See Also: Nullable<T> Members - Documentation for this section
has not yet been entered. The Nullable<T> value type represents
a value of a given type T or an indication that the instance
contains no value. Such a nullable type is useful in a variety
of situations, such as in denoting nullable columns in a
database table or optional attributes in an XML element. The
runtime transforms Nullable<T>instances without values into true
nulls when performing a box operation; instances with values are
transformed into boxed T's containing the Nullable<T>'s Value.
An instance of Nullable<T> has two properties,
Nullable<T>.HasValue and Nullable<T>.Value. Nullable<T>.HasValue
is used to determine whether the current instance currently has
a value. It returns true or false, and never throws an
exception. Nullable<T>.Value returns the current value of the
instance, provided it has one (i.e., Nullable<T>.HasValue is
true); otherwise, it throws an exception. In addition to the
above properties, there is a pair of methods, b