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

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#?

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";

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`

You could create your own extension method much like the one in the [MVC code][1]

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");
}


[1]:

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Try to check if the ScriptManager [IsInAsyncPostBack][1] :

ScriptManager.GetCurrent(Page).IsInAsyncPostBack


[1]:

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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'`

I created an extension that I use:

internal static bool IsAjaxRequest(this HttpRequestMessage request)
{
return request != null && request.Headers.Any(h => h.Key.Equals("X-Requested-With", StringComparison.CurrentCultureIgnoreCase) &&
h.Value.Any(v => v.Equals("XMLHttpRequest", StringComparison.CurrentCultureIgnoreCase)));
}