Web Forms :: Dropdown Menu Name Change

I cannot change the text in the drop menus. It was originally "Select a General Market", and "Select a Market". I have changed them and the changes due not take effect. I can change the labels, but not the default text inside the dropdown list. Is this something that needs to be changed elsewhere?

<asp:label id="lblSelectGenMark" runat="server">Select a market: </asp:label>
<asp:dropdownlist id="ddlGreaterMarket" runat="server">
<asp:ListItem Value="None">Select a market</asp:ListItem>
</asp:dropdownlist>
<asp:label id="lblSelectMark" runat="server">Select a region:</asp:label>
<asp:dropdownlist id="ddlMarket" runat="server">
<asp:ListItem Value="None">Select a region</asp:ListItem>
</asp:dropdownlist>
<asp:button id="Button1" runat="server" Text="Filter Scores"></asp:button></P>