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get all items common

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :ASP.Net

List<user> Collection1 =new List<user>

List<user> Collection2 =new List<user>

I have to get all items common to both the collection using linq

.Even though the object user has a lot of properties

I just want to compare FirstName and LastName

how can i get the items not in Collection1 but not in  Collection2 using the same comparison rule

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