Hi,

I presume you are referring to the Timetable view. In this case the only way to change the color of the cells in a specific column is through custom drawing. You have to set the Calendar.CustomDraw property to TimetableCell, handle the Calendar.Draw event and perform the necessary drawing in the event handler. The following code demonstrates how to custom-draw cells associated with Jan 12th, 2010:

private void calendar1_Draw(object sender, MindFusion.Scheduling.WinForms.DrawEventArgs e)
{
      if (e.Date == new DateTime(2010, 1, 12))
      {
            Rectangle bounds = e.Bounds;
            bounds.Inflate(-1, -1);
            if (e.StartTime.TotalHours < calendar1.TimetableSettings.WorkTimeStartHour ||
                  e.EndTime.TotalHours > calendar1.TimetableSettings.WorkTimeEndHour)
            {
                  e.Graphics.FillRectangle(Brushes.Red, bounds);
            }
            else
            {
                  e.Graphics.FillRectangle(Brushes.Yellow, bounds);
            }
      }
} 

The code paints non-working cells in red and working cells in yellow. You may need to perform additional checks whether a cell is selected or not in order to paint selected cells in distinguishable colors.

Regards,
Meppy