[InvalidOperationException: Sequence contains no matching element]
System.Linq.Enumerable.Single(IEnumerable`1 source, Func`2 predicate) +488
danhmuc_category.Page_Load(Object sender, EventArgs e) in c:\webspace\dongagroup.vn\httpdocs\danhmuc\category.aspx.cs:40
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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