Splitting number and string using linq

This is how you can do:

            string str = "ahde7394";
            var array = str.ToCharArray();
            var letters = array.Where(w => Char.IsLetter(w)).ToList().Select(s => s.ToString()).ToArray();
            var numbers = array.Where(w => Char.IsNumber(w)).ToList().Select(s => (int)Char.GetNumericValue(s)).ToArray();
            //new strings:
            string newLetter = string.Join("", letters.ToArray());
            int newNumbers = numbers.Aggregate((i, j) => int.Parse(i.ToString() + j.ToString())); //to get real number

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Mitja