using System;

//Use of equality operator - 

Console.WriteLine("a" == "a");

Console.WriteLine("a" == "a ");

Console.WriteLine("a" == "A");

Console.WriteLine(1 == 2);

​

string myValue = "a";

Console.WriteLine(myValue == "a");

​

//use of ToLower(), ToUpper(), and Trim() method - 

string value1 = " a";

string value2 = "A ";

Console.WriteLine(value1.Trim().ToLower() == value2.Trim().ToLower());

​

//use of inequality operator - 

Console.WriteLine("a" != "a");

Console.WriteLine("a" != "A");

Console.WriteLine(1 != 2);

​

string myValue_1 = "a";

Console.WriteLine(myValue_1 != "a");

​

//using comparision operators - 

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Console.WriteLine(1 > 2);

Console.WriteLine(1 < 2);

Console.WriteLine(1 >= 1);

Console.WriteLine(1 <= 1);

​

//method invocation expression - 

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string pangram = "The quick brown fox jumps over the lazy dog.";

Console.WriteLine(pangram.Contains("fox"));

Console.WriteLine(pangram.Contains("cow"));

​

​

//negation/not operator - 

// These two lines of code do the same thing:

​

Console.WriteLine(pangram.Contains("fox") == false);

Console.WriteLine(!pangram.Contains("fox"));

​

Console.WriteLine(!pangram.Contains("fox"));

Console.WriteLine(!pangram.Contains("cow"));

​