You can create a method for the dayrender event in the control. Something like that:
protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
if (e.Day.Date.DayOfWeek != DayOfWeek.Sunday) return;
e.Cell.ApplyStyle(new Style { BackColor = System.Drawing.Color.Gray });
e.Day.IsSelectable = false;
}
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