Using Linq to GroupBy and Sum datatable

Question

Hi, I have a Datatable like this:

Id             Amount 1        Amount 2        Amount 3  
1              2               2               2  
12         


        

Answer 1

You are making your calls out of order. The code below wont put the data into a table, but it will give you data you could put into a table easily.

dt.AsEnumberable()
    .GroupBy(g => g["ID])
    .Select(g => new {
        Id = g.Key, 
        Amount1 = g.Sum(s => s.Amount1), 
        Amount2 = g.Sum(s => s.Amount2), 
        Amount3 = g.Sum(s => s.Amount3)});