list comprehension in C#

In C#, LINQ can do list comprehension.
Below is the code that builds the list of all Pythagorean triples with elements between 1 and 20. 
```
using System.Linq;
 
static class Program {
  static void Main() {
    var ts =
      from a in Enumerable.Range(1, 20)
      from b in Enumerable.Range(1, 20)
      from c in Enumerable.Range(1, 20)
      where a * a + b * b == c * c && a <= b && b <= c
      select new { a, b, c };
 
      foreach (var t in ts)
        System.Console.WriteLine("{0}, {1}, {2}", t.a, t.b, t.c);
  }
}
```
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