C# difference between list of a class -

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i got trouble getting difference between 2 list in c#.

how can difference ? have tried except did not result wanted.

for example: these products part of bill

class product {    public int id_prod;    public int quantity;    public float price; }  product prd1 = new product(){1,2,34}; product prd2 = new product(){2,5,20}; product prd3 = new product(){3,6,14}; product prd4 = new product(){4,9,8}; product prd5 = new product(){5,12,70}; product prd1b = new product(){1,60,34};   list<product> oldlst = new list<product>(){ prd1,prd2,prd3}; list<product> newlst = new list<product>(){ prd1b,prd2,prd4,prd5};

note quantity can change between old prd1 , new prd1

my problem when use var lsttodel = oldlst.except(newlst);

lsttodel filled oldlst , not make difference.

the desired result that

lsttodel = new list<product>(){prd1,prd3};

except accepts iequalitycomparer. create 1 in order determine products "equal", meaning have same properties. see more: https://msdn.microsoft.com/en-us/library/bb336390.aspx


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