DropdownList item select

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ASP.NET

My dropdownlist is

<asp:DropDownList ID="ddl1Board" runat="server" ValidationGroup="StdAdm">
                                                           <asp:ListItem Selected="True">CBSE</asp:ListItem>
                                                           <asp:ListItem>ICSE</asp:ListItem>
                                                   <asp:ListItem>BSEB</asp:ListItem>
                                                   </asp:DropDownList>

My dropdownlist value save in database. but i retrieve the database value then i not understand how to select the dropdownlist value selected.
for example:-
I save the bseb in database and retrieve the bseb in database then i want to user see to bseb is selected.