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Make previous calendar dates not selectable in ASP.NET

In order to make all dates before the current date, not able to be selected, in the onDayRender event for your Calendar:

if (e.Day.Date < DateTime.Today)
{
    e.Day.IsSelectable = false;
}

To make it more obvious to the end user, also add:


e.Cell.BackColor = Drawing.Color.GhostWhite;
e.Cell.ForeColor = Drawing.Color.Gainsboro;

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