第一：用if……end if 判斷
public class form1
private sub btnok_click(byval sender as system.object, byval e as system.eventargs) handles btnok.click
dim strname as string
strname = txtname.text
if string.compare(strname, "bryan", true) = 0 then '選true時，不區分大小寫，字串匹配，返回0，選false時，區分大小寫，字串不匹配，返回-1
msgbox("hello, bryan!", vbokonly or msgboxstyle.information, "忽略大小寫試驗")
end if
end sub
private sub btnexit_click(byval sender as system.object, byval e as system.eventargs) handles btnexit.click
me.close()
end sub
end class
第二：用 select case 判斷
public class form1
private sub btnok_click(byval sender as system.object, byval e as system.eventargs) handles btnok.click
dim strname as string
strname = txtname.text
select case strname.toupper '把字串轉換成大寫
case "a"
txtname.text = "madras yellow"
case "b"
txtname.text = "sea blue"
case "c"
txtname.text = "morning mist"
case "d"
txtname.text = "passionate purple"
case "e"
txtname.text = "red"
case else
txtname.text = "資料越界"
end select
end sub
private sub btnexit_click(byval sender as system.object, byval e as system.eventargs) handles btnexit.click
me.close()
end sub
end class
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