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Server error in "/" application. To solve

Time:09-24

[NullReferenceException: the object reference not set to an instance of an object,]
System. Data. Linq. SqlClient. QueryConverter. VisitInvocation (InvocationExpression invoke) + 490
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 1424
System. Data. Linq. SqlClient. QueryConverter. VisitExpression (Expression exp) + 30
System. Data. Linq. SqlClient. QueryConverter. VisitBinary + 35 (BinaryExpression b)
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 505
System. Data. Linq. SqlClient. QueryConverter. VisitExpression (Expression exp) + 30
System. Data. Linq. SqlClient. QueryConverter. VisitBinary + 35 (BinaryExpression b)
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 505
System. Data. Linq. SqlClient. QueryConverter. VisitExpression (Expression exp) + 30
System. Data. Linq. SqlClient. QueryConverter. VisitWhere (Expression sequence, LambdaExpression predicate) + 128
System. Data. Linq. SqlClient. QueryConverter. VisitSequenceOperatorCall MethodCallExpression (MC) + 4624
System. Data. Linq. SqlClient. QueryConverter. VisitMethodCall MethodCallExpression (MC) + 69
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 1081
System. Data. Linq. SqlClient. QueryConverter. VisitSelect (Expression sequence, LambdaExpression selector) + 25
System. Data. Linq. SqlClient. QueryConverter. VisitSequenceOperatorCall MethodCallExpression (MC) + 1921
System. Data. Linq. SqlClient. QueryConverter. VisitMethodCall MethodCallExpression (MC) + 69
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 1081
System. Data. Linq. SqlClient. QueryConverter. VisitOrderBy (Expression sequence, LambdaExpression Expression, SqlOrderType orderType) + 107
System. Data. Linq. SqlClient. QueryConverter. VisitSequenceOperatorCall MethodCallExpression (MC) + 6568
System. Data. Linq. SqlClient. QueryConverter. VisitMethodCall MethodCallExpression (MC) + 69
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 1081
System. Data. Linq. SqlClient. QueryConverter. VisitAggregate (Expression sequence, LambdaExpression lambda, SqlNodeType aggType, Type returnType) + 81
System. Data. Linq. SqlClient. QueryConverter. VisitSequenceOperatorCall MethodCallExpression (MC) + 5414
System. Data. Linq. SqlClient. QueryConverter. VisitMethodCall MethodCallExpression (MC) + 69
System. Data. Linq. SqlClient. QueryConverter. VisitInner (Expression node) + 1081
System. Data. Linq. SqlClient. QueryConverter. ConvertOuter (Expression node) + 100
System. Data. Linq. SqlClient. SqlProvider. BuildQuery (Expression query, SqlNodeAnnotations annotations) + 114
System. Data. Linq. SqlClient. SqlProvider. System. Data.. Linq Provider. IProvider. Execute (Expression query) + 132
System. Data. Linq. DataQuery ` 1 System. Linq. IQueryProvider. Execute (Expression Expression) + 23
System. Linq. Queryable. Count (IQueryable ` 1 source) + 196
Line6_Fault. ShowData (Boolean sc) + 4441
Line6_Fault. Page_Load (Object sender, EventArgs e) + 1160
System. Web. Util. CalliEventHandlerDelegateProxy. Callback (Object sender, EventArgs e) + 51
System. Web. UI. Control the onl oad (EventArgs e) + 95
System. Web. UI. Control. LoadRecursive () + 59
System. Web. UI. Page. ProcessRequestMain (Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) + 678

CodePudding user response:

Your Linq query to the data, specific code can look at the following two lines to look around to
 
Line6_Fault. ShowData (Boolean sc) + 4441
Line6_Fault. Page_Load (Object sender, EventArgs e) + 1160

CodePudding user response:

Debugging, learn to debug, you learn the essence
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