Interface Programming: Entity Wrapper to Handle Dynamic Source Object

Background

During working with legacy code, I have found that many people used DataTable/DataSet instead of strongly typed objects. They are using some code like

string id = row["id"].ToString();

instead of

string id = request.Id;

It is becoming a maintenance hell because of several reasons:

• I do not know the data type from database, so I need to debug into database procedure
• I do not know whether the data is nullable or not, again I need to debug into database
• When I need to change the data type, I need to search for every implementation, change it and make sure it does not break 

And last but not least, if I want to make enhancements or modifications, I have been faced with 2 options:

• Keep  the same programming style, using the DataTable, with the risk that you add another more maintenance hell object
• Refactor it, with the risk of breaking is higher

I want to use Dependency Injection (DI) for my further development. Lack of strongly typed entities are of course prevent me from using DI. So I need to change the DataTable to strongly typed object before using the DI implementation.