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What would be the difference (if any) and advantages/disadvantages between these two properties used to determine the user agent?
Dim strUserAgt as String
userAgent = Request.userAgent
vs.
Dim strUserAgt as String = Request.ServerVariables("HTTP_USER_AGENT")
Source: How to determine browser type in server-side code without the BrowserType object in ASP.NET
There are no difference, both will retrieve same thing
HTTP_USER_AGENT header value.Check Request.ServerVariables Collection and IIS Server Variables if you want to dig it in deep. These server variables collection values somewhat depend ond the IIS version also.