Is it possible to call two different session from 2 different click event.After a long try I'm finding it difficult to handle two sessions retrived from 2 different click event.Only one of them works.IF both sessionsa are called like

string name = session["name"].tostring();
string dept = session["dept"].tostring();

it throws error saying "Object reference not set to an instance"

if either one is used then it's ok.
Any suggestions ?