Per Using Monads _The List Monad(pretty)

gistfile1.cs

var q = (
	from s in Enumerable.Range(0, 10)
	from e in Enumerable.Range(0, 10)
	from n in Enumerable.Range(0, 10)
	from d in Enumerable.Range(0, 10)
	from m in Enumerable.Range(0, 10)
	from o in Enumerable.Range(0, 10)
	from r in Enumerable.Range(0, 10)
	from y in Enumerable.Range(0, 10)

    let t1=int.Parse(string.Format("{0}{1}{2}{3}",s,e,n,d))
    let t2=int.Parse(string.Format("{0}{1}{2}{3}",m,o,r,e))
    let r0=int.Parse(string.Format("{0}{1}{2}{3}{4}",m,o,n,e,y))

	where       t1+t2==r0 && 
                    s != e && s != n && s != d && s != m && s != o && s != r && s != y &&
		    e != n && e != d && e != m && e != o && e != r && e != y &&
		    n != d && n != m && n != o && n != r && n != y &&
		    d != m && d != o && d != r && d != y &&
		    m != o && m != r && m != y &&
		    o != r && o != y &&
		    r != y

	select new {t1,t2,r0,s, e, n, d, m, o, r, y});

var result = q.ToList();