how to check if List element contains an item with a Particular Property Value

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If you have a list and you want to know where within the list an element exists that matches a given criteria, you can use the FindIndex instance method. Such as 

int index = list.FindIndex(f => f.Bar == 17);

Where f => f.Bar == 17 is a predicate with the matching criteria.

In your case you might write 

int index = pricePublicList.FindIndex(item => item.Size == 200);
if (index >= 0) 
{
    // element exists, do what you need
}

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