XML Serializiation Migration To MySql

I have an ASP.NET project that uses XML Serialization for the main operation for saving data. This project was to stay small relative to size of data. However, the amount of data has ballooned as it always will and now I'm consider moving to a SQL based alternative for managing the data. For now I have multiple objects defined that are simply storage classes for saving my data for the project to work.
public class Customer

{
public Customer() { }
public string Name { get; set; }
public string PhoneNumber { get; set; }
}
public class Order
{
public Order() { }
public int ID { get; set; }
public Date OrderDate { get; set; }
public string Product { get; set; }
}

Something along these lines although not so rudimentary. Migrating to SQL seems to be a no-brainer and I've landed on using MySql because of the free availability of the service. What I'm running into is that the only way I can see to do this now is to have a solution where there is a storage class, Order, and a class built to Load/Save the data, OrderIO. The project relies heavily on using List<> to populate the data fields on the page. I'm not using any built-in .NET controls such as DataGrid to assist in displaying the data. Simple TextBox or ComboBox controls that are populated on Page_Load.

I'm aware it would make better sense to pick a way in which the data fields could bind to the SQL through a Repeater but I'm not looking at a full redesign, just a difference on the infrastructure to manage the data. I would like to be able to create a class that can return an object similar to what I'm dealing with now, such as List<>, from the SQL statements I'm executing. I'm having some trouble getting started on the best method of approach.