Why doesn't C# offer constness akin to C++?

Question

References in C# are quite similar to those on C++, except that they are garbage collected.

Why is it then so difficult for the C# compiler to support the following:

Answer 1

I wouldn't be surprised if immutable types were added to a future version of C#. There have already been moves in that direction with C# 3.0.

Anonymous types, for example, are immutable.

I think, as a result of extensions designed to embrace parallelism, you will be likely to see immutability pop up more and more.