Ok, so I didn't access the upload file properties in the viewBiz_OnBeforeSave() method directly, instead I created a property, UploadFileName.
I used this as a guide:
clicky.
So, I added viewBiz.OnUploadFile += new EventHandler(viewBiz_OnUploadFile); to the SetupControl() method.
Then I created this:
void viewBiz_OnUploadFile(object sender, EventArgs e)
{
CMS.ExtendedControls.Uploader ctrlUploader = (CMS.ExtendedControls.Uploader)sender;
if (ctrlUploader != null)
{
_uploadFileName = ctrlUploader.PostedFile.FileName;
}
}
Lastly, in my viewBiz_OnBeforeSave() method, I validated the value of _uploadFileName.
I hope that helps anyone.
Matt