Get the differences between 2 lists

Question

I have two lists (ListA and ListB), the type of these lists is the same PersonInfo, the Loginfield is a unique key.

Answer 1

EDIT

Try this soltuion for detail difference : Compare two objects and find the differences

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How to: Find the Set Difference Between Two Lists (LINQ)

Enumerable.Except Method (IEnumerable, IEnumerable) -Produces the set difference of two sequences by using the default equality comparer to compare values.

       double[] numbers1 = { 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 };
        double[] numbers2 = { 2.2 };

        IEnumerable onlyInFirstSet = numbers1.Except(numbers2);

or

//newList will include all the common data between the 2 lists
List newList = list1.Intersect(list2).ToList();


//differences will be the data not found 
List differences = list1.RemoveAll(a => newList.Contains(a));

or

outer join to get difference

var compare1to2 = from a in 
           from b in driveList2.Where(b => b.property == a.property).DefaultIfEmpty()
                              select a;