How to update a specific user record in db by using entityn framework

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C#

ASP.NET

entity-framework

I want to update a specific record in database by using entity framework

my code is following

public int UpdateDataToDb(BusinessObjects objects, PersonalData newPersonal, EducationalData newEducational, ContactData newContact)
        {
            int status = 5;
            try
            {
                /// Updating Status
                UserCredential Credentials = newPersonEntity.UserCredentials
                                               .First(cd => cd.UserName == objects.UserName);
                Credentials.Status = objects.Status;

                /// Updating Data
                switch (objects.FormId)
                {
                    case 1:
                        PersonalData personal = newPersonEntity.PersonalDatas.First(dt=>dt.UserName==objects.UserName && dt.FormName==objects.FormName);
                      /// Suggest Code Here      
                    default:
                        break;
                }

                /// Saving Changes to Db
                return newPersonEntity.SaveChanges();

            }
            catch (Exception ex)
            {
                CatchError(ex);
                return 3;
            }



        }

i want to update it by object tell me the best way

thanks in advance