LINQ join Table on Variable

Question

I have this query in LINQ which I aggregate on the ID and sales:

var resultsales = (from so in _salesRepo.QueryNoTracking
                   group so by so.Id into TotaledOrders
                   select new Example
                          {
                             Id = TotaledOrders.Key.ToString(),
                             TotaledValue = TotaledOrders.Sum(s => s.TotalCost).ToString(),
                             Orders = TotaledOrders.ToString()
                          }).ToList();

Now I have this table (customerinfo) that I want to join:

ID Name Address 
---------------
1  .... .....
2  .... .....

What's the correct way to outer join with my new table stored as a variable?