Dropdownlist OnSelectedIndexChanged event in edit mode of datalist

Hey Guys,
I have 2 dropdown lists in a datalist that are populated when you enter into edit mode. I was wondering how to changed the second dropdownlist's datasource when the first one's OnSelectedIndexChanged event is fired.

I put this code in the first dropdownlist

VB Code:

OnSelectedIndexChanged=SelectionChanged

and this in the codebehind:

VB Code:

Sub SelectionChanged(ByVal sender As Object, _
                       ByVal e As DataListCommandEventArgs)
        Dim strCategoryID As String
        Dim subcat As DropDownList
 
        strCategoryID = CType(e.Item.FindControl("Category1"), _
                                  DropDownList).SelectedItem.Value
 
        Dim objConnection As OleDbConnection
        Dim objCommand As OleDbCommand
        Dim strSQLQuery As String
        Dim groupid As OleDbDataReader
 
 
 
        objConnection = New OleDbConnection(ConfigurationSettings.AppSettings("ConnectionString"))
 
 
 
        strSQLQuery = "Select * from subgroupsingroups where idGroup=" & CInt(strCategoryID)
        objConnection.Open()
 
 
 
        objCommand = New OleDbCommand(strSQLQuery, objConnection)
 
        groupid = objCommand.ExecuteReader()
 
 
        objConnection.Close()
 
        subcat = e.Item.FindControl("Category2")
        subcat.DataSource = groupid
        subcat.DataBind()
 
 
    End Sub

I need to figure out how to pass the two arguments(Byval sender As Object, ByVal e As DataListCommandEventArgs) from the dropdownlist to the Sub SelectionChanged.

Any ideas???

Thanks,
Bebandit