Get sum of the value from list using linq?

Question

I am trying to get the sum of the value from list of list using linq ?my data is as below code

        List> allData = new List<         


        

Answer 1

Sticking as much as possible to the LINQ query language:

var grouped = from d in allData
              group d by i[0] into g
              select new
              {
                  Name = g.Key,
                  Sum = g.Sum(i => int.Parse(i[2]))
              };