將HTML標籤轉成文字-HtmlEncode

'在前台<%@ Page %>'插入ValidateRequest="false"

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default"  ValidateRequest="false"%>

' Visual BasicPrivate Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim userinput As String = TextBox1.Text
userinput = Server.HtmlEncode(userinput)' Accepts , , , , case-insensitive
userinput = userinput.Replace("<b>", "")
userinput = userinput.Replace("</b>", "")
userinput = userinput.Replace("<B>", "")
userinput = userinput.Replace("</B>", "")
userinput = userinput.Replace("<u>", "")
userinput = userinput.Replace("</u>", "")
userinput = userinput.Replace("<U>", "")
userinput = userinput.Replace("</U>", "")
Label1.Text = userinput
End Sub