A simple helper for implementing GetHashCode().

HashExtensions.cs

namespace Helpers
{
	// Used like:
	// public override int GetHashCode() {
	//   return 17.CombineHashWith(foo).CombineHashWith(bar).CombineHashWith(GetType());
	// }
	public static int CombineHashWith<T>(this int initialHash, T other)
	{
		var otherHash = other == null ? 0 : other.GetHashCode();
		return initialHash + initialHash * 23 + otherHash;
	}
}