ListBox MultiSelect Link To Query

I found the following code to make a listbox send multiple choices to a text box. I want the code to send multiple choices to a query and open the query.
The query is titled qryStudentListing2. The field that should relate to ListBox1 is qryStudentListing2.Class. I don't know where to put the query reference in the following code. It now sends the choices to a textbox called MySelections

Here is the code:
Private Sub Form_Current()
Dim oItem As Variant
Dim bFound As Boolean
Dim sTemp As String
Dim sValue As String
Dim sChar As String
Dim iCount As Integer
Dim iListItemsCount As Integer

sTemp = Nz(Me!mySelections.Value, " ")
iListItemsCount = 0
bFound = False
iCount = 0

Call clearListBox

For iCount = 1 To Len(sTemp) + 1
sChar = Mid(sTemp, iCount, 1)
If StrComp(sChar, ",") = 0 Or iCount = Len(sTemp) + 1 Then
bFound = False
Do
If StrComp(Trim(Me!NamesList.ItemData(iListItemsCount )), Trim(sValue)) = 0 Then
Me!NamesList.Selected(iListItemsCount) = True
bFound = True
End If
iListItemsCount = iListItemsCount + 1
Loop Until bFound = True Or iListItemsCount = Me!NamesList.ListCount
sValue = ""
Else
sValue = sValue & sChar
End If
Next iCount
End Sub

Private Sub clearListBox()
Dim iCount As Integer

For iCount = 0 To Me!NamesList.ListCount
Me!NamesList.Selected(iCount) = False
Next iCount
End Sub

Private Sub testmultiselect_Click()
Dim oItem As Variant
Dim sTemp As String
Dim iCount As Integer

iCount = 0

If Me!NamesList.ItemsSelected.Count <> 0 Then
For Each oItem In Me!NamesList.ItemsSelected
If iCount = 0 Then
sTemp = sTemp & Me!NamesList.ItemData(oItem)
iCount = iCount + 1
Else
sTemp = sTemp & "," & Me!NamesList.ItemData(oItem)
iCount = iCount + 1
End If
Next oItem
Else
MsgBox "Nothing was selected from the list", vbInformation
Exit Sub 'Nothing was selected
End If

Me!mySelections.Value = sTemp
End Sub

Private Sub clrList_Click()
Call clearListBox
Me!mySelections.Value = Null
End Sub

Any suggestions about how to alter this code would be SO helpful.
Ronna