Cross Join

Query
public void Linq102()
{

string[] categories = new string[]{
"Beverages",
"Condiments",
"Vegetables",
"Dairy Products",
"Seafood" };

List products = GetProductList();

var q =
from c in categories
join p in products on c equals p.Category
select new { Category = c, p.ProductName };

foreach (var v in q)
{
Console.WriteLine(v.ProductName + ": " + v.Category);
}
}
Lambda Expression
public void Linq102()
{

List customers = GetCustomerList();
List suppliers = GetSupplierList();

var custSupJoin = suppliers.Join(customers, sup => sup.Country, cust => cust.Country, (sup, cust) => new {
Country = sup.Country,
SupplierName = sup.SupplierName,
CustomerName = cust.CompanyName});

foreach (var item in custSupJoin)
{
Console.WriteLine("Country = {0}, Supplier = {1}, Customer = {2}", item.Country, item.SupplierName, item.CustomerName);
}
}
Output
Chai: Beverages
Chang: Beverages
Guaraná Fantástica: Beverages
Sasquatch Ale: Beverages
Steeleye Stout: Beverages
Côte de Blaye: Beverages
Chartreuse verte: Beverages
Ipoh Coffee: Beverages
Laughing Lumberjack Lager: Beverages
Outback Lager: Beverages
Rhönbräu Klosterbier: Beverages
Lakkalikööri: Beverages
Aniseed Syrup: Condiments
Chef Anton's Cajun Seasoning: Condiments
Chef Anton's Gumbo Mix: Condiments
Grandma's Boysenberry Spread: Condiments
Northwoods Cranberry Sauce: Condiments
Genen Shouyu: Condiments
Gula Malacca: Condiments
Sirop d'érable: Condiments
Vegie-spread: Condiments
Louisiana Fiery Hot Pepper Sauce: Condiments
Louisiana Hot Spiced Okra: Condiments
Original Frankfurter grüne Soße: Condiments
Queso Cabrales: Dairy Products
Queso Manchego La Pastora: Dairy Products
Gorgonzola Telino: Dairy Products
Mascarpone Fabioli: Dairy Products
Geitost: Dairy Products
Raclette Courdavault: Dairy Products
Camembert Pierrot: Dairy Products
Gudbrandsdalsost: Dairy Products
Flotemysost: Dairy Products
Mozzarella di Giovanni: Dairy Products
Ikura: Seafood
Konbu: Seafood
Carnarvon Tigers: Seafood
Nord-Ost Matjeshering: Seafood
Inlagd Sill: Seafood
Gravad lax: Seafood
Boston Crab Meat: Seafood
Jack's New England Clam Chowder: Seafood
Rogede sild: Seafood
Spegesild: Seafood
Escargots de Bourgogne: Seafood
Röd Kaviar: Seafood