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。   
QQ:5478740     
wildcatsky（原作）   
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