Server Error in '/' Application.

Value cannot be null.
Parameter name: String

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: String

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ArgumentNullException: Value cannot be null.
Parameter name: String]
   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.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.VisitOrderBy(Expression sequence, LambdaExpression expression, SqlOrderType orderType) +109
   System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +6808
   System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +71
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1114
   System.Data.Linq.SqlClient.QueryConverter.VisitTake(Expression sequence, Expression count) +447
   System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +7241
   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.Collections.Generic.IEnumerable<T>.GetEnumerator() +33
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +174
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +61
   AllThongBao.Page_Load(Object sender, EventArgs e) +900
   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


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0