What are nullable types

Nullable types in C# are types that can represent all the values of their underlying value type plus an additional null value. This is particularly useful when dealing with databases and APIs where fields may not always have a value.

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            // Example of nullable types in C#
            int? nullableInt = null; // This can hold an integer or null
            Console.WriteLine(nullableInt.HasValue); // Output: False
            
            nullableInt = 5; // Assigning a value
            Console.WriteLine(nullableInt.Value); // Output: 5
            
            int nonNullableInt = 10;
            // nonNullableInt = null; // This will produce a compilation error