C# - Logical Operators

Following table shows all the logical operators supported by C#. Assume variable A holds Boolean value true and variable B holds Boolean value false, then:

Operator	Description	Example
&&	Called Logical AND operator. If both the operands are non zero then condition becomes true.	(A && B) is false.
||	Called Logical OR Operator. If any of the two operands is non zero then condition becomes true.	(A || B) is true.
!	Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.	!(A && B) is true.

Example

The following example demonstrates all the logical operators available in C#:
using System;
namespace OperatorsAppl
{
   class Program
   {
      static void Main(string[] args)
      {
         bool a = true;
         bool b = true;
        
         if (a && b)
         {
            Console.WriteLine("Line 1 - Condition is true");
         }
        
         if (a || b)
         {
            Console.WriteLine("Line 2 - Condition is true");
         }
         /* lets change the value of  a and b */
         a = false;
         b = true;
        
         if (a && b)
         {
            Console.WriteLine("Line 3 - Condition is true");
         }
         else
         {
            Console.WriteLine("Line 3 - Condition is not true");
         }
        
         if (!(a && b))
         {
            Console.WriteLine("Line 4 - Condition is true");
         }
         Console.ReadLine();
      }
   }
}
When the above code is compiled and executed, it produces the following result:

Line 1 - Condition is true
Line 2 - Condition is true
Line 3 - Condition is not true
Line 4 - Condition is true