Question

In the following code for finding sum of Rate column in the DataTable dt

dt.Compute("Sum(Convert(Rate, 'System.Int32'))");

In this is it possible to assign group by clause like SQL Inn order to get Sum based on a value in another column of the same dt
Fo eg:

----------------------------
Rate | Group
----------------------------
100  | A
120  | B
70   | A
----------------------------

I just wanna to get Sum A=170 an Sum B=120.

Answer 1

Try LINQ,

var result = from tab in dt.AsEnumerable()
              group tab by tab["Group"]
                into groupDt
                 select new 
                  { 
                    Group = groupDt.Key,  
                    Sum=groupDt.Sum((r)=> decimal.Parse(r["Rate"].ToString()))
                  };