What is a nullable type?

What is a nullable type?

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A nullable type is a value type that can represent all range of values of its underlying value type. In addition, a null value can also be assigned to the value type. For example:

Nullable<byte> val;
This code snippet means the byte value data type can be assigned to any value ranges from 0 to 255.

Nullable<byte> val = null;
This code snippet means the byte value data type can be assigned to a null value.

In C# language specification, the following is the shorthand notation for the nullable type:
byte? val = null;

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