dropdown menu name change

I can not 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>&nbsp;
<asp:dropdownlist id="ddlGreaterMarket" runat="server">
<asp:ListItem Value="None">Select a market</asp:ListItem>
</asp:dropdownlist>&nbsp;&nbsp; 
<asp:label id="lblSelectMark" runat="server">Select a region:</asp:label>&nbsp;
<asp:dropdownlist id="ddlMarket" runat="server">
<asp:ListItem Value="None">Select a region</asp:ListI ...