How to get Visitor IP Address and Location in ASP.Net

Question

 

I am using this code but this is not show Visitor IP Address 

 

string ipaddress;

ipaddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

if (ipaddress == "" || ipaddress == null)

{

ipaddress = Request.ServerVariables["REMOTE_ADDR"];

}

Response.Write(ipaddress);

 

Please help me