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());
        }

    }

/// <summary>
///SQL注入过滤
/// </summary>
/// <param name="InText">要过滤的字符串</param>
/// <returns>如果参数存在不安全字符，则返回true</returns>
    public static bool SqlFilter2(string InText)
    {
string word = ConfigurationManager.AppSettings["RequestForbidWord"].ToString();
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;
    }
//// <summary>
/// 校验参数是否存在SQL字符
/// </summary>
/// <param name="tm"></param>
    private void goErr(string tm)
    {
//string Errorpage = ConfigurationManager.AppSettings["SqlErrorpage"].ToString();
        if (SqlFilter2(tm))
        {
this.Response.Redirect("/ErrorForm.aspx");
        }
    }

<add key="RequestForbidWord" value="and|exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join|script&gt;|drop|alter|create"/>