close
<asp:comparevalidator runat="server"
errormessage="The date must be greater than today"
controltovalidate="txtDate1" type="date"
valuetocompare="<%# DateTime.Today.ToShortDateString() %>" />
Then in your Page_Load method, call Page.DataBind().
Operator="GreaterThan"
http://stackoverflow.com/questions/2264215/using-the-comparevalidator-control-to-compare-user-input-date-with-todays-date
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