Where parameters in EntitydataSource from dropdown control -

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using following markup, details view not populating when dropdown selected. id parameter come dropdwon selected value.it appears control parameter not functioning properly.

<asp:updatepanel id="updteditcontact" runat="server">             <contenttemplate>                 <asp:dropdownlist id="ddlcontacttoedit" runat="server" cssclass="dropdowns"                       autopostback="true" clientidmode="static"/>                 <asp:detailsview id="dveditcontacts" runat="server" height="50px" width="125px"                                  autogenerateeditbutton="true" cssclass="mgrid"/>                  <asp:entitydatasource id="edsselectedcontact" runat="server" connectionstring="name=webentities"                                        defaultcontainername="webentities" enableflattening="false"                                        entitysetname="contacts">                     <whereparameters>                        <asp:controlparameter controlid="ddlcontacttoedit" name="id"                             propertyname="selectedvalue" type="int32" />                     </whereparameters>                 </asp:entitydatasource>             </contenttemplate>             <triggers>                 <asp:asyncpostbacktrigger controlid="rbladdeditcontact" eventname="selectedindexchanged"/>                 <asp:asyncpostbacktrigger controlid="ddlcontacttoedit" eventname="selectedindexchanged"/>             </triggers>         </asp:updatepanel>

upon further research, tedious there isn't lot of actual entitydatasource control since of our ef work in code behind, there 3 issues

  1. i did not have attribute in eds markup
  2. the "type" in whereparameter needs dbtype
  3. the name attribute of whereparameter match variable in statement in eds markup

here code works:

<asp:updatepanel id="updteditcontact" runat="server">             <contenttemplate>                 <asp:dropdownlist id="ddlcontacttoedit" runat="server" cssclass="dropdowns"                       autopostback="true" clientidmode="static"/>             </contenttemplate>             <triggers>                 <asp:asyncpostbacktrigger controlid="rbladdeditcontact" eventname="selectedindexchanged"/>             </triggers>         </asp:updatepanel>         <br />         <asp:updatepanel id="updateditcontactdetail" runat="server">             <contenttemplate>                  <asp:detailsview id="dveditcontacts" runat="server" height="50px" width="300px"                                   datasourceid="edsselectedcontact" datakeynames="id" visible="false"                                   cssclass="mdetail" fieldheaderstyle-cssclass="fieldheader"                                   itemstyle-cssclass="itemvalues" commandrowstyle-cssclass="cmdrow"                                   editrowstyle-cssclass="editvalues" clientidmode="static"                                   insertrowstyle-cssclass="insertvalues" rowstyle-cssclass="rowvalues"/>                  <asp:entitydatasource id="edsselectedcontact" runat="server" connectionstring="name=webentities"                                        defaultcontainername="webentities" enableflattening="false"                                        entitysetname="contacts"  where="it.id = @id">                     <whereparameters>                        <asp:controlparameter controlid="ddlcontacttoedit" name="id" propertyname="selectedvalue" dbtype="int32"/>                     </whereparameters>                 </asp:entitydatasource>             </contenttemplate>             <triggers>                 <asp:asyncpostbacktrigger controlid="ddlcontacttoedit" eventname="selectedindexchanged"/>             </triggers>         </asp:updatepanel>

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