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The OnClientFilesSelecting occurs when the files are just about to be processed.

The event handler receives two parameters:

  1. The instance of the RadCloudUpload control firing the event.

  2. An eventArgs parameter containing the following methods:

  • get_count returns the count of the selected files.

  • set_cancel lets you cancel the event and prevent items from being uploaded

<telerik:RadCloudUpload runat="server" ID="RadCloudUpload1" OnClientFilesSelecting="onClientFilesSelecting" MultipleFileSelection="Automatic" ...>
function onClientFilesSelecting(sender, eventArgs) {
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