Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

在UpdatePanel裡設定一個按鈕
可以下載 把Excel (GridView轉Excel)
這樣會錯

Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.



解決方法:
UpdatePanel的Triggers中可以加入一個PostBackTrigger 
指定你這個Button的Click事件也行

<Triggers>
          <asp:PostBackTrigger ControlID="btnExcel" />

</Triggers>