Update Statement Not Updating

I can't get my form to update my db.  Is there something wrong with the update statement?  I'm not getting any errors either.  I have two check Box Lists:

Dim strStep1 As String = ""
Dim s As ListItem
For Each s In cblStep1.Items
If s.Selected Then
strStep1 += s.Text + ", "
End If
Next

Dim strStep2 As String = ""
Dim s2 As ListItem
For Each s2 In cblStep2.Items
If s2.Selected Then
strStep2 += s2.Text + ", "
End If
Next

Dim ConnString As String = ConfigurationManager.AppSettings("ConnectionString")
Dim Conn As New SqlConnection(ConnString)
Dim CommandString As String = "UPDATE [tblAccess] SET [complete1] = ?, [complete2] = ?" & _
"WHERE empName = @empName"

Dim Command As New SqlCommand(ConnString, Conn)
Command.Parameters.AddWithValue("complete1", strStep1)
Command.Parameters.AddWithValue("complete2", strStep2)

Any help is appreciated!