check RadDateTimePicker value against current system date time value
问题 How can I verify if the selected datetime value from the RadDateTimePicker is greater then the current system datetime value in asp.net using server side validaton . <telerik:RadDateTimePicker runat="server" ID="orderDate" > <Calendar ID="Calendar1" runat="server" EnableKeyboardNavigation="true"> </Calendar> </telerik:RadDateTimePicker> 回答1: To validate it, you need to use CompareValidator or CustomValidator. Please use following markup for datetime picker: <telerik:RadDateTimePicker runat=