asp.net - how to set sqldatasource default value from database in c#? -


how set sqldatasource deafult value database field value. have coding like,

<asp:dropdownlist id="ddvehicle" runat="server"  appenddatabounditems="true" cssclass="drop" datasourceid="sqldatasource4" datatextfield="vehicletype" datavaluefield="vehicleid">                 <asp:listitem value="">-select-</asp:listitem>             </asp:dropdownlist>             <asp:sqldatasource id="sqldatasource4" runat="server" connectionstring="<%$ connectionstrings:taxiconnectionstring %>" selectcommand="select [vehicleid], [vehicletype] [vehiclemaster] ([vehicleid] = @vehicle or [status] = @status1)">                  <selectparameters>                     <asp:parameter defaultvalue="???" name="vehicle" type="string" />                      <asp:parameter defaultvalue="available" name="status1" type="string" />                 </selectparameters>             </asp:sqldatasource>

help me.

try this:

 sqldatasource4.selectparameters.add("@vehicle", "vehicle value");

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