C# 0 The Complete Reference

null

. For example, using 

count

 declared by the 

preceding statement, the following determines if it has a value:

if(count != null) // has a value

If

count

 is not 

null

, then it contains a value.

The second way to determine if a nullable type contains a value is to use the 

HasValue

read-only property defined by 

Nullable

. It is shown here:

bool HasValue

HasValue

 will return true if the instance on which it is called contains a value. It will return 

false otherwise. Using the 

HasValue

 property, here is the second way to determine if the 

nullable object 

count

 has a value:

if(count.HasValue) // has a value

Assuming that a nullable object contains a value, you can obtain its value by using the 

Value

 read-only property defined by 

Nullable

, which is shown here:

T Value

It returns the value of the nullable instance on which it is called. If you try to obtain a value 

from a variable that is