How to calculate difference between two text boxes

[fuhrj]

I have two text boxes in the footer group that I need to display the difference. I tried this, but it doesn't work:

{ System.Convert.ToDouble(Text23.Text) - System.Convert.ToDouble(Text.22.Text)}

Because of the way our database is set-up, I can't subtract using the Sum function:

[HighAley]

Hello.

I have two text boxes in the footer group that I need to display the difference. I tried this, but it doesn't work:

{ System.Convert.ToDouble(Text23.Text) - System.Convert.ToDouble(Text.22.Text)}

Because of the way our database is set-up, I can't subtract using the Sum function:

You couldn't use Text23.Text in the footer. Please, send us your report template for analysis and explain what do you want to get more detailed.

Thank you.