[FormatException: Input string was not in a correct format.]
System.Data.Linq.SqlClient.QueryConverter.VisitInvocation(InvocationExpression invoke) +504
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1467
System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +31
System.Data.Linq.SqlClient.QueryConverter.VisitBinary(BinaryExpression b) +37
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +520
System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +31
System.Data.Linq.SqlClient.QueryConverter.VisitBinary(BinaryExpression b) +23
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +520
System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +31
System.Data.Linq.SqlClient.QueryConverter.VisitWhere(Expression sequence, LambdaExpression predicate) +134
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +4785
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +71
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1114
System.Data.Linq.SqlClient.QueryConverter.VisitFirst(Expression sequence, LambdaExpression lambda, Boolean isFirst) +32
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +582
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +71
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1114
System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression node) +105
System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations) +119
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +138
System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +58
System.Linq.Queryable.SingleOrDefault(IQueryable`1 source) +220
Mesnevi.Page.Page_Load(Object sender, EventArgs e) +1673
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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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