描述：窗体加载即连接数据库按，以便验证登录信息正确与否；若正确，关闭此窗体进行下次连接；
问题：我是在Form_load里面打开的数据库，不知道从拿下手关闭，导致下个窗体连接失败，请各位不吝赐教，万分感谢！
过程如下：

Option Explicit
Dim cnt As Integer
Dim conn As New ADODB.Connection
Dim userID As String
Dim userpow As String
---------------------------------
Private Sub Form_Load()
    Dim connectionstring As String
    Dim rs_login As New ADODB.Recordset
connectionstring = "provider=Microsoft.Jet.oledb.4.0;" & "data source=D:\vb6\实例\登录设定\xiayier.mdb"
conn.Open connectionstring
    cnt = 0
    End Sub
--------------------------------
Private Sub Image1_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
    If Trim(text1.Text) = "" Then
       MsgBox "该用户名无效，请重新输入!", vbOKOnly + vbExclamation, "系统提示"
       text1.SetFocus
       text1.Text = ""
       text2.Text = ""
Else
   sql = "select * from 密码表 where 用户名称='" & text1.Text & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   If rs_login.EOF = True Then
      MsgBox "该用户名无效，请重新输入!", vbOKOnly + vbExclamation, "系统提示"
      text1.SetFocus
      text1.Text = ""
      text2.Text = ""      
Else
      If Trim(rs_login.Fields(2)) = Trim(text2.Text) Then
          userID = text1.Text
          userpow = rs_login.Fields(2)
          rs_login.Close
          Unload Me
          Form2.Show
Else
         MsgBox "密码不正确，请重新输入", vbOKOnly + vbExclamation, "系统提示"
         text2.SetFocus
         text1.Text = ""
         text2.Text = ""
      End If
   End If
End If
    cnt = cnt + 1
If cnt = 5 Then
   Unload Me
End If
    Exit Sub
rs_login.Close
Set rs_login = Nothing
End Sub

请问各位大侠这个该怎么修改？从哪里去关闭连接？新手盼回。