SqlQuery return -1 in EF using MVC

Question

I want to run query in EF but when I run this query in SQL SERVER MANAGEMENT THEN return "00002" but when I run in EF, this query return -1. I don't know what is happing any senior can you tell where i am wrong. I also share the screenshot of the query result where you can see the return result. error: "-1".

I am sharing the C# function where I fetch the query from the database and call the function using jquery. function working properly but query result is wrong . Why? I don't know.

when i use SQLQUERY then it will return whole query as a string like " select RIGHT('00000' + cast(ISNULL(MAX(User_Id),0)+1 as varchar(5)) + '',6)from secUsers "

 

 C#

public int Maxnumber()
{

    int result = _db.Database.ExecuteSqlCommand("select RIGHT('00000' + cast(ISNULL(MAX(User_Id),0)+1 as varchar(5)) + '',6)from secUsers");

    return result;
}

public JsonResult max_UserID()
{
    var mNo= _IAccount.Maxnumber();
    return Json(mNo, JsonRequestBehavior.AllowGet);
}

Jquery

function MaxNo() {
          $.ajax({
              type: 'GET',
              url: '@Url.Action("max_UserID")',
              dataType: 'json',
              data: {},
              success: function (mNo) {

                  $("#userid").val(mNo);
              },
              error: function (ex) {
                  var r = jQuery.parseJSON(response.responseText);
                  alert("Message: " + r.Message);
                  alert("StackTrace: " + r.StackTrace);
                  alert("ExceptionType: " + r.ExceptionType);
              }
          });
          return false;
      }