What is the correct way of representing double in c#? -

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I am using the first thing and my new company is using it in another way. 

  Double X = 1.99; Double y = 9.02 d;   
 Which is correct and why? And if both are right, how is it used in different circumstances?   
 From 
 
 From:  
 
 By default, on the right side of the assignment operator A real numeric verb is considered as a verb double though, if you want an integer number to be considered as repeating, use suffix D or D, for example:  
 double X = 3D;   
  double x = 1.99;  and  double y = 9.02D; There is no difference between

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