What is the maximum possible length of a .NET string?

Question

What is the longest string that can be created in .NET? The docs for the String class are silent on this question as far as I can see, so an authoritative answe

Answer 1

200 megs... at which point your app grinds to a virtual halt, has about a gig working set memory, and the o/s starts to act like you'll need to reboot.

static void Main(string[] args)
{
    string s = "hello world";
    for(;;)
    {
        s = s + s.Substring(0, s.Length/10);
        Console.WriteLine(s.Length);
    }
}

12
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15
16
17
18
...
158905664
174796230
192275853
211503438