Checking if ddl selected value or not

Hi 
I need a help by checking if the ddl (which i have post it below) has value to process the first part of code and if not then move to else, what is happen that whatever if the ddl selected value or not is moving to else statement. 

<asp:DropDownList ID="SrchKeyWordDDL" runat="server"> <asp:ListItem>-- Europe and Eastern Europe --</asp:ListItem> <asp:ListItem></asp:ListItem> <asp:ListItem Value="Österreich">Austria (Österreich)</asp:ListItem> <asp:ListItem Value="Belgium">Belgium </asp:ListItem> <asp:ListItem></asp:ListItem> <asp:ListItem>-- North &amp; South of America --</asp:ListItem> <asp:ListItem></asp:ListItem> <asp:ListItem Value=&q ...