Custom Datetime Picker

I have a form with several DateTime fields many will remain blank and are nullable fields on the database. Of course the problem is the datetime picker will not allow null values. My solution is to make the field a textbox and format the data in the advanced option of the binding. This works but now I would like to add a button that will popup a datetime picker and allow the user to select the date from a calendar. I know I have seen such a thing in the past but can't seem to find the code now. Can anyone help.


Attachment 170615

It is possible to show an empty DateTimePicker like this

Code:

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    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        If IsDate(dt) Then ' dt is a date string from the database
            DateTimePicker1.Format = DateTimePickerFormat.Long
            DateTimePicker1.Value = dt
        Else
            DateTimePicker1.CustomFormat = " "  'An empty SPACE
            DateTimePicker1.Format = DateTimePickerFormat.Custom
        End If

    End Sub

    Private Sub DateTimePicker1_ValueChanged(sender As Object, e As EventArgs) Handles DateTimePicker1.ValueChanged
        If DateTimePicker1.Format = DateTimePickerFormat.Custom Then ' restore default format
            DateTimePicker1.Format = DateTimePickerFormat.Long
        End If
    End Sub

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