Question

How to develop program/website and minimize DB dependencies using C#.NET?
For example I have made some changes in my DB, after that I must rewrite half a project.

Answer 1

The strategy it to split your application to a different logical layers abstracting the data storage layer from the business logic and UI.

So a simple example will be to have:

1. Data Layer – your database engine;
2. Data Access Layer – code which will know how to read and manipulate data from the Data Layer;
3. Business Layer – will know how to represent Data Access Layer object within your data domain;
4. Presentation Layer – to display/edit Business Layer objects.

For not very complex domains you can use technologies like LINQ to SQL or ADO.NET Entity Framework to act as 2-3 layers.