Gets or sets a value indicating whether the DateTimePicker.Value property has been set with a valid date/time value and the displayed value is able to be updated.
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This property is used to obtain the state of the check box that is displayed if the DateTimePicker.ShowCheckBox property value is true. If the DateTimePicker.Checked property value is true, the System.Windows.Forms.DateTimePicker control displays the properly formatted DateTimePicker.Value property value; otherwise, the control displays the last valid date/time value assigned to the DateTimePicker.Value property or the current date and time (DateTime.Now) if no value has ever been assigned.