<asp:Calendar ID="Calendar1" runat="server"></asp:Calendar>
// How to disable selected dates on Calendar1?
<asp:Calendar ID="Calendar1" runat="server"></asp:Calendar>
// How to disable selected dates on Calendar1?
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This is your working code? I cannot see any date selected, you have to use the SelectedDates property of the control.
Here is one good reference from W3: http://www.w3schools.com/aspnet/control_calendar.asp