public RefValue()
{
var x = 1;
var y = "2";
var z = DemoData.GetDemoObj();
TuWas(x, y, z);
#region ref
//TuWas(ref x, ref y, z);
#endregion
Console.WriteLine("x: " + x);
Console.WriteLine("y: " + y);
Console.WriteLine("z: " + z.MyString);
#region Compare strings
// https://www.codeproject.com/Articles/406046/Why-strings-are-immutable-and-what-are-the-implica
#endregion
}