I believe you are talking about sets. you have 2 options.
1. use a set instead of a list/bag. by definitions sets will contain
uniquely identified objects
if(set.Add(item))
{
//item was added
}
else
{
//item was not added
}
2. check to make sure it does not already exist. which is basically what
set is doing
if(list.Contains(item)) return;
list.Add(item);
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