Application_BeginRequest事件过滤恶意提交

Global.asax

protected void Application_BeginRequest(object sender, EventArgs e)
    {
        //遍历Post参数，隐藏域除外 
        foreach (string i in this.Request.Form)
        {
            if (i == "__VIEWSTATE") continue;
            this.goErr(this.Request.Form[i].ToString());
        }
        //遍历Get参数。 
        foreach (string i in this.Request.QueryString)
        {
            this.goErr(this.Request.QueryString[i].ToString());
        }
    }
    private void goErr(string tm)
    {
        if (SqlFilter2(tm))
        {
            Response.Redirect("p404.html");
            Response.End();
        }
    }
    public static bool SqlFilter2(string InText)
    {
        string word = "and|exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join";
        if (InText == null)
            return false;
        foreach (string i in word.Split('|'))
        {
            if ((InText.ToLower().IndexOf(i + " ") > -1) || (InText.ToLower().IndexOf(" " + i) > -1))
            {
                return true;
            }
        }
        return false;
    }