[InvalidOperationException: The cast to value type 'Int32' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type.]
System.Data.Common.Internal.Materialization.ErrorHandlingValueReader`1.GetValue(DbDataReader reader, Int32 ordinal) +165
lambda_method(Closure , Shaper ) +1188
System.Data.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper) +366
System.Data.Common.Internal.Materialization.SimpleEnumerator.MoveNext() +91
System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +146
TatilTurSitesi.TurDetay.Page_Load(Object sender, EventArgs e) in D:\Marenova\TatilTurSitesi\TatilTurSitesi\TurDetay.aspx.cs:55
System.Web.UI.Control.OnLoad(EventArgs e) +106
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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