asp.net - DropdownList Selected Value as Parameter for another DropdownList -


i'm having bit of difficulty trying accomplish goal here,

i have 2 dropdowns, i'd able change values available within dropdown_objective according selected value within dropdown_parent. these dropdowns contained within templatefield, 

<asp:gridview id="gridview1" runat="server" allowpaging="true" allowsorting="true" pagesize="20" autogeneratecolumns="false" datakeynames="visitobjectivekey"      onsorting="gridview1_sorting" onpageindexchanging="gridview1_pageindexchanging" width="100%">     <columns>         <asp:templatefield headertext="parentid" sortexpression="parentid">             <edititemtemplate>                 <asp:dropdownlist id="updparentid" runat="server" width="100%" skinid="-1" cssclass="text ui-widget-content ui-corner-all" appenddatabounditems="true" datasource="sqldatasource1" datatextfield="parentkeydesc" datavaluefield="parentkey" >                 </asp:dropdownlist>             </edititemtemplate>             <itemtemplate>                 <asp:label id="itemparentid" runat="server" text='<%# eval("parentid") %>' ></asp:label>             </itemtemplate>             <footertemplate>                 <asp:dropdownlist id="insparentid" runat="server" width="100%" skinid="-1" cssclass="text ui-widget-content ui-corner-all" appenddatabounditems="true" datasource="sqldatasource1" datatextfield="parentkeydesc" datavaluefield="parentkey" >                 </asp:dropdownlist>             </footertemplate>         </asp:templatefield>          <asp:templatefield headertext="objective" sortexpression="objective">             <edititemtemplate>                 <asp:dropdownlist id="updobjective" runat="server" width="100%" skinid="-1" cssclass="text ui-widget-content ui-corner-all" appenddatabounditems="true" datasource="sqldatasource2" datatextfield="objectivekeydesc" datavaluefield="objectivekey" >                 </asp:dropdownlist>             </edititemtemplate>             <itemtemplate>                 <asp:label id="itemobjective" runat="server" text='<%# eval("objective") %>' ></asp:label>             </itemtemplate>             <footertemplate>                 <asp:dropdownlist id="insobjective" runat="server" width="100%" skinid="-1" cssclass="text ui-widget-content ui-corner-all" appenddatabounditems="true" datasource="sqldatasource2" datatextfield="objectivekeydesc" datavaluefield="objectivekey" >                 </asp:dropdownlist>             </footertemplate>         </asp:templatefield>     </columns>

this sqldatesource i'm trying use dropdown_objective,

<asp:sqldatasource  id="sqldatasource2"                      runat="server"                      connectionstring="<%$ connectionstrings:connectionstring %>"                      selectcommand="select  objectivekey, objectivekeydesc t_table objectivekey = @parentid">                     <selectparameters>                         <asp:controlparameter controlid="updparentid"                                                name="parentid"                                                propertyname="selectedvalue"                                               type="string" />                     </selectparameters> </asp:sqldatasource>

any ideas i'm doing wrong or how can achieve goal?

where clause should specified in query inside of selectcommand attribute in asp:sqldatasource: selectcommand="select objectivekey, objectivekeydesc t_table objectivekey = @parentid">

try instead: selectcommand="select objectivekey, objectivekeydesc t_table objectivekey = @parentid


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