session value retrievel

Revision 1
I have retrieved a value from database into session as
with query i got username from database into var p
then session["username"]=p.to string();

if i want to print the name into label
i write
label.text=session["username"].tostring();
it should print only username but it is printing column name too(like {username=aman})
what should i do?
remember i'm getting value from database