Dropdownlist formatting

When your dropdownlist is not populated from a table but is hard coded with the options, how do you trim the data that it is supposed to match up with ? I have

<asp:DropDownList ID="cboSponsor"
runat="server"
SelectedValue='<%# Bind("system") %>' >
<asp:ListItem Text="ADOT" ></asp:ListItem>
<asp:ListItem Text="Marana"></asp:ListItem>
<asp:ListItem Text= ...