[C#] 한글자가 숫자(1)인지 체크

//한글자가 숫자(1)인지 체크 public static int NumberCheck(string numString) { int retNumberCheck = 0; long number1 = 0;


            try{

            bool canConvert = long.TryParse(numString, out number1); 
            if (canConvert == true)

                retNumberCheck = 1;

            else

                retNumberCheck = 0;

            }

            catch

            {}
            return retNumberCheck;

}