Add field programmatically to crystal report.

Hi guys, i have this SQL query.
"SELECT SUM (TotalTaskCost) AS "CombinedTaskCost" FROM TaskCost;"

I want to display the values vertically in a crystal report.

How do i programmatically add a field for the artificial column "CombinedTaskCost" generated by the SQL query?

Thanks. Im doing this in Visual C#, ASP.NET