That resolves two of the three things I posted. Using the longer form of the key in the web.config file is working, and I had missed the args.delete method (the volume of the files is high enough that we don't want them sticking around for 5 hours). Thanks!

 

 

As for the third thing, I don't think I was clear in what I was asking. I don't want to cancel the file upload using server side code. I want to execute server side code immediately after the USER clicks the cancel button.

 

For example, I see in the documentation that the Uploader class has the OnUploadCompleted instance method that is executed when a file upload finishes. There are also a number of other instance methods associated with the Uploader. Can you tell me if any of them are called when the user clicks the Cancel button?  I'm simply trying to figure out how to hook a method in my codebehind into the cancel event.

 

I could write a custom clientside JS to handle this, but I'm hoping that there's something built in.