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