Get Length of Dropdownlist in ASP.NET using JQuery

ASP.NET dropdown
  1. <asp:DropDownList ID="DropDownList1" runat="server" >  
  2.    <asp:ListItem Value="1">Germany</asp:ListItem>  
  3.    <asp:ListItem Value="2">France</asp:ListItem>  
  4.    <asp:ListItem Value="3">Brazil</asp:ListItem>  
  5. </asp:DropDownList>  
JQuery
  1. var items = $("#DropDownList1 option").length;