DataGridView Not Bind IEnumerable<TResult> but does List<TResult>

I've written this code:

public List<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
    using (RepositoryDataContext = new DataClasses1DataContext())
    {
        return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).ToList<TResult>();
    }
}

and call it from the Form this way:

dgvFindFirst.DataSource = clsr.SelectAll<SelectAllRegion>(MY SELECT LAMBDA EXP);

but when write a method like this :

public IEnumerable<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
    using (RepositoryDataContext = new DataClasses1DataContext())
    {
        return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).AsEnumerable<TResult>();
    }
}

DataGridView Not Bound any Nothing returns. Wha开发者_高级运维t is the problem?

The DataGridView DataSource property can be any object that implements one of these interfaces: IList, IListSource, IBindingList or IBindingListView, which List<T> does, but IEnumberable<T> doesn't. Reference: http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.datasource.aspx