How to tell if an object has been released

The following are the referenced contents: <% Dim Conn ' statement Set conn = Server.CreateObject ("ADODB. Connection ")" Create ' Use Set conn = Nothing ' free %>

We usually create an object in the form of, and use and release it, the question is how do we determine if an object has been released? Can I use IsObject? Let's try the following:

The following are the referenced contents: <% Dim Conn Response.Write (IsObject (conn)) ' result is false Set conn = Server.CreateObject ("ADODB. Connection ") Response.Write (IsObject (conn)) ' result is true Set conn = Nothing Response.Write (IsObject (conn)) ' result is true %>

Visible and can not use IsObject to determine whether an object has been released, then we use the VarType or TypeName function to try:

The following are the referenced contents: <% Dim Conn Response.Write (TypeName (conn)) ' Results empty Set conn = Server.CreateObject ("ADODB. Connection ") Response.Write (TypeName (conn)) ' Results connection Set conn = Nothing Response.Write (TypeName (conn)) ' Results nothing %>

So, to judge whether an object is released we apply:typeName (conn) = "Nothing"(must use nothing can not have nothing, lowercase result is not true, is the ASP also case-sensitive?)