gistfile1.cs

class Foo {
  readonly List<string> _names = new List<string>();
  readonly SomeType _someType = new SomeType();

  public Foo(string name) {
    _names.Add(name);
    _someType.SomeProperty = name;
  }
}

// =>

class Foo(string name) {
  readonly List<string> _names = new List<string> { name };
  readonly SomeType _someType = new SomeType { SomeProperty = name };
}