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  1. Imports System.Data.SqlClient
  2. Public Class Form1

  3.     Private CN As SqlConnection

  4.     Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


  5.         CN = New SqlConnection
  6.         CN.ConnectionString = "Data Source =.\SQLEXPRESS;" & _
  7.                               "AttachDbFilename=D:\NorthWind\NORTHWND.MDF;" & _
  8.                               "Integrated Security=True;Connect Timeout=30;User Instance=True"
  9.         CN.Open()
  10.         MessageBox.Show("¸ê®Æ®w¶}啓")


  11.     End Sub


  12.     Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

  13.         CN.Close()
  14.         CN.Dispose()
  15.         MessageBox.Show("¸ê®ÆÃö³¬")
  16.     End Sub

  17. End Class
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  1. Imports System.Data.SqlClient


  2. Public Class Form1

  3.     Private CN As SqlConnection

  4.     Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


  5.         CN = New SqlConnection
  6.         CN.ConnectionString = "Data Source =.\SQLEXPRESS;" & _
  7.                               "AttachDbFilename=D:\NorthWind\NORTHWND.MDF;" & _
  8.                               "Integrated Security=True;Connect Timeout=30;User Instance=True"

  9.         AddHandler CN.StateChange, AddressOf CNOnStateChanging
  10.         CN.Open()
  11.         MessageBox.Show("¸ê®Æ®w¶}啓")


  12.     End Sub


  13.     Private Sub CNOnStateChanging(ByVal sender As Object, ByVal e As System.Data.StateChangeEventArgs)

  14.         MessageBox.Show(e.CurrentState.ToString)

  15.     End Sub

  16.     Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

  17.         CN.Close()
  18.         CN.Dispose()
  19.         MessageBox.Show("¸ê®ÆÃö³¬")
  20.     End Sub

  21. End Class
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