?Application 對象是存儲于服務器的全局變量 ?Cookie 存儲信息于客戶端 ?Session 對象用于在服務器端存儲用戶的信息，在用戶結束會話時被清除

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1.將信息寫入Cookies 中/

方式一
//HttpCookie hcName = new HttpCookie("UserName", this.txtName.Text);
//HttpCookie hcPwd = new HttpCookie("UserPwd", this.txtPassword.Text);
//hcName.Expires = DateTime.Now.AddDays(double.Parse(this.ddlDays.SelectedValue));
//hcPwd.Expires = DateTime.Now.AddDays(double.Parse(this.ddlDays.SelectedValue));

//this.Response.Cookies.Add(hcName);
//this.Response.Cookies.Add(hcPwd);

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讀取

HttpCookie hcPwd = this.Request.Cookies["UserPwd"];
string s = "";
s = hcPwd.Value;

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方式二

HttpCookie hc = new HttpCookie("User");
hc.Values.Add("name", this.txtName.Text.Trim());
hc.Values.Add("pwd", this.txtPassword.Text.Trim());
hc.Expires = DateTime.Now.AddDays(double.Parse(this.ddlDays.SelectedValue));
//將cookie對象寫入客戶端
this.Response.Cookies.Add(hc);

讀取

HttpCookie hc = this.Request.Cookies["User"];

string s = "";

if (hc != null)
{
s += "從Cookies中讀取的姓名是:" + hc.Values["name"].ToString() + "<br/>讀取的密碼是：" + hc.Values["pwd"].ToString();
}
else
{
s += "沒有Cookie對象！";
}

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2 刪除cookie

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總結

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