How to use Transaction in Entity Framework?

CREATE TABLE Personel 
(PersonelID integer PRIMARY KEY identity not null, 
Ad varchar(30), 
Soyad varchar(30),
Meslek varchar(100),
DogumTarihi datetime,
DogumYeri nvarchar(100),
PirimToplamı float);
Go

create TABLE Prim
(PrimID integer PRIMARY KEY identity not null,
PersonelID integer Foreign KEY references Personel(PersonelID),
SatisTutari int,
Prim float,
SatisTarihi Datetime);
Go

CREATE TABLE Finans 
(ID integer PRIMARY KEY identity not null, 
Tutar float);

using (TestEntities testCtx = new TestEntities())
            {
                using (TransactionScope scope = new TransactionScope())
                {
                    // do someyihng...
                    testCtx.Personel.SaveChanges();
                    // do someyihng...
                    testCtx.Prim.SaveChanges();
                    // do someyihng...
                    testCtx.Finans.SaveChanges();
                     scope .Complete();
                        success = true;

                }
            }