I have done the following: Created ContractInterface in ContractProject Created WCFServiceClass in WCFServiceProject which

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Editorial Team

Asked: May 20, 20262026-05-20T17:56:29+00:00 2026-05-20T17:56:29+00:00

I have done the following:

Created ContractInterface in ContractProject
Created WCFServiceClass in WCFServiceProject which implements ContractInterface with all needed connection definitions:

enter image description here

Created ClientProject with all the needed wrappers
Created ConsoleApplication in same solution with all connection definitions and programm which creates client and invokes the wrapper methods.
Ran the Console application with Visual studio 2010 like this:
a. Start Service application
b. ConsoleApplication
and it works just fine.
Then I created Excel addin in different solution and referenced ContractProject and Client project with same connection definitions as previous Console application which worked:

enter image description here

Ran the addin in Visual Studio 2010 like this:
a. Start Service application in one instance of Visual Studio 2010
b. Start Addin in different instance of Visual Studio

And I had a following massage:

enter image description here

Can you please tell me what do i do wrong?

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Editorial Team · Answer 1 · 2026-05-20T17:56:29+00:00

You can either do what the configuration file is doing by programmatically instantiating the service.

Or you can try creating an excel.exe.config file in the same directory as excel and putting your configuration in that file.

I would go with the first approach!

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