if you are not suppressing any rows

If (Recordnumber Mod 2 = 0) Then Color (R,G,B) Else crNocolor;

 

othwise you need a RT to get the value for each row (a counter)

If ({#RT} Mod 2 = 0) Then Color (R,G,B) Else crNocolor;

Edited by DBlank - 09 Jun 2011 at 9:56am

I got it.  I changed the formula to the follow:

You can also use:
select RecordNumber mod2
case 0:crWhite
case 1: color(225,225,225)
default: crWhite //this line is optional

Or you can apply it for groups by changing it to

select GroupNumber mod2
case 0:crWhite
case 1:color(225,225,225)
default: crWhite //this line is optional

If you want to do 2 lines at a time then:

If Remainder(RecordNumber, 4) In [1,2] Then crSilver
Else NoColor