Question

Whats the difference between these three ways of creating a new List<string> in C#?

A = new List<string>();
B = new List<string> { };
C = new List<string>() { };

Answer 1

Those are equivalent, all three create an empty List<string>.

1. is a simple, parameterless constructor
2. uses the collection initialization syntax, where you are allowed to omit the braces of the constructor if the class provides a parameterless constructor
3. the same as 2., just providing the optional constructor braces.

The collection initialization syntax allows you to provide data while constructing the object,

List<string> list = new List<string> { "one", "two", "three" };

gets expanded to

List<string> list = new List<string>();
list.Add("one");
list.Add("two");
list.Add("three");

by the compiler.