We help IT Professionals succeed at work.

How do I call vB methods inside C# in App_Code folder, same project?

Last Modified: 2013-12-17
I have a project that was made in VB by another programmer, and I need to work on that project in C# (since I have no knowledge of VB).

The project is structured as follows :

- Admin
** Test.aspx
- App_Code
-- CS_Code
** Object1.cs
-- VB_Code
** Object2.vb

 When I am in "Object1.cs", how do I create the object "Object2" that is located in the App_Code/Vb_Code folder?

Object2 = new Object2();

It does not see the Object2 at all.
Watch Question

Top Expert 2009

Place a "using" directive in the top of your Object1.cs. Code from different languages MUST reside in different assemblies. So, likely, your Namespace directives are different for the VB assembly.


I have tried the following :

In "App_Code/CS_Code/Class1.cs" :
namespace CS
    public class Class1
        public Class1()

In "App_Code/VB_Code/Class2.vb" :
Imports Microsoft.VisualBasic
Namespace VB
    Public Class Class2
    End Class
End Namespace

I can't access Class2 inside Class1. I tried "Using VB;" and it does not find the namespace.
Top Expert 2009

My apologies, I think I missed your point. You have different codeSubDirectories, right? With different languages. These cannot access one another, because there's officially no compiler dependency between the differen directories.

Not really an explanation, but still an answer, is here: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1666098&SiteID=1

I used to have these codeSubDirectories because some things are just easier in C#. Now I remember why I removed them one day and placed them in a separate project.

Sorry that I didn't have any better news for you ...

-- Abel --


What do you suggest for me to do in the scenario that "Class1" requires "Class2" to work?
Top Expert 2009
This one is on us!
(Get your first solution completely free - no credit card required)
Top Expert 2009

Note that if Class1 remains in the web application and Class2 goes into its own projects, that Class2 cannot access any members from Class1. However, Class1 *can* access as much members from Class2 as are public.

Circular dependencies are never allowed anyway (you'll need Java or Eiffel for that).
Top Expert 2009

Tx for the points, hope you get it working!

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.