Get IPAddress C# [closed]

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How do I get the HTTP_X_FORWARDED_FOR Ip Address?

1. HTTP CLIENT IP

   HttpContext.Current.Request.UserHostAddress.ToString();

2. HTTP X-FORWARDED FOR //proxy ip address

   ?

3. REMOTE ADDRESS

   ?

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see http://msdn.microsoft.com/en-us/magazine/cc163692.aspx for retrieving the so-called "server-variable" HTTP_X_FORWARDED_FOR from a http request...

For an explanation see http://forums.asp.net/t/1138908.aspx