Extract Numbers From String

[Sir Loin]

Here is a method that will extract all of the numbers from a string.

        private string ExtractNumbers(string Expression)
        {
            string result = null;
            char Letter;

            for (int i = 0; i < Expression.Length; i++)
            {
                Letter = Convert.ToChar(Expression.Substring(i, 1));

                if (Char.IsNumber(Letter))
                {
                    result += Letter.ToString();
                }
            }

            // MessageBox.Show(result);
            return result;
        } 

It works well.

-Sir Loin