Summarize list by property

Question

I have a list of objects like this:

List list = new List();
list.Add(new ClassName()
{
    Name = 1,
    Amount = 5
});
list.Ad         


        

Answer 1

 var lst = list.GroupBy(g = > g.Name).Select(t = > new
 ClassName()
 {
     Amount = t.Sum(s=>s.Amount), Name = t.Key
 }).ToList();