Get Number from string

      

Get Number included in string with alphnumerical characters and special characters

 for ex.     AH23K4!%7     will returns as  2347

Here is code for same : 

       private string Number(string str)

        {

            string Num = string.Empty;

            for (int i = 0; i < str.Length; i++)

            {

                int j;

                if (int.TryParse(str[i].ToString(), out j))

                {

                    Num += j.ToString();

                }

            }

            return Num;

        }