c# - Recover id in display list using combobox -

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i need recover id of element selected in combobox in dev express , code of combobox:

 @html.devexpress().combobox( settings => {     settings.name = "combobox4";     settings.width = 180;     settings.selectedindex = 0;     settings.properties.dropdownwidth = 550;     settings.properties.dropdownstyle = dropdownstyle.dropdownlist;     settings.callbackroutevalues = new { controller = "editors", action = "multicolumncomboboxpartial" };     settings.properties.callbackpagesize = 30;     settings.properties.incrementalfilteringmode = incrementalfilteringmode.startswith;     settings.properties.textformatstring = "{1}";     settings.properties.valuefield = "id";     settings.properties.valuetype = typeof(string);    settings.properties.columns.add("id", "id", 130).setcolvisible(false);   // settings.properties.columns.add("id", "id", 130).setcolvisibleindex(1);      settings.properties.columns.add("nom", "nom", 130);     settings.properties.columns.add("prenom", "prenom", unit.percentage(100));     settings.properties.columns.add("datenaissance", "datenaissance", 60);     settings.properties.columns.add("codeclient", "codeclient", 100);    }      ).bindlist(client).gethtml()

and method ajax how put value of custom ajax: 

function addprojet() {         debugger;         var nom = $("#nom2_i").val();         var description = $("#description_i").val();         var client = $("#combobox4_i").val();         var chef = $("#chefid_i").val();         var complexite = $("#combobox1_i").val();         var taille = $("#combobox2_i").val();          var datedebut = $("#datedebut_i").val();         $.ajax({             url: "/projet/ajouterprojet?nom=" + nom + "&description=" + description + "&client=" + client + "&chef=" + chef + "&complexite=" + complexite + "&taille=" + taille + "&datedebut=" + datedebut,   //          /controlleur/action             type: "post",             datatype: 'text',             //data : {nom: nom},             success: function (responsetext) {                 debugger;                 if (responsetext == "true") {                     location.replace("/client/listeclients");                 }                 else {                     alert("error");                 }             }         });     }     </script>

how can resolve issue because need recover id of client without displaying in list in combobox can semeone me fix .


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