Message in Chinese (Traditional) (中文（繁體）)
要在伺服器發生未處理的例外狀況時傳送到用戶端的錯誤訊息。此屬性可以在頁面標記中以宣告方式設定，也可在 ScriptManager 的 AsyncPostBackError 事件期間設定。如果值為空白，則會使用例外狀況的訊息。
Unlocalized message
The error message to be sent to the client when an unhandled exception occurs on the server. The property can be set declaratively in the page markup or during the ScriptManager's AsyncPostBackError event. If the value is empty the exception's message will be used.
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