Inegrating WSS 3.0 itno ASP.net application with existing DB With FBA

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ASP.NET

SharePoint

Hello Techies

Here i have an Query.
I have one asp.net application,In that application i integrate WSS 3.0 document library.In asp.net application am doing uploading files from asp,net application into WSS3.0 Document Library, And I display Document Library in asp.net application and doing the check in check out process,version all these things are done by web services. and ASp.net have separate DB is there and i access the WSS 3.0 With window authentication.Now i need to do all the operations with Form Based Authentication along with existing DB also i suppose to use the existing user.with single sign on process

Here i found lots of articles to create a new sharepoint site with Form Based Authentication also it move with new db with the following tables
aspnet_Applications,aspnet_Membership,aspnet_Paths,aspnet_PersonalizationAllUsers,
aspnet_PersonalizationPerUser,aspnet_Profile,aspnet_Roles,aspnet_SchemaVersions,
aspnet_Users,aspnet_UsersInRoles,aspnet_WebEvent_Events.

Here how i should create a new users? I dont have any clear ideat about it


Thanks in advance

Sathish Kasinathan