Custom membership provider

Hi,

I have been trying to follow some of the tutorials on this website to allow me to create a custom provider for usernames/passwords etc. for my website,

I have an existing database which is currently located in the APP_Data folder in my website.  A connection string has been created to allow connection to the db and this is working fine as all the data pages work ok.

I would like to use my exsisting DB to be the membership db,

I have ran aspnet_regsql and successfully added the membership schema to this db but I am having trouble configuring the custom provider in my web.config file. my web.config file is below

 <configuration>
<appSettings/>
<connectionStrings>
<add name="ASTECConnectionString" conn ...