User Management DB and my own DB

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C#

ASP.NET

SQL

SQL-Server

C#4.0

, +

I have my own database which i am using in my project and for User Management i am using Built in Database (with built in Login tools) of aspnetDB.
Now my question are:

1: Using two database (in a project) 1 for User Management and 2nd DB for application Functionality. Is this technique is right??

2: if this technique is not right then what i need to do marge both database into one DB??

3: and if i merge both database in to one DB, then what are the steps ??


opinion and guidance require.