Problem using dll in Asp.net

Hi all
it is my firist post on this forum but i have a case that i need help in it
I am using a dll object to create temp tables on SQL Server to view Some Crystal Reports on the web.
The structure of the temp table is each part represent a part of the tmp table name :
1) ##
2) the table name for example salereport
3) the session ID in which the user take on logon to the database example 50
So as example my temp table will look like ##salereport50.
Every thing goes so fine until the Session ID Changes the temp table is created but it is not filled with data. and i have to stop the IIS and start it again for the temp table to be filled and the reports to get data.

Can any one help me telling me what is hapening Knowing that the same code of the dll works so fine with VB6 and VB.net When inisialized in both Languages.