I've got a C# class that is all string types, nothing fancy, and once the item is created it gets serialized with the new System.Text.Json stuff and then attempts to POST to a web server.

I'm trying to write a simple C# (.NET 1.1) class with a couple of properties. One of the properties is going to be SiteGuid, which relates to the SiteGuid of a SharePoint SPSite object. The ...