I need help grouping records via a listview w/in Asp.net

I have the following:

Order1 Top 12.99
Order2 Socks 7.00
Order2 bottoms 23.00
Order1 Underwear 9.00
Order3 Socks 7.00

Should look like this

Order1
items price

Order2
Items Price

Order3


I have a SQL Stored Procedure that I pull in as the Dataource, but it is not grouping. Please help.