The NullableDateTimePicker class inherits from DateTimePicker.
The functionality is implemented via 2 new properties: NullValue and AllowNullValues.
· NullValue is an actual DateTime value that is used by the application to represent null. By default, this is set to 01/01/01, but can be changed programmatically.
· AllowNullValues is a boolean which indicates whether or not null values are allowed.

For example: objNullableDateTimePicker.Value = null;
Executing the above statement has the following consequences:
· If AllowNullValues is true, the Value property will be set equal to the NullValue property, otherwise an ArgumentNullException is thrown.
· Trying to set AllowNullValues to false when the Value property is equal to the NullValue throws an ArgumentException.

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