Show Or Get IP Address in ASP.NET MVC

Here's a simple tutorial on how to get a user's IP address using ASP.NET MVC and jQuery. The fetching of record is triggered when the textbox receives focus.
HTML Code

1	<input id="txtID" type="text" />

JavaScript Code

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$(document).ready(function () { $('#txtID').focus(function () { $.getJSON('@Url.Action("GetIPAddress","getipaddress")' , function (result) { $("#txtID").val(result); }); }); });

C# Code

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public JsonResult GetIPAddress() { System.Web.HttpContext context = System.Web.HttpContext.Current; string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; string output = string.Empty; if (!string.IsNullOrEmpty(ipAddress)) { string[] addresses = ipAddress.Split(','); if (addresses.Length != 0) { output = addresses[0]; } } else { output = context.Request.ServerVariables["REMOTE_ADDR"]; } return Json(output, JsonRequestBehavior.AllowGet); }