C#判斷數字，字母，漢字

using System;
namespace Example_6
{
    class DigitLetterPunctuation
    {
         static void Main(string[]args)
         {
              int countLetters=0;
              int countDigits=0;
              int countPunctuations=0;
             string input;
             Console.WriteLine("請輸入一個字串");
             input=Console.ReadLine();
             foreach(char chr in input)
             {
                   if(char.IsLetter(chr))
                        countLetters++;
                  if(char.IsDigit(chr))
                        countDigits++;
                 if(char.IsPunctuation(chr))
                        countPunctuations++;
             }
            Console.WriteLine("字母的個數為：{0}",countLetters);
            Console.WriteLine("數位個數為：{0}",countDigits);
            Console.WriteLine("字母的個數為：{0}",countPunctuations);

       }

    }
} 

        void check()
        {
            /*
               string   str   =   "和";//你要判斷的字元  
               byte[]   tmp   =   System.Text.UnicodeEncoding.Default.GetBytes(str);  
               if(tmp.Length   >1)  
               {  
               //字元為漢字  
               } 
             */
            string s = numericUpDown1.Value.ToString();
            int n = 0;
            foreach (char c in s)
            {
                if (c >= 0x4e00 && c <= 0x9fa5)
                    n++;
            }
            if (n > 0)
            {
                MessageBox.Show("輸入為數字");
            }
        }