Question

How can I determine if the value in my textbox is a correct date?

ex:
this is the value of the date in my Textbox:01/32/2013

I know that it is a wrong value of date, but how can I determine that it is a wrong format?
I can avoid that by using try and catch, but I don’t want to use it, I will use it if I don’t find a solution in my problem.

<asp:TextBox ID="txtMEditStartDt" runat="server" Text='<%# Bind("StartDt", "{0:MM/dd/yyyy}") %>'
    CssClass="datePicker" SkinID="textSkin" Width="100px"></asp:TextBox>
<asp:MaskedEditExtender ID="MaskedEditStartDt" runat="server"
    TargetControlID="txtMEditStartDt" Mask="99/99/9999" MaskType="Date" 
    CultureAMPMPlaceholder="" CultureCurrencySymbolPlaceholder="" 
    CultureDateFormat="" CultureDatePlaceholder="" CultureDecimalPlaceholder="" 
    CultureThousandsPlaceholder="" CultureTimePlaceholder="" Enabled="True"/>
<asp:CalendarExtender ID="calendarEditStartDt" runat="server" TargetControlID="txtMEditStartDt" Format="MM/dd/yyyy">
</asp:CalendarExtender>

Answer 1

You can use DateTime.TryParse method. In this method used is a current culture of applicaiton. So in case of failure, it will return simply false.

DateTime dateValue = default(DateTime);
if (DateTime.TryParse(dateString, out dateValue)) 
   //SUCCESS 
else 
  //FAILURE