Add Dashes Between Numbers

Hello,

I'm combining two cells to create a third number in a separate cell using the formula =A1&B1. It works fine but what I'd like to do is add a dash between the two numbers to make it easier to read.

For example: =A1&B1 combines 2 and 3 to make 23 in cell C1 but what I'd rather see in C1 is 2-3 or whatever the case may be.

Thanks Chris

=A1&"-"&B1

Regards