呵呵，培训时老师讲的简单例子，俺自己作了一下，还可以运行。
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public Class ChinaRing1
Inherits System.Web.UI.Page
#Region " Web 窗体设计器生成的代码 "
'该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Protected WithEvents ChinaRingCkBox1 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox2 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox3 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox4 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox5 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox6 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox7 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox8 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingCkBox9 As System.Web.UI.WebControls.CheckBox
Protected WithEvents ChinaRingLb1 As System.Web.UI.WebControls.Label
Protected ChinaRingCkBox(8) As System.Web.UI.WebControls.CheckBox
'注意: 以下占位符声明是 Web 窗体设计器所必需的。
'不要删除或移动它。
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
'不要使用代码编辑器修改它。
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ChinaRingCkBox(0) = ChinaRingCkBox1
ChinaRingCkBox(1) = ChinaRingCkBox2
ChinaRingCkBox(2) = ChinaRingCkBox3
ChinaRingCkBox(3) = ChinaRingCkBox4
ChinaRingCkBox(4) = ChinaRingCkBox5
ChinaRingCkBox(5) = ChinaRingCkBox6
ChinaRingCkBox(6) = ChinaRingCkBox7
ChinaRingCkBox(7) = ChinaRingCkBox8
ChinaRingCkBox(8) = ChinaRingCkBox9
End Sub
Private Sub ChinaRingCkBox1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox1.CheckedChanged
ChinaRingCkBox_CheckedChanged(1, sender, e)
End Sub
Private Sub ChinaRingCkBox2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox2.CheckedChanged
ChinaRingCkBox_CheckedChanged(2, sender, e)
End Sub
Private Sub ChinaRingCkBox3_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox3.CheckedChanged
ChinaRingCkBox_CheckedChanged(3, sender, e)
End Sub
Private Sub ChinaRingCkBox4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox4.CheckedChanged
ChinaRingCkBox_CheckedChanged(4, sender, e)
End Sub
Private Sub ChinaRingCkBox5_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox5.CheckedChanged
ChinaRingCkBox_CheckedChanged(5, sender, e)
End Sub
Private Sub ChinaRingCkBox6_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox6.CheckedChanged
ChinaRingCkBox_CheckedChanged(6, sender, e)
End Sub
Private Sub ChinaRingCkBox7_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox7.CheckedChanged
ChinaRingCkBox_CheckedChanged(7, sender, e)
End Sub
Private Sub ChinaRingCkBox8_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox8.CheckedChanged
ChinaRingCkBox_CheckedChanged(8, sender, e)
End Sub
Private Sub ChinaRingCkBox9_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChinaRingCkBox9.CheckedChanged
ChinaRingCkBox_CheckedChanged(9, sender, e)
End Sub
Private Sub ChinaRingCkBox_CheckedChanged(ByVal index As Integer, ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim i As Integer
i = 0
Dim ChinaRingCk As Boolean = False
If index = 1 Then
ChinaRingCk = True
Else
If ChinaRingCkBox(index - 2).Checked Then
ChinaRingCk = True
End If
Do While i < index - 2
If ChinaRingCkBox(i).Checked Then
ChinaRingCk = False
End If
i = i + 1
Loop
End If
If Not ChinaRingCk Then
ChinaRingCkBox(index - 1).Checked = Not ChinaRingCkBox(index - 1).Checked
'可以在这里加一个提示，根据条件提示不能套入，或不能拿出该环。
End If
End Sub
End Class
