Private Sub ToolBar1_ButtonClick()Sub ToolBar1_ButtonClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ToolBarButtonClickEventArgs) Handles ToolBar1.ButtonClick
 Select Case e.Button.Text
Case "OK" ''''"OK" is ToolBarButton.Text
If fr Is Nothing Or fr.IsDisposed Then
fr = New frmName
With fr
.MdiParent = Me
.Show()
End With
Else
With fr
.MdiParent = Me
.Show()
.Focus()
End With
End If
End Select
 End Sub
所以大家使用的时候要当心点
分析,就是关闭了实例了一次的窗口后,fr is nothing ,所以fr是不被with所使用的,改了with的使用范围之后就没有错误出现.
---end---
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