Declaring and Using Nullable structs

You can make any value type nullable, allowing it to either be null or to contain one of its normal values.

Since user-defined structs are value types, you can also make any struct nullable, using Nullable<T> or T? notation.

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// Regular struct GuyInfo gi1 = new GuyInfo("Isaac", 1642);   // Nullable, with no value Nullable<GuyInfo> gi2 = null;   // Nullable, 2nd form, with value GuyInfo? gi3 = new GuyInfo("Albert", 1879);   bool hasVal1 = gi2.HasValue; bool hasVal2 = gi3.HasValue;

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