EF Error Attaching an entity of type 'Model' failed because

Question

I pass my model from webpage to asp.net MVC Controller.When i try to update my code i take this error.I use repository pattern.I read same errors on site but i cant figure how can adapt to my code.
Error: Attaching an entity of type 'Model' failed because another entity of the same type already has the same primary key value.
public void Update(Model model)
model.AnaHesapID = Thread.CurrentPrincipal.Identity.GetAnaHesapID();
if (model.RowNumber != Guid.Empty && model.ModelID== 0)
//when i comment this i take 0 record updated error.
var oldModel= Get(calisan.RowNumber);
model.ModelID = oldModel.ModelID;
_myDal.Update(model);
//Repository Code
public virtual int Update(TEntity TObject)
//ADD LAST MODIFIED DATE IF APPLICABLE
if (TObject is LogProperties)
(TObject as LogProperties).DegistirmeTarihi = DateTime.UtcNow;
dbContext.Set<TEntity>().Attach(TObject);
var entry = dbContext.Entry(TObject);
entry.State = EntityState.Modified;
return dbContext.SaveChanges();
//Get Context
private TContext dbContext;
private int _anaHesapID;
public EfEntityRepositoryBase()
_anaHesapID = Thread.CurrentPrincipal.Identity.GetAnaHesapID();
dbContext = GetDbContext();
#region GetContext
//Update de patlıyor link: http://stackoverflow.com/questions/23201907/asp-net-mvc-attaching-an-entity-of-type-modelname-failed-because-another-ent
private TContext GetDbContext()
return this.GetDbContext(false);
protected virtual TContext GetDbContext(bool canUseCachedContext)
if (dbContext != null)
if (canUseCachedContext)
return dbContext;
else
dbContext.Dispose();
dbContext = new TContext();
return dbContext;
#endregion
//Dispose
private bool disposed = false;
protected virtual void Dispose(bool disposing)
if (!this.disposed)
if (disposing)
dbContext.Dispose();
this.disposed = true;
public void Dispose()
Dispose(true);
GC.SuppressFinalize(this);

Answer 1

There is plenty of talk about this out on Google. Hopefully, you'll find the solution.
https://www.google.com/#q=Error:+Attaching+an+entity+of+type++failed+because+another+entity+of+the+same+type+already+has+the+same+primary+key+value.