asp.net - httpContext User Identity -

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i restrict user's access on website based on the user identity , used following code works fine in visual studio when publishing iis sending useridentity= null database. 

dim httpcontext__1 httpcontext = httpcontext.current dim winidentity system.security.principal.windowsidentity = directcast(httpcontext__1.user.identity, windowsidentity) dim useridentity string = winidentity.name  hasaccess = getuserfromdb(useridentity) if hasaccess     ' restrictions on  else end if

we need sure windows authentication enabled , anonymous authentication disabled.please see link


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