How to search result in WebGrid using json ?

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Javascript

JSON

MVC4

ASP.NET4

I try to search content based on ajax. i successfully build search function on button click.
Now i want to show search result when typing in search textbox.

My Action Method under ProjectManager Controller

public ActionResult SearchAjax(string SearchKey )
        {
            ProjectUtility OProjectUtility = new ProjectUtility();
            IEnumerable<Project> obj = ProjectUtility.SearchByKey(Request.Url.Segments[3].ToString());
           
            return Json(obj);
        }

my search function

public IEnumerable<Project> SearchByKey(string SearchKey)
       {
           var context = new MountSinaiEntities1();

           var matches = from m in context.Project
                         where m.projectName.Contains(SearchKey)
                         select m;

           return matches;
       }

my java script code

function Search() {                
              var GetURL = location.protocol + "//" + location.host + "/ProjectUtility/SearchAjax";

                $.ajax({
                    cache: false,
                    type: "POST",
                    async: false,
                    url: GetURL,
                    dataType: "json",
                    success: function (Projects) {
                        //What to do here
                    }
                });
            }

Search TextBox

<input type="text" id="inputForm" name="txtSearch"  placeholder="Search"   önkeyup="Search()" /> 

Code to bind WebGrid

var grid = new WebGrid(Model, defaultSort: "projectName", rowsPerPage: 10, canPage: true, canSort: true, ajaxUpdateContainerId: "Grid");