// Create Two classes. class State { public int StateID { get; set; } public string Name { get; set; } } class City { public int StateID { get; set; } public string name { get; set; } } // Now consume them as below... var states = new State[] { new State{StateID = 5, Name = "Andhra"}, new State{StateID = 6, Name = "Maharashtra"}, new State{StateID = 7, Name = "Karnataka"}, new State{StateID = 8, Name = "Gujarat"} }; // Example orders. var cities = new City[] { new City{StateID = 8, name = "surat"}, new City{StateID = 5, name = "hyderabad"}, new City{StateID = 7, name = "bangalore"}, new City{StateID = 6, name = "Mumbai"} }; // Join on the StateID properties. var query = from c in states join o in cities on c.StateID equals o.StateID select( new { aa= c.Name,bb= o.name }); // Display joined groups. foreach (var group in query) { Console.WriteLine("{0} has {1}", group.aa, group.bb); }