c# - Dictionary throws exception even after checked for null -

I am trying to read a value of one key from a dictionary like the following:

  If (myDic ["myKey"] = null) {}   
 I can see that I am checking the blank, but still throws this KeyNotFoundException. How should I check more? Please advise!  
  
 
 
 It seems that you are confusing the behavior of  HashTable  Code> Dictionary & lt; Vaccines, televisions & gt; With . The  HashTable  class will return an  null  value when the key will not be present, while  the dictionary & lt; Vaccine, tv, gt;  will throw an exception.  
 You have to use either  included  or  TryGetValue  to avoid this problem  
  object Values; If (myDic.TryGetValue ("apple", outside values)) {...}