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CS0414#

The field 'foo' is assigned to but its value is never used

You have written to to a field, but the field was never accessed.

Resolution#

Either:

Finish writing your code, and read from the field.

_example.Method(); // Accessing the field by calling a method.
var value = _example.Value; // Accessing a member from the field.
var value = _example[0]; // Accessing an index from the field (if it was a collection).

Or

Remove the field if you are not planning to use it.

-private Example _example = new Example();

Or

If you are accessing the field via some other means—like reflection—you can mark it with the [UsedImplicitly] attribute.

[UsedImplicitly]
private Example _example = new Example();

Also note that you may also need to use the [Preserve] attribute if you are building using AOT (IL2CPP for example).