How to find how many Uppercase, Lowercase and Numbers in the string

using System; class Count { public static void Main() { String str = "ABCdefg123@#"; int upper = 0, lower = 0; int number = 0, special = 0; for(int i = 0; i < str.Length; i ) { char ch = str[i]; if (ch >= 'A' && ch <= 'Z') upper ; else if (ch >= 'a' && ch <= 'z') lower ; else if (ch >= '0' && ch <= '9') number ; else special ; } Console.WriteLine("Upper case letters : " upper); Console.WriteLine("Lower case letters : " lower); Console.WriteLine("Number : " number); Console.Write("Special characters : " special); } }