asp.net updatepanel fileupload

FileUpload is not working within update panel
ASP.NET FileUpload in UpdatePanel - still not working
---
須要在 updatepanel 內的底部加入 :
YourControlID=確定儲存 (ADD & SAVE ID)
＜Triggers>
  ＜asp:PostBackTrigger ControlID="YourControlID" />
＜/Triggers>

---
PostBackTrigger 類別
裡面的事件寫法要注意!
不可加入 Handles  否則會跑2次! 若上傳檔案至DB會變成NULL
原則上 跑2次就不對了!

Protected Sub UploadButton_Click(ByVal sender As Object, ByVal e As EventArgs)

這樣寫法即可!