score:0

<asp:linqdatasource id="linqdatasource1" runat="server"
  contexttypename="doctordatacontext" enabledelete="true" enableinsert="true" 
  enableupdate="true" entitytypename="" tablename="apointement" 
  where="@isavailable = true"> 
  <whereparameters>
     <asp:controlparameter 
         name="doctorname" 
         controlid="dropdownlist1" 
         propertyname="selectedvalue"
         type="string" />
  </whereparameters>

</asp:linqdatasource>

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