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I'm continuing my study of C# and the language specification and Here goes another behavior that I don't quite understand: The C# Language Specification clearly states the following in section 10.4: The type specified in a constant declaration must be sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, decimal, bool, string, an enum-type, or a reference-type. It also states in section 4.1.4 the following: Through const declarations it is possible to declare constants of the simple types (§10.4). It is not possible to have constants of other struct types, but a similar effect is provided by static readonly fields. Ok, so a similar effect can be gained by using static readonly . Reading this I went and tried the following code: static void Main() { OffsetPoints(); Console.Write("Hit a key to exit..."); Console.ReadKey(); } static Point staticPoint = new Point(0, 0); static readonly Point staticReadOnlyPoint = new Point(0, 0); public static void OffsetPoints() { PrintOutPoints(); staticPoint.Offset(1, 1); staticReadOnlyPoint.Offset(1, 1); Console.WriteLine("Offsetting..."); Console.WriteLine(); PrintOutPoints(); } static void PrintOutPoints() { Console.WriteLine("Static Point: X={0};Y={1}", staticPoint.X, staticPoint.Y); Console.WriteLine("Static readonly Point: X={0};Y={1}", staticReadOnlyPoint.X, staticReadOnlyPoint.Y); Console.WriteLine(); } The output of this code is: Static Point: X=0;Y=0 Static readonly Point: X=0;Y=0 Offsetting... Static Point: X=1;Y=1 Static readonly Point: X=0;Y=0 Hit a key to exit... I really expected the compiler to give me some kind of warning about mutating a static readonly field or failing that, to mutate the field

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