jquery - error Status: 'Internal Server Error'. Error code: 500 in MVC4 JQgrid Edit and Delete -

Hi, I started working on JQGR, and it works well for adding, searching and for everyone, but when I want to get the record as my post says to me error, but if I do not enter it to remove and edit the controller action myself, I checked it with a brake point there. My code looks like {{/ p>

  & lt; Table id = "jQGridDemo" & gt; & Lt; / Table & gt; & Lt; Div id = "jQGridDemoPager" & gt; & Lt; / Div & gt; & Lt; Script type = "text / javascript" & gt; JQuery ("# ​​jQGridDemo"). JquGrid ([url: 'RTGser / GetUserDetails', datatype: "Jason", colNames: ['Id', 'name', 'designation', 'city'], colomodel: [{name: 'name', 'name' Align: 'name', width: 40, align: 'id', index: 'id', width: 40, align: 'center', sorted: true, editable: false}, {name: 'name {Name: 'Designation', Index: 'Designation', Width: 400, Line: 'Center', 'Center', Sorted: Correct, Editable: True, Editing: 'Text', Editorial: {Required: True}}, , Sorted: true, editable: true, edittype: 'text', editrule S: {Required: true}}, {name: 'city', index: 'city', width: 150, align: 'center', sorted: right, editable: [5, 10, 20, 30] Pager: 'id', viewer: true, sor Torder: '# jQGridDemoPager', sort name: true, edittype: 'text', editrules: {required: true}}], MTIP: 'POST', to load: 'Desc', caption: "user list"}); JQuery ("# ​​jQGridDemo"). JqGrid ('navgrid', '#jQGridDemoPager', {edit: true, add: true, del: true, search: true}, {url: "/ RTGUser / EditUser", closeAfterEdit: true, (Showid) $ ("# Id", formid) .hide ();}}, {url: "/ RTGUser / addNewUser", closeAfterAdd: true, beforeShowForm: function {formid} {$ ("# id", formid) .hide ( );}}, {Url: "/ RTGUser / DeleteUser"}, {}); $ ("#search"). Filter grid ("# grid", {grid model: wrong, filter model: [[label: 'search', name: 'search', stip: 'text'}]}); & Lt; / Script & gt; & Lt; / Body & gt;  

}

and looks like my controller {

  Public user editing user (int user id, string name, string Desig, string city) {try {var query = u to db.Users where u.Id.Equals (userId) select; Var user = query.First (); User.Name = Name; User.Designation = desig; User.City = City; Db.SaveChanges (); Return Jason (true); } Hold (exception) {// some error logging content, handling exceptions etc. Back Jason (wrong); }} Public Action Result Delete User (from user ID) (DB user in URL from {var query =} Select UID.quality (userID) u; // var user = query.First (); var usr = db Finders (convert.tooinnt32 (userId); db.Users.Remove (usr); db.SaveChanges (); return Jason (true);} hold (exception e) {// some error logging content, handle exception (E); Return Jason (false); please}} 
 P> Use Firefox / Firebug or IE8 Developer Tools so that you can Micro actual response getting from the server. It falls on what line? Once you've searched, you will probably find your error.