In asp.net ,"excel.application"cant create ,it displayed "Rfuse Access"

From: Michael Twua (mts_xp_at_263.net.discuss)
Date: 05/25/04 

Date: Tue, 25 May 2004 10:51:18 +0800

In asp.net with vb.net,I can't create a excel object,such as
excel.application,excel.workBook,excel.work***.
It displayed that "System.UnauthorizedAccessException Refuse Access". I have
import "Microsoft Excel9.0 Object Library", aspnet user have all data
operation.

What Problem it is?How to resolve this problem?