SQL query into an array

Hi,

I am trying to write a powershell script to read some values out of a database and then put them into an two dimension array.

My SQL query will return:

User, Group

User a, Group 1
User a, Group 2
User b, Group 2
User c, Group 3
User d, Group 5

etc

I would like to get the data read into an array so that I can read out the values later in the script. For example:

$table[0][0] should return User a
$table[0][1] should return Group 1

I first setup the connection with this code.

$Connection = New-Object System.Data.SQLClient.SQLConnection
$Connection.ConnectionString = "server=xxx;database=yyy;trusted_connection=true;"
$Connection.Open()
$Command = New-Object System.Data.SQLClient.SQLCommand
$Command.Connection = $Connection
# Put the SQL query below
$Command.CommandText = "select user, group from xxx"
$Reader = $Command.ExecuteReader()

Then I loop through the $Reader object and try and read all the values into an array

$table = @()
$intCounter = 0
 while($Reader.Read())
 {
 #write-host $Reader    
 $user = $Reader["User_Name"].ToString()    
 $group = $Reader["Group_Name"].ToString()  
 Write-Host "$user $group $intCounter"
 $table += @($user,$group)
 $intCounter++
 }  
$Connection.Close()

The line Write-Host "$User $Group $intCounter"  displays the users and the groups, so I know that $user and $group have values in them.

I think that the problem is that I have just defined a 1 dimension array  $table = @(),   as $table[0] returns  User a and $table[1] returns Group 1.

So 2 questions:

1. How do I define a multidimension array      $table = @()()  ?

2. If I am on the wrong track, how should I attack this?