Char: IsLower/IsUpper : char « Data Type « C# / CSharp Tutorial

using System;  
  
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(); 
    } 
 
  }     
}

T is uppercase
h is lowercase
i is lowercase
s is lowercase
  is
i is lowercase
s is lowercase
  is
a is lowercase
  is
t is lowercase
e is lowercase
s is lowercase
t is lowercase
. is
  is
$ is
2 is
3 is

2.18.char
	2.18.1.	Assign value to a char type
	2.18.2.	Methods Defined by Char
	2.18.3.	Character Escape Sequences
	2.18.4.	Char: IsDigit
	2.18.5.	Char: IsLetter
	2.18.6.	Char: IsLower/IsUpper
	2.18.7.	Char: IsSymbol
	2.18.8.	Char: IsSeparator
	2.18.9.	Char: IsWhiteSpace
	2.18.10.	Char: IsPunctuation
	2.18.11.	Convert character to upper case
	2.18.12.	Use a char to control the switch.
	2.18.13.	Get characters in a string
	2.18.14.	Using the Plus Operator with the char Data Type
	2.18.15.	Char type Functionality
	2.18.16.	Determining the Character Difference between Two Characters
	2.18.17.	Displaying Each Character's ASCII Value in Descending Order
	2.18.18.	Using Unicode Encoding to Display a Smiley Face