Count the number of capital letters, small letters, digits, spaces and special characters., C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)  
        {  
            string s = "THIS ThaT 12546 !@#$%^&";
            int number = 0;  
            int capitalLetter = 0;  
            int smallletter = 0;  
            int space = 0;  
            int SpecialSymbol = 0;  
            char[] a = s.ToCharArray();  
            for (int i = 0; i < a.Length; i++)  
            {  
                if (a[i] >= 48 && a[i] <= 58)  
                {  
                    number += 1;  
                }  
                else if (a[i] >= 65 && a[i] <= 90)  
                {  
                    capitalLetter += 1;  
                }  
                else if (a[i] >= 97 && a[i] <= 122)  
                {  
                    smallletter += 1;  
                }  
                else if (a[i] == 32)  
                {  
                    space += 1;  
                }  
                else  
                {  
                    SpecialSymbol += 1;  
                }  
            }  
            Console.Write("Capital Letter              " + capitalLetter);  
            Console.Write("\nsmall letter              " + smallletter);  
            Console.Write("\nnumber are                " + number);  
            Console.Write("\nTotal Spaces              " + space);  
            Console.Write("\nTotal Special Symbol are  " + SpecialSymbol); 
        }  
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 17 Mb, average nr of threads: 3

Count the number of capital letters, small letters, digits, spaces and...