write a function to receive a whole number and return true if the digits are in ascending order from right to left

bool IsAscending(int i)
{
 return i.ToString()
  .Reverse()
  .Select(x => int.Parse(x.ToString()))
  .Zip(new[] { 1 }.Concat(
    i.ToString()
     .Reverse()
     .Skip(1)
     .Select(x => int.Parse(x.ToString()))),
    (x, y) => x >= y)
  .All(x => x);
}