or
ddb_1.DropDownListElement.ForeColor = Color.FromArgb(21, 66, 139);
ddb_1.DropDownListElement.ListElement.ForeColor = Color.FromArgb(21, 66, 139);
ddb_1.DropDownListElement.ListElement.ElementTree.RootElement.ForeColor = Color.FromArgb(21, 66, 139);