sir, 

On a Machine with VS2010 when trying to run asp.net aplication for the first time through IIS on login I am getting error 

Server Error in '/' Application.

An attempt to attach an auto-named database for file C:\Users\admin\Documents\Visual Studio 2010\WebSites\WebSite2\App_Data\aspnetdb.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

I am using Default Template and default membership system 

The connection in web.conf is as following. 

<add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />

Pl. guide to solve the problem.  

The application is running fine inside VISUAL STUDIO TEMPORARY INTERNAL SERVER . 

Thanks