c# - setter value is null -

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I understand that after setting a double value in the setter, the value is zero.

The code is such: 

  Public Class Product {Private Double? U_total; Public double? Total {received {return u_total; } Set {u_total = value; }}}   
 When I call:  
 for  (i = 0; i   
 For the first case, the list [1] .pice (double?) Is 1234.5, but the value of the setter will be zero. And my productions 0.  
 Please advice what is wrong   
 
 
 I guess instead  
  should be (u_total! = Null)   
  
  if (u_total == zero)

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