VB.NET CAS error

[Justin Smith]

Hello...

I wrote 2 apps - one in vb.net, another in C#. Both apps are standard
windows apps. Each one loads a library when a button is pushed. At this
point, I have 1 vb.net exe and 1 vb.net dll as well as 1 c# exe and 1 c#
dll.

I deploy the C# and VB app over the web (localhost). Both load when I call
them. The problem enters when I load the dll. The VB app fails with a
security exception, but the C# app works properly.

The VB app will work when I give the app full trust. The first C# app does
not need full trust. Is there a library that is not marked with APTCA?
What CAS switch do I need to change to make this work for VB.net?

 

[Peter Huang]

Hi Justin,

Essentially, there is no difference between a VB.NET app with a c# app,
because they are all based on .net framework. After we compile the c# or
vb.net app, they are all compiled into MSIL language which is executed by
CLR engine.

So I think the problem may be caused by that the vb.net appliation are
doing different job than c# app.
I think you may try to compare the two apps and their dlls to see what is
the difference, maybe the vb.net app needs more permissions than c#.
Also here is a link you may take a look.
Security and Versioning Models in the Windows Forms Engine Help You Create
and Deploy Smart Clients
http://msdn.microsoft.com/msdnmag/issues/02/07/NetSmartClients/

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Justin Smith]

Thanks for the response. I was assuming that the Microsoft.VisualBasic
library did not allow partially trusted callers and that might be causing
the problem. I went this route after looking at the ILDASM results for the
same code generated with VB and C# - the results were not the same.

I did get around the issue finally - I cleared my download cache... I know
it sounds odd, but when I cleared the cache, the exact same library started
working as intended.

Unfortunately I did not back up the cache, so I cannot interrogate it for
clues. Have you ever heard of an issue along these lines that is resolved
by running gacutil -cdl?

 

[Peter Huang]

Hi Justin,

Do you mean the VB.NET app and dll have the same code with the C# app and
the dll?
But the VB.NET will produce the security error.
Can you provide a simple reproduce sample together with detailed
information, so that we can troubleshooting the problem on our side?
I did not find any problem related with the language specific error.

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Peter Huang]

Hi,

If you have any more concerns on it, please feel free to post here.


Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.