private void AddAboveAverage()
{
FormatConditionCollection conds = GetFormatCondition("A11:C12", Color.Tomato);
int idx = conds.AddCondition(FormatConditionType.AboveAverage);
FormatCondition cond = conds[idx];
cond.Style.BackgroundColor = Color.Pink;
cond.Style.Pattern = BackgroundType.Solid;
}
// This method implements an AboveAverage conditional formatting type with some custom attributes.