Question

What’s the best way to create multi-line string in C#?

I know the following methods:

Using StringBuilder

var result = new StringBuilder().AppendLine("one").AppenLine("two").ToString()

looks too verbose.

Using @

      var result = @"one
two"

looks ugly and badly formatted.

Do you know better ways?

Answer 1

What about this:

var result = string.Join(Environment.NewLine, new string[]{ 
    "one",
    "two" 
});

It’s a bit painful and possibly an overkill, but it gives the possibility to preserve the lines separation in your code.
To improve things a little, you could use an helper method:

static string MultiLine(params string[] args) {
    return string.Join(Environment.NewLine, args);
}

static void Main(string[] args) {
    var result = MultiLine( 
        "one",
        "two" 
    );
}