c# - Merge .net configuration files

Question

My application has 2 config files at the moment.

1. App.config
2. Custom.config

The App.config references the Custom.config via a custom section handler like below:

<configuration> <configSections>
<section name="Custom" type="MyApp.CustomConfigSection, MyApp" /> </configSections> <Custom configSource="Custom.config" /> </configuration>

The problem is the Custom.config file contains a single section with many elements. I'd like to split this out so some of the elements are in one file and some are in another.

e.g. Right now I have

'<Custom>
     <Group1 ../>
     <Group2 ../>
     <Group3 ../>
</Custom>

I'd like to make 2 or more files like below.

'<Custom>
    <Group1 ../>
 </Custom>'

'<Custom>
     <Group2 ../>
     <Group3 ../>
 </Custom>'

At the moment I call ConfigurationManager.GetSection("Custom") as MyCustomConfigSection. I then have a number of classes with various configuration attributes that are populated automatically by the .net configuration.

Is there a way to do this split or can you not split 1 section into multiple files?

Thanks in advance