Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

Hi,
I m fetching the problem with updating record, when I debug my project then it made those changes in data, but its not saving the updated record and showing an error on db.SaveChanges();

The error is ;
Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

      [NonAction]
privateFinancilInstituteWrappergetData(int id)
        {
FinancilInstituteWrapper temp = newFinancilInstituteWrapper();
var details = from i indb.IIDBS
join a indb.ACDBS
oni.Idequalsa.Id
join b indb.BIDBSoni.Idequalsb.Id
wherei.Id==id
selectnewFinancilInstituteWrapper
                          {
                              II = i,
                              AC = a,
                              BI = b
                          };
foreach (FinancilInstituteWrapper a in details)
            {
temp.II = a.II;
                temp.BI = a.BI;
                temp.AC = a.AC;
            }

return temp;
        }

//
// GET: /FinancilInstitute/Edit/5

publicActionResult Edit(int id=0)
        {
return View(getData(id));
         }

//
// POST: /FinancilInstitute/Edit/5

        [HttpPost]
publicActionResult Edit(FinancilInstituteWrapper wrapper)
        {
// try
// {
if (ModelState.IsValid)
                {
db.Entry(wrapper.II).State = EntityState.Modified;
db.Entry(wrapper.AC).State = EntityState.Modified;
db.Entry(wrapper.BI).State = EntityState.Modified;
try
                    {
db.SaveChanges();
                    }
catch (OptimisticConcurrencyException)
                    {

                    }
returnRedirectToAction("Index");
                }
// }
//catch
//{
return View(wrapper);
//}
        }