app.config for Office Addin

When you are developing a plugin office our settings should be saved in the app.config, but unfortunately this results in Excel.exe.config, Winword.exe.config, etc..

To solve this problem simply create a new .config file with the following name:
<pluginname>.dll

Visual Studio will create a new file called <pluginname>.dll.config and this is what our plugin will read, as evidenced by the following statement



Remember to set up file property to "Copy to output directory"

See MSDN page