ASP .Net Database Access Layer Standards

In a professional ASP.Net programming world, an IT company should have standards on how to access the database on every programming tasks they have. We have already determined the SQL Database Standards. Now we need to determine how to access and use it in our ASP.Net Projects. But first we need to point out the following words:

• Datasets - a collection of DataTable objects that you can relate to each other with DataRelation objects. (MSDN)
  
• Database Factory - it is a compilation of codes which is used to access the database. Those functions/methods involved in the codes can be used all over again, thus, boosting the productivity of a programmer.
  
• Data Sources - is a representation of data.