I have read one article for Async file upload in ASP.NET here.
It is working till the .ashx file call but showing "context.Request.Files.Count" 0.

Can anyone help?
I have read one article for Async file upload in ASP.NET here.
It is working till the .ashx file call but showing "context.Request.Files.Count" 0.

Can anyone help?
You need to add enctype="multipart/form-data" to the HTML form, like this:
<form enctype="multipart/form-data">
OR
YourForm.Attributes.Add("enctype", "multipart/form-data");
You also need to verify that your HTML <input> of type file has a name attribute, like this:
<input type="file" name="MyFileInput" />