[InvalidOperationException: Sequence contains no matching element]
System.Linq.Enumerable.Single(IEnumerable`1 source, Func`2 predicate) +542
HSEExpert.WebformApp.Pages.Common.Advertisement.AdvertisementPrices.Page_Load(Object sender, EventArgs e) +698
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +154
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4077
|