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//Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));// 使用Cookies取验证码的值
Session["CheckCode"] = code.ToUpper();
//if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox2.Text.ToString(), true) != 0)
if (String.Compare(Session["CheckCode"].ToString(), TextBox3.Text.ToString(), true) != 0)