Unable to understand “A field initializer cannot reference the nonstatic field” Error?

Isn't it because the order of initilization when used as a field is not defined, ie selectedItems could be initialized before selectedItem, which would result in an error (or at least in unexpected behaviour, that selectedItems was null). In the second example the order is specific so everything is hunky dory.

It isn't the static field that's the problem. It's the attempt to use the non-static field selectedItem in the initialization of another non-static field selectedItems. This is a restriction in C#.

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