As stated earlier, the conventions are the same with C# custom DSC resources as MOF-based custom DSC resources, and that applies to the folder structure as well. The only thing actually different is that you put the DLL in place of the .psm1 file:

powershell
$env:ProgramFilesWindowsPowerShellModules
 |- xExampleThingDSCResource
 |- xExampleThingDSCResource.psd1
 |- DSCResources
 |- xExampleThing
 |- xExampleThing.psd1 (optional)
 |- xExampleThing.dll (required)
 |- xExampleThing.schema.mof (required)

Once that is done, deployment is the same as any other DSC resource described in this book.