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Possible Duplicate:
The type ‘string’ must be a non-nullable type in order to use it as parameter T in the generic type or method ‘System.Nullable<T>’
As the title says, why are strings nullable by default in C#, but if I want, say, ints or doubles to be null, I have to explicitly say so?
Because string is a reference type, deriving from
objectand [most] other default types are value types, deriving implicitly from System.ValueType;