add styles for calendar tooltip.

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ASP.NET

hi, I would want to apply background color and font color to the tooltip of a calendar that shows events on each date.
Please give me the complete code for the tooltip style

<asp:Calendar ID="calendar" OnDayRender="calendar_DayRender" OnSelectionChanged="calendar_SelectionChanged" runat="server"></asp:Calendar>

i have loaded the events for each date from database in calendar_DayRender().
But i am not able to add any styles to the tooltip.