[NullReferenceException: 並未將物件參考設定為物件的執行個體。]
TrackingSystem_EN.Page.Page_Load(Object sender, EventArgs e) in C:\Users\User\source\repos\dotnetCore\TrackingSystem_EN\Page.aspx.cs:34
System.Web.UI.Control.OnLoad(EventArgs e) +105
System.Web.UI.Control.LoadRecursive() +67
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3784
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