RadAsyncUpload - Retain uploaded temp files during validation postback

[Jeff]

I'm using server side validation for certain controls on an asp.net web form page, which also contains a RadAsyncUpload control. 

When a user clicks save, I check to make sure these certain controls contain a value.  If this fails, we stop the save process and display a message to the user.  

During this process, any files to be uploaded are lost.  I need to retain them.

In the load event following this post back, the RadAsyncUpload control still has the uploaded files, but after fully loading the page, they're gone.

I'm already using the Post back Triggers property and this save button just happens to be the post back trigger.

How can I capture these files and "re-load" them into the control?

[Rumen]

Hi Jeff,

There is a similar forum thread that you might want to review: Retain uploaded files for display after postback.

Please also review the Uploaded File Persistence across Postbacks demo. See how the "Submit your picture information" button gets enabled after the comboboxes items are selected. Only when the Submit button performs the postback then the picture gets processed. Note how the comboboxes have applied AutoPostBack="true" and how the selected jpg image stays untouched during the postback in the asyncupload control.

Also, please ensure that you have set the EnableCustomValidation="true" property of RadAsyncUpload. This property specifies whether to fire the FileUploaded event and process the files if the Page is valid after the server-side validation events.  Remark: The control fires its event and processes the files if the Page is valid after the server-side validation events. If the Page is not valid, the uploaded files are persisted between postbacks.

Regards,
Rumen
Progress Telerik

[Jeff]

Brilliant!  It worked like a charm.  I used the javascript method to execute the additional hidden button from this forum post:

Retain uploaded files for display after postback

I went with a little bit different approach as I'm not using the Page.IsValid methods.  My server-side validation is completely manual.  However, I was able to retain my upload files across the several postbacks until I clicked the hidden button, which was set as the PostbackTriggers button.

As always, your responses are top notch and have solved my problem.  Cheers!