javascript - Jtable error while deleting -

ihis first attempt jtable. , works fine,except delete option. giving error:

"error occurred while communicating server"

<script> $(document).ready(function () {             $("#department_v").jtable({                 title: 'department entry',                 selecting: true, //enable selecting                 multiselect: true, //allow multiple selecting                 selectingcheckboxes: true, //show checkboxes on first column                  paging: true, //enables paging                 pagesize: 10, //actually not needed since default value 10.                 sorting: true, //enables sorting                 defaultsorting: 'id asc', //optional. default sorting on first load.                 actions:                 {                      listaction: '/frmadmin.aspx/departmentlist',                     deleteaction: '/frmadmin.aspx/deletedepartment',                     createaction: '/frmadmin.aspx/createnewdepartment',                     updateaction: '/frmadmin.aspx/updatedepartment',                   },                 fields:                 {                     id:                     {                         title: 'id',                         key: true,                         list: true,                         edit: false                      },                     dept_name:                     {                         title: 'departmentname',                         width: '13%'                     },                    },                    formcreated: function (event, data) {                     data.form.find('input[name="dept_name"]').addclass('validate[required]');                      data.form.validationengine();                 },                  formsubmitting: function (event, data) {                     return data.form.validationengine('validate');                 },                  formclosed: function (event, data) {                     data.form.validationengine('hide');                     data.form.validationengine('detach');                 }                 });              $('#department_v').jtable('load');         });     </script>  [webmethod(enablesession = true)]     public static object departmentlist(int jtstartindex, int jtpagesize, string jtsorting)     {         try         {             //get data database             using (var db = new hrisdbentities())             {                 var departmentresult = (from departmentlist in db.tbl_department select departmentlist).tolist();                 if (departmentresult.count != 0)                     return new { result = "ok", records = departmentresult };                 else return 0;             }         }         catch (exception ex)         {             return new { result = "error reading database", message = ex.message };         }      }       [webmethod(enablesession = true)]     public static object createnewdepartment(department record)     {         try         {             using (var db = new hrisdbentities())             {                 var newtblmember = new tbl_department                 {                     dept_name = record.dept_name                  };                 var newempadd = db.tbl_department.add(newtblmember);                 db.savechanges();                 return new { result = "ok", records = newempadd };             }         }         catch (exception ex)         {             return new { result = "error", message = ex.message };         }     }         [webmethod(enablesession = true)]     public static object deletedepartment(int record)     {         try         {              using (hrisdbentities db = new hrisdbentities())             {                 var deletedmember = db.tbl_department.first(e => e.id == record);                 db.tbl_department.remove(deletedmember);                 db.savechanges();                 return new { result = "ok" };              }         }         catch (exception ex)         {             return new { result = "error", message = ex.message };         }      }        [webmethod(enablesession = true)]     public static object updatedepartment(department record)     {         try         {             int memid =  record.id;             using (hrisdbentities db = new hrisdbentities())             {                 var updateuser = (from member in db.tbl_department                                   (member.id == memid)                                   select member).firstordefault();                 updateuser.dept_name = record.dept_name;                  db.tbl_department.attach(updateuser);                 var entry = db.entry(updateuser);                 entry.property(e => e.dept_name).ismodified = true;                  db.savechanges();                 return new { result = "ok", };             }         }         catch (exception ex)         {             return new { result = "error", message = ex.message };         }     } 

getting following error

i'm using entity framework 6.x

thanks!

in delete method need pass parameter id

updated code

[webmethod(enablesession = true)]     public static object deletedepartment(int id)     {         try         {              using (hrisdbentities db = new hrisdbentities())             {                 var deletedmember = db.tbl_department.first(e => e.id == id);                 db.tbl_department.remove(deletedmember);                 db.savechanges();                 return new { result = "ok" };              }         }         catch (exception ex)         {             return new { result = "error", message = ex.message };         }      } 

after delete option working fi9.

thanks. hope others.