Problems updating dataset changes

I have a winform whit this load event to retrieve a User from the database:

userController = new UsuarioAD();
userDS = UserController.GetUsuarioByLogin("test"); //Return a filled datased
textBoxNombre.DataBindings.Add(new Binding("Text", userDS, "Usuario.nombre"));

in the button save event I have:

userController.UpdateUser(userDS);

userDS is a private variable (DataSet) and userController is the Bussines Object that update and retrieve the dataset.

I change the value from the textBoxNombre.text property and tried to save changes but it dosn't works.

I have tested the Bussines Object whit a console application and it works fine, but whit the WinForm application it dosn't work.

What is wrong

I have looked in the dataset userDS before the userController.UpdateUser(userDS) sentence, and it has the new data, but the rowstate flag is Unchanged.
Why
Is these the problem

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