随机生成的验证码值保存到cookie,麻烦高手指点下
页面1(后台):
string tmp=(随机生成代码);
HttpCookie checkCode1 = new HttpCookie("ImageV");
checkCode1.Values.Add("checkCode", tmp);
Response.Cookies.Add(checkCode1);
页面2(后台):
HttpCookie checkCode2 = Request.Cookies["ImageV"];
TextBox3.Text = checkCode2.Values["checkCode"].ToString(); //该句测试用
错误信息:
行 21: TextBox3.Text = checkCode2.Values["checkCode"].ToString();
未将对象引用设置到对象的实例。
页面1(后台):
string tmp=(随机生成代码);
HttpCookie checkCode1 = new HttpCookie("ImageV");
checkCode1.Values.Add("checkCode", tmp);
Response.Cookies.Add(checkCode1);
页面2(后台):
HttpCookie checkCode2 = Request.Cookies["ImageV"];
TextBox3.Text = checkCode2.Values["checkCode"].ToString(); //该句测试用
错误信息:
行 21: TextBox3.Text = checkCode2.Values["checkCode"].ToString();
未将对象引用设置到对象的实例。
string username=Request.Cookies["mycookie"]["username"] HttpCookie cookie = Request.Cookies[""];
if (cookie!=null)
string usernamet = cookie[""];
HttpCookie aCookie = new HttpCookie("checkCode");
aCookie.Value = value;
aCookie.Expires = DateTime.Now.AddDays(20);
Response.Cookies.Add(aCookie);
//读
if (Request.Cookies["checkCode"] != null)
{
HttpCookie aCookie = Request.Cookies["checkCode"]; return aCookie.Value.ToString();
}