find IPAddress of the user's system

Introduction
In this code lets see how to find system or client machine IP address from which user visited the website in asp.net...


Description
Simply add label in .aspx page and write the below coding in pageload section

            
       protected void Page_Load(object sender, EventArgs e)
       {
            string ipadd = string.Empty;
            //"HTTP_X_FORWARDED_FOR" will return the user ipadd if client is behind proxy server          
            ipadd = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (string.IsNullOrEmpty(ipadd))
            {
                //"REMOTE_ADDR" will return the ipaddress of router                
                ipadd = Request.ServerVariables["REMOTE_ADDR"];
                Label2.Text ="your ipaddress is" + ipadd;
            
            }
       }

Conclusion
in this way we can check the user's ipaddress, either user is behind the proxy server or not