Summarizing the default behavior, Object.GetHashCode() works correctly for reference types, although it does not necessarily generate an efficient distribution. (If you have overridden Object.operator==(), you can break GetHashCode()). ValueType.GetHashCode() works only if the first field in your struct is read-only. ValueType.GetHashCode() generates an efficient hash code only when the first field in your struct contains values across a meaningful subset of its inputs.
GetHashCode() has very specific requirements: Equal objects must produce equal hash codes, and hash codes must be object invariants and must produce an even distribution to be efficient. All three can be satisfied only for immutable types.
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