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How to assign nullable value in WinForms DateTimePicker (DateTimePickerAdv)?

Platform: WinForms |
Control: DateTimePickerAdv |
Published Date: April 28, 2016 |
Last Revised Date: November 14, 2019

Null value

In DateTimePickerAdv, Value property holds its DateTime information and not a Nullable type. In case if user would like to assign/maintain Nullable value in DateTimePickerAdv. It is possible to create a Custom control derived from DateTimePickerAdv and implement a property that helps to hold Nullable value. Please make use of below MSDN article for further reference about Nullable datatype.

 

Link: https://msdn.microsoft.com/en-us/library/system.nullable(v=vs.110).aspx

 

Following code examples demonstrates the same.

C#

private Nullable<DateTime> m_DateTimeValue = DateTime.Now;
/// <summary>
/// Gets/Sets the value of the DateTimePickerExt
/// </summary>
public Nullable<DateTime> ValueExt
{
   get 
   {
       return m_DateTimeValue; 
   }
   set 
   {
       m_DateTimeValue = value;
       if (value != null)
       {
           this.Value = m_DateTimeValue.Value;
       }
   }
}
void DateTimePickerExt_ValueChanged(object sender, EventArgs e)
{
       if(CheckNoneButtonClicked == false)
       this.ValueExt = this.Value;
       CheckNoneButtonClicked = false;
}               

 

VB

 
Private m_DateTimeValue? As DateTime = DateTime.Now
''' <summary>
''' Gets/Sets the value of the DateTimePickerExt
''' </summary>
Public Property ValueExt() As DateTime?
   Get
 Return m_DateTimeValue
   End Get
   Set(ByVal value? As DateTime)
 m_DateTimeValue = value
 If value IsNot Nothing Then
  Me.Value = m_DateTimeValue.Value
 End If
End Set
End Property```
 
Private Sub DateTimePickerExt_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
 If CheckNoneButtonClicked = False Then
      Me.ValueExt = Me.Value
 End If
      CheckNoneButtonClicked = False
 End Sub
 
 

                            

Set null to the Value in DateTimePickerAdv

Figure 1. Set Null to the Value property in DateTimePickerAdv with image.

 

Samples:

 

C#: How to assign the Value as null in DateTimePickerAdv C#?

VB: How to assign the Value as null in DateTimePickerAdv VB?

 

 

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