using System.Data.OleDb;
...
OleDbConnection conn = new OleDbConnection(
"Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=C:\\database.mdb;" +
"Jet OLEDB:Database Password=password");
conn.Open();
OleDbCommand cmd = new OleDbCommand("select * from mytable", conn);
OleDbDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
Console.WriteLine(dr.GetString(0));
}
conn.Close();