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C# what is a question mark after a data type

Question mark after data type c#

Nullable types support a value type that can be assigned a null reference.

Nullable types can represent all the values of an underlying type, 
and an additional null value. Nullable types are declared in one of two ways:

( System.Nullable<T> variable )		or 		( T? variable  )

Source: grepper.com

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