Arithmetic operator

I'm using Sql Server reporting tools and creating a report.
How can I display the difference of two fields on a report?

you have 3 text boxes on a form..

say you have two fields...

textbox1.value = fields!myfield1.value

textbox2.value = fields!myfield2.value

then in the value for textbox3 put

= fields!myfield1.value - fields!myfield2.value

QED

Daryl