asp.net - pass ID value to OnCheckedChange event in code behind -

i have gridview has 1 checkbox each row of data.

when checkbox checked or unchecked, need update bit flag in database.

i'm trying use oncheckedchanged event.

it fire, getting null error has id.

my problem is, i'm not quite sure how needed id oncheckedchanged event code.

i need id update appropriate row in database.

i found few relavent questions on stackoverflow none of supplied answers helped me out.

thanks!

my gridview code:

<asp:gridview id="gvlisting" runat="server" autogeneratecolumns="false">     <columns>         <asp:templatefield headertext="item ready">         <itemtemplate>             <asp:checkbox id="isready" runat="server" autopostback="true" oncheckedchanged="isready_checkedchanged" checked='<%#isready(cint(eval("isready")))%>'/>         </itemtemplate>         </asp:templatefield>         <asp:templatefield headertext="item name">             <itemtemplate>                 <asp:label id="itemname" runat="server" text='<%#cleanstring(eval("itemname").tostring())%>'></asp:label>             </itemtemplate>         </asp:templatefield>     </columns> </asp:gridview> 

code behind:

public sub isready_checkedchanged(byval sender object, byval e eventargs)      dim box checkbox = directcast(sender, checkbox)     if box.checked = true         'custom code executing sql update statement         db.executenonquery(addisreadyflag, new sqlparameter("@itemid", me.id))     else         db.executenonquery(removeisreadyflag, new sqlparameter("@itemid", me.id))     end if  end sub 

me.id id of page since me current page-instance.

you add template-field id:

<asp:templatefield headertext="item-id" visible="false">     <itemtemplate>         <asp:label id="itemid" runat="server" text='<%# eval("itemid") %>'></asp:label>     </itemtemplate> </asp:templatefield> 

now can use namingcontainer row , findcontrol label:

public sub isready_checkedchanged(byval sender object, byval e eventargs)      dim box checkbox = directcast(sender, checkbox)     dim row = directcast(box.namingcontainer, gridviewrow)     dim itemid = directcast(row.findcontrol("itemid"), label).text     if box.checked = true         'custom code executing sql update statement         db.executenonquery(addisreadyflag, new sqlparameter("@itemid", itemid))     else         db.executenonquery(removeisreadyflag, new sqlparameter("@itemid", itemid))     end if  end sub