Database Thread Closed?

Hello,

I have built a system, that uses a .dll file for all SQL operations. So a program looks something like this:

using myDLL;

....

SQLDBCON mSQL = new SQLDBCON();

and here comes the rest of the program.

My question is, the dll file has all stored procedures and when you declare mSQL as shown above, then it opens a thread to the database for that user.

Is that thread properly closed when the site has finished loading?

in my .aspx page i dont have a function like mSQL.CloseDB();

and if i try to add something like this to the dll file

~SQLDBCON {

m_local_con.Close();
m_local_con.dispose();

}

i get a error message says something that this is not allowed.

Just want to know if my thread in the dll file is properly closed?