how check if session is null?

[lydia sista via DotNetMonster.com]

HI all how dya check if session is null or does not exist?

I tried using

if Session("cart")= null then
...
end if

this doesn't work it says 'null' is not declared. 'null' constant is no
longer supported. use 'system.dbnull' instead.

then when i use system.dbnull it says 'system.dbnull' is an object cannot
be used as an expression.

how to check this?
Thanks

 

[Hans Kesting]

HI all how dya check if session is null or does not exist?

I tried using

if Session("cart")= null then
..
end if

this doesn't work it says 'null' is not declared. 'null' constant is no
longer supported. use 'system.dbnull' instead.

then when i use system.dbnull it says 'system.dbnull' is an object cannot
be used as an expression.

how to check this?
Thanks

"null" is C#, DbNull.Value is the .Net representation of a database
(sql) null. In VB you want "Nothing".

I'm not sure about the VB syntax (I use C#) but try:
If Session("cart") Is Nothing Then ..
If IsNothing(Session("cart")) Then ..