C# Program toward check character is capital, small, digit or special symbol

Program toward take one character from user furthermore determine whether the entered character is a capital letter, a small case letter, a digit or a special symbol

Program Statement:
Write a program which take one character from user furthermore determine whether the character entered is a capital letter, a small case letter, a digit or a special symbol.

Solution:

static void Main(string[] args)
        {
            char ch;
            int a;
            Console.WriteLine("Enter any Character:");
            ch = Convert.ToChar(Console.ReadLine());
            a= (int)ch;
            if (a >= 65 && a <= 90)
                Console.WriteLine("Entered Character is in Capital Letter");
            else if(a>=97 && a<=122)
                Console.WriteLine("Entered Character is in Low Letter");
            else if(a>=48 && a<=57)
                Console.WriteLine("Entered Character is a digit");
            else
                Console.WriteLine("Entered Character is a Special Symbol");
                Console.ReadLine();
        }