var list = dc.Orders.
Join(dc.Order_Details,
o => o.OrderID, od => od.OrderID,
(o, od) => new
{
OrderID = o.OrderID,
OrderDate = o.OrderDate,
ShipName = o.ShipName,
Quantity = od.Quantity,
UnitPrice = od.UnitPrice,
ProductID = od.ProductID
}).Join(dc.Products,
a => a.ProductID, p => p.ProductID,
(a, p) => new
{
OrderID = a.OrderID,
OrderDate = a.OrderDate,
ShipName = a.ShipName,
Quantity = a.Quantity,
UnitPrice = a.UnitPrice,
ProductName = p.ProductName
});