$(function () {
          var projects = [
      {
          value: "1",
          value2: "1",
          label: "Voce 1"
      },
      {
          value: "2",
          label: "2",
label: "Voce 3"
      },
etc..
}
$("#ctl00_contentricercahome_project").autocomplete({
              minLength: 3,
              source: projects,
              
              select: function (event, ui) {
                  $("#ctl00_contentricercahome_project").val(ui.item.label);
                  $("#ctl00_contentricercahome_projectid").val(ui.item.value);
                  $("#ctl00_contentricercahome_projectcat").val(ui.item.value2);

                  return false;
              }
          })
    .autocomplete("instance")._renderItem = function (ul, item) {
        return $("<li>")
        .append("<div style='width:98%; padding:0px; padding-left:2%; padding-top:15px; padding-bottom:15px; margin:0px; border:none;'>" + item.label + "</div>")
        .appendTo(ul);
    };
      });