The code you provided does not compile. Is it intended or you have missed something?

In addition, can you provide some more information about the context of this snippet so I can give more helpful reply. I do not entirely understand if you want the collection to be static(shared across all the instances of the class) or not.

What I understand currently is that:
1. You want a wrapper class around the collection.
2. Fetch the collection with GetSampleData function.

public class SampleData
{
private ObservableCollection<Product> teams = new ObservableCollection<Product>();

// Everything related to collection manipulation
//
public void Add(Product add)
{
teams.Add(add);
}

public void Remove(Product rem)
{
teams.Remove(rem);
}

public int this[Product i]
{
get { return teams; }
set { teams = value; }
}

public IEnumerator<Product> GetEnumerator()
{
return teams.GetEnumerator();
}

// Class methods
//
public ObservableCollection<Product> GetSampleData()
{
return teams;
}
}

Using the class above is pretty much pointless since only the GetSampleData is a special and everything else is already implemented in the ObservableCollection class so instead of it, I would instantiate the ObservableCollection<Product> directly instead, unless you will add some confirmation logic in the functions above.