Intersecting Two Lists Using LINQ

Question

I have a user called admin who has a list of companies. I want to return a list of users who have one or more companies. I am using Linq using this query, but I'm not sure why it is not working. I really do not understand what .Any () does, but if I do not enable it, the program has syntax errors. Here is my attempt:

public List<User> GetUsers(User admin)
{
    return Users.Where(user=>user.Companys.Intersect(admin.Companys)).Any()).ToList();

}

Answer 1

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public List<User> GetUsers(User admin)
{
    var adminCompanyIDs = admin.Companys.Select(c => c.ID);
    return Users.Where(user=>user.Companys.Select(c => c.ID).Intersect(adminCompanyIDs).Any()).ToList();        
}

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Answer 2

return Users.Where(user=>user.Companys.Select(c => c.ID).Intersect(admin.Companys.Select(a => a.id)).Any())
        .ToList();