asp.net mvc - Adding two lists together with duplicates C# MVC -

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i have 3 lists of product entity keys want put one big list. want duplicates present want determine product mentioned in final list.

i trying use .union removes duplicates final list.

//union selector results iqueryable<productmodel> unionproducts = categoryproducts.union(attoptproducts);  if (manufacturerproducts != null)      unionproducts = unionproducts.union(manufacturerproducts);  if (brandproducts != null)      unionproducts = unionproducts.union(brandproducts);

any appreciated.

use concat instead of union keep duplicates:

        iqueryable<productmodel> unionproducts = categoryproducts.concat(attoptproducts);         if (manufacturerproducts != null)             unionproducts = unionproducts.concat(manufacturerproducts);         if (brandproducts != null)              unionproducts = unionproducts.concat(brandproducts);

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