ajax - Gridview TemplateField checkbox postback behavior in asp.net -

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i have gridview inside updatepanel , updatemode of updatepanel set conditional.

gridview contains asp:checkbox templatefield , rest of columns boundfields dynamically created. checbox autopostback set true , update datatable (which inside session) based on checkbox value.

here markup:

<asp:gridview id="objlist" runat="server"  cssclass="objlist" autogeneratecolumns="false" onrowdatabound="objlist_rowdatabound" autogenerateselectbutton="false" allowpaging="false">     <columns>         <asp:templatefield headertext="&nbsp">             <headertemplate>                 <asp:checkbox autopostback="true" id="chkall" runat="server" oncheckedchanged="headerchk_changed" />                 <asp:hiddenfield id="linknumindexhead" runat="server" value="-1" />             </headertemplate>         <itemtemplate>             <asp:checkbox autopostback="true" id="chkrow" runat="server" checked='<%# databinder.eval(container.dataitem, "selection")%>'                     oncheckedchanged="chkrow_oncheckchange" />                                                          </itemtemplate>                                                         </asp:templatefield>     </columns>  </asp:gridview>

in deployed version only: whenever user click 2 or more checkboxes in fast speed. postback of first checkbox fires , rest of checkboxes unchecked. how can control behavior?

when local iis running: postback of every checkbox fires.

in firebug debugging noticed postback of first checkbox takes quite time. please tell me how can avoid situation.

try this

<asp:gridview id="objlist" runat="server" cssclass="objlist" autogeneratecolumns="false"     onrowdatabound="objlist_rowdatabound" autogenerateselectbutton="false" allowpaging="false">     <columns>         <asp:templatefield headertext="&nbsp">             <headertemplate>                 <asp:updatepanel runat="server">                     <contenttemplate>                         <asp:checkbox autopostback="true" id="chkall" runat="server" oncheckedchanged="headerchk_changed" />                     </contenttemplate>                 </asp:updatepanel>                 <asp:hiddenfield id="linknumindexhead" runat="server" value="-1" />             </headertemplate>             <itemtemplate>                 <asp:updatepanel id="updatepanel5" runat="server">                     <contenttemplate>                         <asp:checkbox autopostback="true" id="chkrow" runat="server" checked='<%# databinder.eval(container.dataitem, "selection")%>'                             oncheckedchanged="chkrow_oncheckchange" />                     </contenttemplate>                 </asp:updatepanel>             </itemtemplate>         </asp:templatefield>     </columns> </asp:gridview>

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