You can use nullable types, if using 2.0, but you will have to test the
value before you bind it, as Nothing/null blows up when bound to a control.
As far as conversion, .TryParse() is a safer method of setting a DateTime,
as users sometimes do not respect dates.
If you want to force dates, you can make the control so it cannot be filled
in and use a calendar control. Or you can use an AJAX masked edit (in the
AJAX control toolkit).
--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA
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*************************************************
| Think outside the box!
|
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"James" <James@discussions.microsoft.comwrote in message
news:8192FA1E-C2C8-4845-9E3F-516F9A5ED65A@microsoft.com...
Quote:
Hello,
>
I am trying to create a Function to test TextBoxes and convert the Text to
DateTime if not empty.
>
My code is :
>
Public Shared Function GetDateTime(ByVal DateValue As String) As String
>
If Not String.IsNullOrEmpty(DateValue) Then
Return DateTime.Parse(DateValue)
Else
Return Nothing
End If
>
End Function
>
Then in a OnClick command I have:
>
CurrentMember.StartDate = GetDateTime(txtStartDate.Text)
>
It works ok when there is a date but if its empty I get an error message:
System.InvalidCastException: Conversion from string "" to type 'Date' is
not
valid.
>
If I do CurrentMember.StartDate = Nothing it works fine so no problem with
Null values in the field.
>
Does anyone have any suggestions as this has puzzled me for too long now.
>
Thanks in advance
James
