error while running web project

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error when run web project
I write the address of my web site in browser as below:
http://localhost/my_vd/test_777/WebApplication1/WebApplication1/Default.aspx

my_vd is aliace of virtual directory . and I don’t publish my project (because I don’t know how can I publish I VS2010 – I don’t know how must I fill box service URL and site/application)
but it ask for username and password . why?
I disabled this option (Menu : tools -> folder option -> view -> use simple file sharing)
Therefore problems be solved
But I received this error :

Source Error:

Line 44:             ASP.NET to identify an incoming user.
Line 45:         -->
Line 46:         <authentication mode="form" />
Line 47:         <!--
Line 48:             The <customErrors> section enables configuration

Source File: C:\my_virtual_directory\test_777\webapplication1\webapplication1\web.config    Line: 46

[edit]Bold replaced with code block - OriginalGriff[/edit]

Posted 27-Apr-11 20:09pm

armm1388

Updated 27-Apr-11 20:25pm

OriginalGriff

v3

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NuttingCDEF · Answer 1 · 2011-04-27T21:08:00

This is not about file permissions / file sharing on your server, but about what authentication the ASP.NET framework demands when a web client makes an HTTP request to the IIS web server running your ASP.NET site.

See http://msdn.microsoft.com/en-us/library/532aee0e.aspx[^] for details of the authentication modes available.

This is about the <authentication> tage in line 46 of your web.config file (which should be in the <configuration><system.web> section of the web.config).

If you don't want to get the ASP.NET user / password form, you probably want either:

Windows authentication - in which case ASP.NET will use whatever authentication method (if any) is specified in your IIS management console, including allowing anonymous access if appropriate, or
None - which does exactly what it says (and leaves you free to do whatever you want for yourself in your own code)