'Declaration
 
Protected Overrides Sub OnIsOpenChanged( _
   ByVal oldValue As Boolean, _
   ByVal newValue As Boolean _
) 

'Usage
 
Dim instance As DateTimePicker
Dim oldValue As Boolean
Dim newValue As Boolean
 
instance.OnIsOpenChanged(oldValue, newValue)

protected override void OnIsOpenChanged( 
   bool oldValue,
   bool newValue
)

Parameters

oldValue

newValue

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

Reference

DateTimePicker Class
DateTimePicker Members
Base Implementation in OnIsOpenChanged