On some pages you will allow users to post even if validations fail. By doing this setting you ask asp.net to by pass validations both at the client and server
For example to bypass validations use this skip button,
<asp:Button id="Button1" runat="server"
Text="Skip" CausesValidation="False">
</asp:Button>
To disable validation at server:
change the validation control's Enabled property to false.
To disable validation at client:
Change the validation control's EnableClientScript property to false.
www.codecollege.NET