el.c.

 

I think that is a bug , the attachments control would check the items while it loading the viewstate.

 

And that loadviewstate event if before the page_load, so please set that property in the init event:

 

 protected override void OnInit(EventArgs e)
 {
  base.OnInit(e);
  UploadAttachments1.TempDirectory = @"C:\Windows\Temp";
 }

 

Regards,

Terry