~~~~~~~~~~~~~~~~~~~~~~~~~
If Session("PendingOp") Is Nothing _
Then Session("PendingOp") = "Null"
If Session("PendingOpFlag") Is Nothing _
Then Session("PendingOpFlag") = False
If Session("Accum") Is Nothing _
Then Session("Accum") = 0
~~~~~~~~~~~~~~~~~~~~~~~~~
The same "PendingOp" line of code we saw earlier would actually be coded this way
Session("PendingOp") = tag
Again, use the Find function in Visual Studio to check the use of the three variables in question and recode them as session variables instead. (Don't use "Replace All" ... you'll change more than you want to change.)
NOW run your app again. Does it work? This time it SHOULD work correctly! But if you're still having trouble, you the full source code can be found HERE.
There are a lot of critical ideas in this simple example and if you understand the whole thing, you've got the very heart of ASP.NET.
Congratulations!
