Validatting datetime format in asp.net

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ASP.NET

Hi,

I have a textbox and applied ajax calender control on that set format as

dd/MMM/yyyy means date should be like 01/Dec/2010 .
and want to validate it .What should I do to validate?

My code is below:

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <cc1:CalendarExtender ID="TextBox2_CalendarExtender" runat="server"
        Enabled="True" Format="dd/MMM/yyyy" TargetControlID="TextBox2">
    </cc1:CalendarExtender>

Thanks a lot in advance.