How To Convert The DataTable Column type?

Question

I am trying to implement:

dtGroupedBy.Compute(\"sum(POWER)\",dvv.RowFilter); 

It results of an error:

Invalid usage

Answer 1

It will depend on how you've created the DataTable. If it's just straight from SQL, you should look into changing the SQL itself so that the POWER column is converted as you fetch it.

However, if the value should always be numeric in the first place, I would strongly suggest that you revisit your database schema - it would be cleaner to change the column type if you possible can.