how to calculate(sum up) an a row value of an datatable

Question

i have an datatable like this. i am getting this data from an excel sheet and converted to datatable

id  workedhours  tfshours
1     3          2
2     5          5
3     .7         3
4      2         3.2
5     4.3       6.8 

now i need the sum of the column workedhours and tfshours

how can i achive that is .there any builtin function to get the sum of teh column

i need the result like this in a new datatable

 workedhours   tfshours
15                20

any help would be greatly appreicated. thank you

Answer 1

Create a new Datatable and use the datatable.compute methods.

        DataTable sumDataTable = new DataTable();
        sumDataTable.Columns.Add("total", typeof(string));
        sumDataTable.Columns.Add("workedhours", typeof(int));
        sumDataTable.Columns.Add("tfshours", typeof(int));

        DataRow row = sumDataTable.NewRow();
        row["total"] = "Total";
        row["workedhours"] = oldDataTable.Compute("Sum(workedhours)", "workedhours > 0");
        row["tfshours"] = oldDataTable.Compute("Sum(tfshours)", "tfshours > 0");
        sumDataTable.Rows.Add(row);

The second parameter, filter, determines which rows are used in the expression, but you could just put "" to select all rows.

Answer 2

There is buit-in method in DataTable object: DataTable.Compute

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