What is the easiest way to migrate existing login to asp.net membership?

I have an existing site with simple authentication (through a database) and I want to change it to asp.net membership.

My exisiting login calls a stored procedure that returns the user id and other relevant details if user and password matches. I then store those to the session and each of my "secured" pages checks for the session variables to determine if they are an authenticated user.

Please note that the passwords currently are NOT encrypted.

There could be lots of solutions here so it would be better if there's a brief explanation of why I should do it your way.
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Easwaran ParamasivamCommented:
The best way to keep your underlining database and your exisiting code is to create a Custom Membership provider. You can call of your exisitng code from your provider to update/add/remove users then you can get all the functionalty from the Memebership API and cool login controls while keeping your database intact.

A quick vid on how to implement it: http://channel9.msdn.com/ShowPost.aspx?PostID=180276

Some articles:

Implementing a Membership Provider

Writing a Custom Membership Provider for the Login Control in ASP.NET 2.0

Writing A Custom Membership Provider for your ASP.NET 2.0 Web Site


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