DropDownList Attributes (C#, ASP.net)

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C#

ASP.NET

drop-down

attributes

for(int i=1; i<=10; i++)
{
    li.Items.Add(new ListItem("Item" + i));
    if (i%2 == 0)
    {
       li.Items[i-1].Attributes["itemType"] = "Even";
    }
    else
    {
       li.Items[i-1].Attributes["itemType"] = "Odd"";
    }
}

I've added each list item of the li DropDownList an attribute called "itemType". But I 'm not able to get the value assigned to that attribute after I select a different item in li Dropdownlist. I think the attribute "itemType" is also getting deleted when the SelectedItem is changed.

Please help me solving this.
Thank you!