Question

[A]System.Collections.Generic.Dictionary2[System.String,System.Collections.Generic.List1[DisplayAllQuestionsTable]]
cannot be cast to
[B]System.Collections.Generic.Dictionary2[System.String,System.Collections.Generic.List1[DisplayAllQuestionsTable]].
Type A originates from ‘mscorlib,
Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089’ in
the context ‘LoadNeither’ at location

My Dictionary syntax:

Dictionary<string, List<DisplayAllQuestionsTable>> tPages=tPages = 
   new Dictionary<string, List<DisplayAllQuestionsTable>>();

When i try to retrieve it from Session:

tPages = (Dictionary<string, List<DisplayAllQuestionsTable>>)Session["ThreadPage"]; // i get an exception here

Unable to cast object of type [

System.String

,System.Collections.Generic.List1[DisplayAllQuestionsTable]]' to type '**System.Collection**s.Generic.Dictionary2

Answer 1

Try to get the type of the Session[“ThreadPage”] object:

Session["ThreadPage"].GetType().ToString();