Csharp/CSharp Tutorial/String/String Case

Case Comparison

using System;
  class Class1
  {
    [STAThread]
    static void Main(string[] args)
    {
      char smallA = "a";
            char largeA = "A";
            Console.WriteLine( "a = {0} A = {1}", (int) smallA, (int) largeA );
            string str1 = "This Is A String.";
            string str2 = "This is a string.";
            Console.WriteLine( "Case sensitive comparison of str1 and str2 = {0}", String.rupare( str1, str2 ));
            Console.WriteLine( "Case insesitive comparison of str1 and str2 = {0}", String.rupare( str1, str2, true ));
    }
  }

Create upper and lowercase versions of a string

using System;  
  
class MainClass {   
  public static void Main() {   
    string str1 = "ABCDEabcde1234567890";   
    
    string strLow = str1.ToLower(); 
    string strUp =  str1.ToUpper(); 
    Console.WriteLine("Lowercase version of str1:\n " +  strLow); 
    Console.WriteLine("Uppercase version of str1:\n " +  strUp); 
  }
}

Lowercase version of str1:
 abcdeabcde1234567890
Uppercase version of str1:
 ABCDEABCDE1234567890