[InvalidOperationException: Nullable object must have a value.]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
MBSP.UserControls.Article.ArticleDetail.Page_Load(Object sender, EventArgs e) in D:\WORK\PROJECT\truongthinhvina.com.vn_hant_2018.10.12\truongthinhvina.com.vn\MBSP\MBSP\UserControls\Article\ArticleDetail.ascx.cs:20
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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