Edit try this , create array and pass that to your controller
var stringArray = new Array(); stringArray[0] = "item1"; stringArray[1] = "item2"; stringArray[2] = "item3"; var postData = { listkey: stringArray }; than you data will be , in you ajax call
data: postData $.ajax({ type: "POST", url: '@Url.Action("Search", "Result")', data: postData, success: function(data){ alert(data.Result); }, dataType: "json", traditional: true }); you can do like this ,