p.Name); Console.WriteLine(string.Join(",", names.ToArray())); //Foo,Bar,Fizz,Buzz"> p.Name); Console.WriteLine(string.Join(",", names.ToArray())); //Foo,Bar,Fizz,Buzz"> p.Name); Console.WriteLine(string.Join(",", names.ToArray())); //Foo,Bar,Fizz,Buzz">
var persons = new[] 
{
    new {Id = 1, Name = "Foo"},
    new {Id = 2, Name = "Bar"},
    new {Id = 3, Name = "Fizz"},
    new {Id = 4, Name = "Buzz"}
};

var names = persons.Select(p => p.Name);
Console.WriteLine(string.Join(",", names.ToArray()));

//Foo,Bar,Fizz,Buzz

This type of function is usually called map in functional programming languages.