asp.net - Adding runat server to HTML control giving error -

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i want access ahtml control on server side, while adding runat= server, giving me error as

'chka1<%# (container.recordindex) %>' not valid identifier.

here html

<input type="checkbox" runat="server" id="chka1<%# (container.recordindex)%>" name="chkac1" style="width: 17px;                                                  height: 17px;" value="<%# (container.recordindex)%>" onclick="appovechecka(this)" />

when remove runat=server works properly.

why not working runat=server. suggestion

update

the id's changing accordingly of checkboxes. here code have written

var checkboxid;     var status;     var arra = [];     var arrb = [];     var rowindex     function appovechecka(chk) {         status = true;         checkboxid = $(chk).attr("id");         funclientselectafter(status, checkboxid);     }     function appovecheckb(chk) {         status = true;         checkboxid = $(chk).attr("id");         funclientselectafter1(status, checkboxid);     }      function funclientselectafter(status, checkboxid) {         if (status && checkboxid != null) {             var len = checkboxid.length;              if (len >= 7) {                 rowindex = checkboxid.substring(checkboxid.length - 2, checkboxid.length);             }             else {                 rowindex = checkboxid.substring(checkboxid.length - 1, checkboxid.length);              }             (var col = 1; col <= 4; col++) {                 if (("chka" + col + rowindex) == checkboxid) {                     if (document.getelementbyid("chka" + col + rowindex).checked == true) {                         $("#chka" + col + rowindex).attr("checked", true);                         arra[rowindex] = col;                         continue;                     }                     else                         arra[rowindex] = 0                 }                 $("#chka" + col + rowindex).attr("checked", false);             }             document.getelementbyid("hidratea").value = arra.join();             // alert(document.getelementbyid("hidratea").value);         }     }

the id going typed identifier in c#. therefore id can't change , can't contain invalid characters.

the simple solution remove id attribute.

<input type="checkbox" runat="server" id="chka1" name="chkac1" style="width: 17px; height: 17px;" value="<%# (container.recordindex)%>" onclick="appovechecka(this)" />

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