// i is compiled as an int
var i = 5;

// s is compiled as a string
var s = "Hello";

// a is compiled as int[]
var a = new[] { 0, 1, 2 };

// expr is compiled as IEnumerable<Customer>
// or perhaps IQueryable<Customer>
var expr =
    from c in customers
    where c.City == "London"
    select c;

// anon is compiled as an anonymous type
var anon = new { Name = "Terry", Age = 34 };

// list is compiled as List<int>                             
var list = new List<int>();

class ImplicitlyTypedArraySample
{
    static void Main()
    {
        var a = new[] { 1, 10, 100, 1000 }; // int[]
        var b = new[] { "hello", null, "world" }; // string[]

        // single-dimension jagged array
        var c = new[]   
        {  
            new[]{1,2,3,4},
            new[]{5,6,7,8}
        };

        // jagged array of strings
        var d = new[]   
        {
            new[]{"Luca", "Mads", "Luke", "Dinesh"},
            new[]{"Karen", "Suma", "Frances"}
        };
    }
}

var contacts = new[] 
{
    new {
            Name = " Eugene Zabokritski",
            PhoneNumbers = new[] { "206-555-0108", "425-555-0001" }
        },
    new {
            Name = " Hanying Feng",
            PhoneNumbers = new[] { "650-555-0199" }
        }
};