At the moment RadAsyncUpload does not expose API, that allow you to modify header of the request. Are you using this library - AntiCSRF
? We need this information in order to make a deeper research with our code base and try to provide you an example that could solve your case.
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to the blog feed