Convert numbers in to words.

what you think about this code

            float tempvaluef = 12.3f;
            string tempvalue = Convert.ToString(tempvaluef);
            for (int i = 0; i < tempvalue.Length; i++)
            {

               
              wordvalue+=  stringreturn(tempvalue[i]);
            }

            Response.Write(wordvalue);
           

       
        string wordvalue;
        string temp;
        public string stringreturn(char value)
        {

            switch (value)
            {
                case '1':
                    temp = "One";
                    break;
                case '2':
                    temp = "Two";

                    break;
                case '3':
                    temp = "Three";
                    break;
                case '.':
                    temp = "Dot";
                    break;
                default:
                    temp = string.Empty;
                    break;
            }
            return temp;
        }