char case

using System;  /*  j  a v a 2  s.  c o  m*/
  
class MainClass {     
  public static void Main() {     
    string str = "This is a test. $23"; 
    int i; 
 
    for(i=0; i < str.Length; i++) { 
      Console.Write(str[i] + " is"); 
      if(Char.IsLower(str[i])) 
        Console.Write(" lowercase"); 
      if(Char.IsUpper(str[i])) 
        Console.Write(" uppercase"); 
 
      Console.WriteLine(); 
    } 
 
  }     
}

using System;  //from ja  v a 2 s.co  m
  
class MainClass {     
  public static void Main() {     
    string str = "This is a test. $23"; 
 
    Console.WriteLine("Original: " + str); 
 
    // .    
    string newstr = ""; 
    for(int i=0; i < str.Length; i++) 
      newstr += Char.ToUpper(str[i]); 
  
    Console.WriteLine("Uppercased: " + newstr); 
  }     
}