In .NET, if a symbol has no explicit access modifiers, it defaults to the most private allows for that symbol (internal for namespace members, private for everything else). We currently rely on this behavior and omit access modifiers wherever possible.

However, we are switching to the .NET Core Coding Style Guide for .NET style. The guide specifies:

5. We always specify the visibility, even if it's the default (e.g. private string _foo not string _foo). Visibility should be the first modifier (e.g. public abstract not abstract public).