The error message:
值不能為 null。 參數名稱: source
The error stack trace:
於 System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) 於 NoneLogon1.Page_Load(Object sender, EventArgs e) 於 d:\EEP2015\JQWebClient\NoneLogon1.aspx.cs: 行 51 於 System.Web.UI.Control.OnLoad(EventArgs e) 於 System.Web.UI.Control.LoadRecursive() 於 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
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