populate dropdownlist in javascript does not submit correctly

<asp:DropDownList ID="ListModel" runat="server" ClientIDMode="Static" ></asp:DropDownList>

success: function (Result) {
           Result = Result.d;
           var parsedData = JSON.parse(Result);
           $("#ListModel").empty();
           for (var i = 0; i < parsedData.length+1; i++) {
               //alert(parsedData[i].Id + parsedData[i].Name);
               //var opt = document.createElement("option");
               //opt.value = parsedData[i].Id;
               //opt.text = parsedData[i].Name;
               $("#ListModel").append($('<option><option/>').val(parsedData[i].Id).html(parsedData[i].Name));

           }