Occurs on the client side before file upload is started.
The FilesUploadStart event handler receives an argument of the ASPxClientUploadControlFilesUploadStartEventArgs type. The following properties provide information specific to this event.
|cancel||Gets or sets a value indicating whether the action which raised the event should be canceled.|
Each time files are going to be uploaded on the client side, the FilesUploadStart event occurs, allowing you to cancel the action.
To cancel the upload operation, set the ASPxClientUploadControlFilesUploadStartEventArgs.cancel property to true.
After a file has been uploaded, the ASPxClientFileManager.FileUploaded event is raised.