString(1));
        }
        // always call Close when done reading.
        reader.Close();
    }
}
This example shows how to read from the database. But if you read the documentation for the OleDbCommand you'll see the methods that it has for updating. I assume you have MSDN installed. If you don't you can access it on the msdn website.