I have an SSRS report with a table that shows two numeric columns and the difference between them
I'm using the report builder that comes with VS 2013. It's a local report associated with a Winform app.
I wanted to sum the differences and couldn't see a straightforward way to sum an expression.

I found some convoluted solutions on the web but decided instead to add a computed column to the dataset and used that.

Is there a better way?