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Possible Duplicate:
What is the difference between const and readonly?
are these interchangeable? can you show me code on how you would apply the two?
No, they aren’t.
A
constfield is literal value embedded in the assembly.Only primitive values (strings and numbers) can be
const, and they are evaluated at compile time.When you reference a
constfield, the compiler embeds the literal value of the field. Therefore, if use use aconstfrom another assembly, and the other assembly is recompiled with a different value, your assembly will only use the new value if you recompile it against the new version.A
readonlyfield is a normal field that cannot be changed outside the constructor.