Public Event FilesUploadProgressChanged As FilesUploadEventHandler

Dim instance As UXFileUpload
Dim handler As FilesUploadEventHandler
 
AddHandler instance.FilesUploadProgressChanged, handler

public event FilesUploadEventHandler FilesUploadProgressChanged

public event FilesUploadProgressChanged: FilesUploadEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

public: __event FilesUploadEventHandler* FilesUploadProgressChanged

public:
event FilesUploadEventHandler^ FilesUploadProgressChanged