c# - checkbox value not inserting in database -

whenever checkbox in dialog box checked , after clicking button doesn't save data database save 'n' checkbox checked saves 'n' how solve problem. want save 'y' database if checkbox checked.

html:-this html section in checkbox declared

<form id="form1" runat="server">     <div id="dialog">     <label>first</label>       <asp:checkbox id="checkbox1" runat="server" />       <label>second</label>       <asp:checkbox id="checkbox2" runat="server" />       <label>third</label>       <asp:checkbox id="checkbox3" runat="server" />      </div>         <asp:button id="button1" runat="server" text="button" onclick="button2_click" />      </form>  jquery:-here jquery script.dialogbox checkbox      <script type="text/javascript">                 $(document).ready(function () {                     $("#dialog").dialog({                         buttons: {                             ok: function () {                                 $("[id*=button1]").click();                             },                             close: function () {                                 $(this).dialog('close');                             }                         }                     });                     });             </script>     code behind:- c# code behind file inserting data in database using ado , sql      protected void button2_click(object sender, eventargs e)             {                  clientscript.registerstartupscript(page.gettype(), "key", "alert('button clicked')", true);                   string first = checkbox1.checked ? "y" : "n";                 string second = checkbox2.checked ? "y" : "n";                 string third = checkbox3.checked ? "y" : "n";                  string cs = configurationmanager.connectionstrings["dum01connectionstring"].connectionstring;                 using (sqlconnection scon = new sqlconnection(cs))                 {                     using (sqlcommand cmd = new sqlcommand("insert checkbox (first,second,third) values(@first,@second,@third)"))                     {                         cmd.connection = scon;                         cmd.parameters.addwithvalue("@first", first);                         cmd.parameters.addwithvalue("@second", second);                         cmd.parameters.addwithvalue("@third", third);                         scon.open();                         cmd.executenonquery();                         scon.close();                     }                 }             }      saves 'n' database if checkbox checked saves 'n' database how solve 

i debugged code on side, didn't find issue in code. getting expected value y whenever checked checkbox.

it seems issue might coming somewhere else.

see attached screenshot of debugging.

in above screenshot, checked first checkbox , got it's value y in debugging part.

suggestion:

try taking code new fresh page , implement part of functionality. idea, issue coming somewhere else.

hope helps, let me know if face other issues related this.

update

since using dialog box, have @ below link reference. might you

dialogbox