<ajax:CalendarExtender ID="Calendarextender1" runat="server" Format="dd/MM/yyyy" PopupPosition="BottomRight" TargetControlID="txtBxDay" Enabled="true" PopupButtonID="imgSearch"> </ajax:CalendarExtender>
if(txtBxDay.text !="") { //your update query with date } else { //your update query without date }
var
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