ASP.NET基础培训 - Cookie的正确利用

//First Way
HttpCookie StudentCookies = new HttpCookie("StudentCookies");
StudentCookies.Value = TextBox1.Text;
StudentCookies.Expires = DateTime.Now.AddHours(1);
Response.Cookies.Add(StudentCookies);

//Second Way
Response.Cookies["StudentCookies"].Value = TextBox1.Text;
Response.Cookies["StudentCookies"].Expires = DateTime.Now.AddDays(1);

//Writing Multiple values in single cookie
Response.Cookies["StudentCookies"]["RollNumber"] = TextBox1.Text;
Response.Cookies["StudentCookies"]["FirstName"] = "Abhimanyu";
Response.Cookies["StudentCookies"]["MiddleName"] = "Kumar";
Response.Cookies["StudentCookies"]["LastName"] = "Vatsa";
Response.Cookies["StudentCookies"]["TotalMarks"] = "499";
Response.Cookies["StudentCookies"].Expires = DateTime.Now.AddDays(1); 

string roll = Request.Cookies["StudentCookies"].Value; 

//For Multiple values in single cookie
string roll;
roll = Request.Cookies["StudentCookies"]["RollNumber"];
roll = roll + " " + Request.Cookies["StudentCookies"]["FirstName"];
roll = roll + " " + Request.Cookies["StudentCookies"]["MiddleName"];
roll = roll + " " + Request.Cookies["StudentCookies"]["LastName"];
roll = roll + " " + Request.Cookies["StudentCookies"]["TotalMarks"];
Label1.Text = roll; 

if (Request.Cookies["StudentCookies"] != null)
{
    Response.Cookies["StudentCookies"].Expires = DateTime.Now.AddDays(-1);
    Response.Redirect("Result.aspx");  //to refresh the page
}