unusual comparision result when using is operator
4419
"is" operator behaves unexpectedly with integers
39781
Why does the is operator return false when given null?
14371
Unexpected operator error
16038
C# 'is' operator performance
123797
Not equal  != operator on NULL
73203
String-bool comparsion - why?
71607
What's this =! operator?
158810
Why does >= return false when == returns true for null values?
73430
C# .Equals(), .ReferenceEquals() and == operator
118582
Using the equality operator == to compare two strings for equality in C
1469
Is there a difference between "==" and "is"?
1736
How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?
150883
Comparing String to Integer gives strange results
109567
How does operator  work when comparing two strings?
148523
How to check whether operator== exists?
35549
What is the difference between the | and || or operators?
103065
Using the not equal operator for string comparison