ADO.NET in a Nutshell

Performing Aggregate Calculations

The Compute( ) method computes the result of an aggregate query on the rows in the table that meet the filter criteria. Here’s an example that illustrates this:

DataTable dt = new Table();

dt.Columns.Add("OrderId", typeof(System.Int32));

dt.Columns.Add("OrderAmount", typeof(System.Decimal));



// ... add some rows



// computes the sum of order amounts for all orders with Id less than 10

Decimal totalOrderAmount = dt.Compute("SUM(OrderAmount)", "OrderId<10")