Access Denied Exception When Using DirectoryEntry

[Guest]

I get Access Denied
(System.Runtime.InteropServices.COMException) When trying
to
use DirectoryEntry on IIS via ASP.NET application. The
same code I use is not generating this Exception while
running in Console mode.
Sample Code :

DirectoryEntry obDirEntry = new DirectoryEntry
(IISPrefix + ComputerName + IISRoot, UserName, Password);

I tried also using impersonate in web config using admin
account but still the same problem.

Any Ideas ??? 10x.