WORD,LINE,CHARACTER COUNTER IN C#

static void Main(string[] args)  {
  string str = "hello world\nmy name is sumair\n IV";
  int wordcount = 0,charcount = 0,linecount = 0;
  //calculating first line
  if (str != "")
  {
  linecount++;
  }
  for (int i = 0; i < 2; i++)
  {
  //calculating first and last word
  if ((str[0] >= 97 && str[0] <= 122) || (str[str.Length - 1] >= 97 && str[0] <= 122))
  {
  wordcount++;
  }
  }
  for (int i = 0; i < str.Length; i++)
  {
  if (str[i] == ' ')
  {
  wordcount++;
  }
  if ((str[i] >= 97 && str[i] <= 122) || (str[i] >= 65 && str[i] <= 91)) 
  {
  charcount++;
  }
  if (str[i] == '\n')
  {
  linecount++;
  }
  }
  Console.WriteLine("Total words are : "+wordcount+"\nTotal characters are : "+charcount+"\nTotal lines are : " + linecount);
  Console.ReadKey();
  }