Question: I'm just starting a new project on ASP.NET MVC and this will be the first project actually using this technology. As I created my new project with Visual Studio 2010, it created to my sql server a bunch of tables with "aspnet\_" prefix. Part of them deal with the built-in user accounts and permission support. 

Now, I want to keep some specific information about my users. My question is "Is it a good practice changing the structure of this aspnet\_ tables, to meet my needs about user account's information?". 

And as i suppose the answer is "No." (Why exactly?), I intend to create my own "Users" table. What is a good approach to connect the records from aspnet\_Users table and my own custom Users table. 

I want the relationship to be 1:1 and the design in the database to be as transparent as possible in my c# code (I'm using linq to sql if it is important). Also, I don't want to replicate the usernames and passwords from the aspnet\_ tables to my table and maintain the data. 

I'm considering using a view to join them. Is this a good idea?

Thanks in advance!

EDIT: From the answer, I see that I may not be clear enough, what I want. The question is not IF to use the default asp.net provider, but how to adopt it, to my needs.

Answer: 
If you are choosing to use the Membership API for your site, then this [link](http://www.asp.net/(S(pdfrohu0ajmwt445fanvj2r3))/learn/security/tutorial-08-cs.aspx) has information regarding how to add extra information to a user.

I was faced with the same scenario recently and ended up ditching the membership functionality and rolled my own db solution in tandem with the DotNetOpenAuth library.
Using the membership system in asp.net has its advantages and drawbacks. It's easy to start, because you don't have to worry about validation, user registration, resetting passwords. (Be careful if you plan to modify the table structures, you will have to change them in the views/store procedures generated

**However there are drawbacks to using Membership**
You will have to maintain 2 separated systems, because the Membership API has restrictions, for example, you cannot perform operations inside a transaction with the membership api. (Unless you use TransactionScope i think, but you don't have other choices).

A valid alternative would be to implement your own security validation routines, and using FormsAuthentication. This way you will have total control over your users tables, and remove dependency to the membership API.