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I'm seeing different behavior between using .Equals and == between two of .NET 4.0's new Tuple<> instances. If I have overridden Equals on the object in the Tuple<> and call .Equals on the Tuples the override of Equals will be called. If I use == on the Tuples the override of Equals is not called. Is that by design and does it make sense? EDIT: From answers and comments I can tell I'm not being clear. I know Tuple<> is a reference type and that for reference types == will check identity (ReferenceEquals). But, should Tuple<> override == to check equality of the objects it contains? For consistency, probably not. For example if I have a simple object public class NameAndNumber { public int Number { get; set; } public string Name { get; set; } public override bool Equals(object obj) { if (obj is NameAndNumber) { NameAndNumber other = (NameAndNumber)obj; return Number == other.Number && Name == other.Name; } return false; } } and then I do something like this: Tuple<NameAndNumber, NameAndNumber> left = new Tuple<NameAndNumber, NameAndNumber>( new NameAndNumber { Name = "one", Number = 1 }, new NameAndNumber { Name = "two", Number = 2 }); Tuple<NameAndNumber, NameAndNumber> right = new Tuple<NameAndNumber, NameAndNumber>( new NameAndNumber { Name = "one", Number = 1 }, new NameAndNumber { Name = "two", Number = 2 }); bool operatorResult = left == right; bool equalsResult = left.Equals(right); Console.Out.WriteLine("operatorResult = {0} equalsResult = {1}", operatorResult, equalsResult); I get operatorResult = false equalsResult = true Should I be expecting that? I know the implementation of Equals on NameAndNumber isn't "right" it's just simplified sample code. I have also tried implemen

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