VS 2008 Database Search - Using SQLClient That Loops Though All Users In A Users Table

I've got a code using SQLClient that loops though all users in a Users table inside each loop i want to preform another search in the UserOrders table, thus doing a count of all orders.

I get this error

HTML

There is already an open DataReader associated with this Command which must be closed first.

Here is my code

vb.net UserLists.Items.Clear()
Dim connection As New SqlClient.SqlConnection(My.Settings.ConnectString)
Dim command As New SqlClient.SqlCommand("SELECT * FROM Users ORDER BY PersonName",

[CODE]...