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protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
const string spaceChar = " ";
DropDownList1.Items.Add(new ListItem("Parent Item 1", "Parent Item 1"));
DropDownList1.Items.Add(new ListItem("Parent Item 2", "Parent Item 2"));
DropDownList1.Items.Add(new ListItem(Server.HtmlDecode(spaceChar + "Sub1 Item 2"), "Sub1 Item 2"));
DropDownList1.Items.Add(new ListItem(Server.HtmlDecode(spaceChar + "Sub2 Item 2"), "Sub2 Item 2"));
DropDownList1.Items.Add(new ListItem(Server.HtmlDecode(spaceChar + spaceChar + "Sub1 Item 3"), "Sub1 Item 3"));
DropDownList1.Items.Add(new ListItem("Parent Item 3", "Parent Item 3"));
}
}
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