Vista - problem in accessing a wcf service through wpf-xaml

hi,

i am hosting a WCF service on IIS and i am accessing that service through
WPF-XAML application.

in XAML application i included both app.config and autogrnerated.cs file and
i am able to build the application successfully but when i am executing the
XAML application i am getting an error: stating that,



System.Security.SecurityException was unhandled
Message: That assembly does not allow partially trusted callers.






but when i access the wcf service through WCF client i can perfectly execute
the application



what might be the reason for this and what should i do to solve this problem.

(i also checked by writing [assembly: AllowPartiallyTrustedCallers] in the
assebly.cs file of the WCF service, still iam getting same error)


thanks,


--
reddy