#161 What if an instance method decides to become static by making its `this` equal to null? You better check that! C# +13 
class ExampleClass {
    public void DoSomething()
    {
       if (this != null) {
           //omitted
       }
    }
    
    public void DoSomething2()
    {
       if (this != null) {
           //omitted
       }
    }
    
}

Explanation: This can't be null in C# virtual instance methods - I was so confused by the widespread use of this check that I asked this question at SO: https://stackoverflow.com/questions/31747718/can-this-be-null-in-c-sharp-virtual-methods-what-happens-with-the-rest-of-ins

By Michail Michailidis, 2017-12-13 14:54:58