Get User IP Address using the ASP.Net C#

 Hello everyone, I am sharing  the code for end user machine using the ASP.Net C#.

public static string GetUserIPAddress()

{

  var request = System.Web.HttpContext.Current.Request;

  var ServerVariables_HTTP_X_FORWARDED_FOR =  (String)request.ServerVariables["HTTP_X_FORWARDED_FOR"];

 var ServerVariables_REMOTE_ADDR = (String)request.ServerVariables["REMOTE_ADDR"];

 var ServerVariables_UserHostAddress = HttpContext.Current.Request.UserHostAddress;

 var ServerVariables_HTTP_CLIENT_IP = (String)request.ServerVariables["HTTP_CLIENT_IP"];

 String ip = "";

 if (!string.IsNullOrEmpty(ServerVariables_HTTP_X_FORWARDED_FOR) &&  !ServerVariables_HTTP_X_FORWARDED_FOR.ToLower().Contains("unknown"))

  {

    ServerVariables_HTTP_X_FORWARDED_FOR = ServerVariables_HTTP_X_FORWARDED_FOR.Trim();

    string[] ipRange = ServerVariables_HTTP_X_FORWARDED_FOR.Split(',');

    ip = ipRange[0];

  }

  else if (!string.IsNullOrEmpty(ServerVariables_REMOTE_ADDR))

  {

    ServerVariables_REMOTE_ADDR = ServerVariables_REMOTE_ADDR.Trim();

    ip = ServerVariables_REMOTE_ADDR;

  }

  if (string.IsNullOrEmpty(ip))

  {

    if (!string.IsNullOrEmpty(ServerVariables_UserHostAddress))

    {

      ip = ServerVariables_UserHostAddress;

    }

    else if (!string.IsNullOrEmpty(ServerVariables_HTTP_CLIENT_IP))

    {

     ip = ServerVariables_HTTP_CLIENT_IP;

    }

  }

  if (!string.IsNullOrEmpty(ip)) 

  {

     if (ip.LastIndexOf(":") > 0) 

     {

          ip = ip.Substring(0, ip.LastIndexOf(":"));

     }

   }

 return ip;

}