public class form1
    inherits system.windows.forms.form

#region " windows 窗体设计器生成的代码 "

    public sub new()
        mybase.new()

        该调用是 windows 窗体设计器所必需的。
        initializecomponent()

        在 initializecomponent() 调用之后添加任何初始化

    end sub

    窗体重写 dispose 以清理组件列表。
    protected overloads overrides sub dispose(byval disposing as boolean)
        if disposing then
            if not (components is nothing) then
                components.dispose()
            end if
        end if
        mybase.dispose(disposing)
    end sub

    windows 窗体设计器所必需的
    private components as system.componentmodel.icontainer

    注意: 以下过程是 windows 窗体设计器所必需的
    可以使用 windows 窗体设计器修改此过程。
    不要使用代码编辑器修改它。
    friend withevents textbox1 as system.windows.forms.textbox
    <system.diagnostics.debuggerstepthrough()> private sub initializecomponent()
        me.textbox1 = new system.windows.forms.textbox
        me.suspendlayout()
       
        textbox1
       
        me.textbox1.location = new system.drawing.point(112, 96)
        me.textbox1.name = "textbox1"
        me.textbox1.tabindex = 0
        me.textbox1.text = ""
       
        form1
       
        me.autoscalebasesize = new system.drawing.size(6, 14)
        me.clientsize = new system.drawing.size(292, 266)
        me.controls.add(me.textbox1)
        me.name = "form1"
        me.text = "form1"
        me.resumelayout(false)

    end sub

#end region
    dim str as string = ""

    private sub textbox1_keyup(byval sender as object, byval e as system.windows.forms.keyeventargs) handles textbox1.keyup
        if (e.keyvalue > 47 and e.keyvalue < 58) or (e.keyvalue > 95 and e.keyvalue < 106) or (e.keyvalue = 8) or (e.keyvalue = 45) or (e.keyvalue = 46) then
            str = textbox1.text
        else
            textbox1.text = str
            textbox1.focus()
        end if
    end sub
end class