What are nullable types and how do you use them?

beginner

Re-explain

Nullable types allow value types to have null values. Useful for database scenarios where values might be undefined.

int? nullableInt = null;
bool? nullableBool = null;
// Checking for null
if (nullableInt.HasValue)
{
    int value = nullableInt.Value;
}
// Null coalescing operator
int result = nullableInt ?? 0; // Use 0 if null

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