Write a program in C# Sharp to count a total number of alphabets, digits and special characters in string

 using System;

 using System.Collections.Generic;

 using System.Linq; 

using System.Text;

 namespace program3

 {

 public class program3

 { 

public static void Main()

 { 

string str; int alp, digit, splch, i, l;

 alp = digit = splch = i = 0; 

Console.Write("\n\nCount total number of alphabets, digits and special characters :\n"); Console.Write(" Console.Write("Input the string : ");

 str = Console.ReadLine(); l = str.Length;

 /* Checks each character of string*/ 

while (i < l) {

if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z')) 

{

 alp++;

 } 

else if (str[i] >= '0' && str[i] <= '9') 

{ 

digit++;

 } 

else

 { splch++; 

}

 i++; 

}

 Console.WriteLine("Length of the string is : "+l);

 Console.WriteLine ("Number of Alphabets in the string is :"+alp);

 Console.WriteLine ("Number of Digits in the string is : "+digit); 

Console.WriteLine ("Number of Special characters in the string is :"+splch);

 Console.ReadKey();

 }

 }

 }