Question

this seems to work when i put an item in it to filter, but i don’t want to add a filter, ie just happy to sum the column and that’s it.

i’ve tried passing in string.empty and “” but no joy:

object objColTotal;
objColTotal = _dataSetDataTable.Compute("Sum(Price)", "");
decimal tot = Convert.ToDecimal(objColTotal);

Answer 1

An empty string should work.

You can always use a filter that you are certain will include all your records.

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Quick test on a Decimal column:

var dt = new DataTable();
dt.Columns.Add("DecCol1", typeof(decimal));
dt.Columns.Add("StrCol1");
dt.Rows.Add(new object[] { 1.1, "r1"});
dt.Rows.Add(new object[] { 2.2, "r2" });
dt.Rows.Add(new object[] { 3.3, "r3" });

object sum = dt.Compute("SUM(DecCol1)", "");
Console.WriteLine(sum);

I get the correct answer: 6.6