true if the synchronization between "Value" and "Text" should be done only on the Enter key press (and lost focus), otherwise false. By default, false.
Remarks
This property is only checked when the text is being typed in the TextBox. It affects the NumericUpDown, DateTimeUpDown, DateTimePicker, TimePicker, and TimeSpanUpDown controls.
In the case of DateTimeUpDown, DateTimePicker and TimePicker, this property is true by default and cannot be modified.
Requirements
Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2