System colors to dropdownlist

using System.Drawing;

string[] names = System.Enum.GetNames(typeof(System.Drawing.KnownColor));
Array values = System.Enum.GetValues(typeof(System.Drawing.KnownColor));
for (int i = 27; i <= names.Length - 8; i++)
{
ListItem item = new ListItem(names[i], values.GetValue(i).ToString());
ddlColorPicker.Items.Add(item);
ddlColorPicker.Items[i - 26].Attributes.Add("style", "background-color :" + values.GetValue(i).ToString() + "");
}