c# - Trying to check checkbox but in if condition it appears not to be checked -

i want check row(s) lather update, when if condition appears if not checked.

 <asp:templatefield headertext="stock" itemstyle-width="72px" headerstyle-width="72px">             <itemtemplate>                  <asp:checkbox id="instockcbx" runat="server" />             </itemtemplate>  </asp:templatefield>         protected void usedforbutton_click(object sender, eventargs e)     {          foreach (gridviewrow row in gridview1.rows)         {             checkbox chkbox = row.findcontrol("instockcbx") checkbox;              if (chkbox.checked)             {                  int id = convert.toint32(gridview1.datakeys[row.rowindex].value.tostring());                   conn.open();                 sqlcommand comm = new sqlcommand("update worktable set instock = 0, usedorder = @usedorder id=@id", conn);                 comm.commandtype = commandtype.text;                 comm.parameters.add("@id", sqldbtype.int, 1).value = id;                 comm.parameters.add("@usedorder", sqldbtype.varchar).value = usedfortextbox.text;                 comm.executenonquery();                 conn.close();