AJAX :: Async File Upload Control - Check File Contenttype Before File Upload Starts?

Jan 13, 2010

I am using the async file upload control to upload to a image file. I want the user to upload only jpg files. And for that I am checking the uploadedfile content type in server side, after the upload complets. I wanna check this, before upload starts. There is one javascript method

function startUpload(sender, args){}

but how to access the content type of the file selected by user.

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