ss.cs

// Veri erişim kodumuz
class DataAccess
{
    private IDatabaseConnection databaseConnection;

    public DataAccess(IDatabaseConnection databaseConnection)
    {
        this.databaseConnection = databaseConnection;
    }

    public DataTable GetCustomerList()
    {
        databaseConnection.Connect("connection string");
        var dataTable = databaseConnection.ExecuteQuery("SELECT * FROM Customers");
        databaseConnection.Close();
        return dataTable;
    }
}