How to check if request is ajax or not in codebehind - ASP.NET Webforms

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I tried the Request.IsAjaxRequest but this does not exist in WebForms. I am making a JQuery ajax call. How do I check if this is a ajax request or not in C#?

You could create your own extension method much like the one in the MVC code

E.g.

public static bool IsAjaxRequest(this HttpRequest request)
{
    if (request == null)
    {
        throw new ArgumentNullException("request");
    }

    return (request["X-Requested-With"] == "XMLHttpRequest") || ((request.Headers != null) && (request.Headers["X-Requested-With"] == "XMLHttpRequest"));
}

HTHs, Charles

Edit: Actually Callback requests are also ajax requests,

    public static bool IsAjaxRequest(this HttpRequest request)
    {
        if (request == null)
        {
            throw new ArgumentNullException("request");
        }
        var context = HttpContext.Current;
        var isCallbackRequest = false;// callback requests are ajax requests
        if (context != null && context.CurrentHandler != null && context.CurrentHandler is System.Web.UI.Page)
        {
            isCallbackRequest = ((System.Web.UI.Page)context.CurrentHandler).IsCallback;
        }
        return isCallbackRequest || (request["X-Requested-With"] == "XMLHttpRequest") || (request.Headers["X-Requested-With"] == "XMLHttpRequest");
    }

[Resolved] How to identify requesting coming form ajax or not , How server is know that request is cumming form an ajax? /4392836/how-to- check-if-request-is-ajax-or-not-in-codebehind-asp-net-webforms. ASP.NET Core. This post is about detecting Ajax Requests in ASP.NET Core. In earlier versions of ASP.NET MVC, developers could easily determine whether the request is made via AJAX or not with IsAjaxRequest() method which is part of Request method. In this post I am implementing the similar functionlity in ASP.NET Core.

Try to check if the ScriptManager IsInAsyncPostBack :

ScriptManager.GetCurrent(Page).IsInAsyncPostBack

Detecting AJAX Requests In ASP.NET MVC 6, Previously, ASP.NET MVC applications could easily check if a request was being made via AJAX, through the aptly named IsAjaxRequest() method which was an available method on the Request object, as shown below: public ActionResult YourActionName() { // Check if the request is an AJAX call. It is possible to implement ajax with PHP or with JSP or with ASP.NET or with many other technologies. Since we are learning .NET, in this article we will explain ajax in the context of C# .NET. The experienced developer will say that there are two possible ways to implement ajax in an ASP.NET web application.

Generally, you will need to test for the X-Requested-With header, ensuring that its value is 'XMLHttpRequest'. I'm not a C# developer (yet), but a quick google search says that in C# it goes something like this:

Request.Headers["X-Requested-With"] == "XMLHttpRequest";

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Yes, Request.IsAjaxRequest looks at the headers and the querystring for X-Requested-With, but it seems your jquery isn't sending the X-Requested-With header.

You can try and see what headers it is sending by using Fiddler, or alternatively just send it in the querystring by setting the POST url to

/whatever.aspx?x-requested-with=XMLHttpRequest

Ajax requests to ASP.NET WebForms WebMethods are not captured , NET WebForm page with a single server-side WebMethod, and the following WebForms v1.0.1 The entirety of the code-behind is: using System; us _Default" %> <html> <head> <title>WebForm Ajax Test</title> <script� How to check if request is ajax or not in codebehind - ASP.NET Webforms. Ask Question Asked 9 years, How do I check if this is a ajax request or not in C#?

Decorate your class with [WebMethod(EnableSession = true)]syntax like if you write the following function in code behind and call the same function from ajax call you will be sure.

[WebMethod(EnableSession = true)]
    public static void   getData(string JSONFirstData,string JSONSecondData, string JSONThirdData, string JSONForthData, ...)
    {
       //code
    }

in Ajax URL be like URL :'/Codebehind.aspx/getData'

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Comments
  • That last line can be refactored to return request["X-Requested-With"] == "XMLHttpRequest" || request.Headers["X-Requested-With"] == "XMLHttpRequest";
  • added is callback support
  • Does this work for ajax requests that are triggered both from jquery ajax as well as from controls such as Update panels?
  • I'm not sure, therefore i wrote try;-)
  • JQuery is sending the X-Requested-With so if I check the headers per Karim79, it works. But there Request does not have a IsAjaxRequest property in the base page.
  • Ah, I see - i thought you meant it was always false. What version of ASP.net are you using, and could we all see some code to reproduce your issue?