To add to what Gerry has - rightly - said, you can't assign a value to a
const field unless it can be evaluated as a constant value at compile time. Since the
new operator constructs an instance on the heap while your code is running, you cannot use that to assign a
const value.
readonly will do it, since it can only be assigned a value in the declaration line or in the containing class constructor:
readonly keyword - C# Reference | Microsoft Docs[
^]
The other solution is to create a property with either a
private setter, or no setter at all and a constant value returned in the getter - but that's messy.
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