how to store and retrieve data from cookies

//This example shows that how to store and retrieve data from cookies.
// http://www.hanusoftware.com

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
if(!IsPostBack)
{
if(Request.Cookies["UserCook"] != null)
{
chkRemember.Checked = true;
HttpCookie cook = Request.Cookies["UserCook"];
txtUserName.Text = cook["UserName"].ToString();

}
}
}
private void btnSubmit_Click(object sender, System.EventArgs e)
{
try
{
if(chkRemember.Checked == true)
{
if(Request.Browser.Cookies == true)
{
HttpCookie loginCook = new HttpCookie("UserCook");
loginCook["UserName"] = txtUserName.Text.Trim();
loginCook.Expires = DateTime.MaxValue;
Response.Cookies.Add(loginCook);
}
else
{
lblErr.Text = "Please enable your cookies in Internet
option in Explorer.";
}
}
if(txtUserName.Text.Trim() == "developer" &&
txtPwd.Text.Trim() == "developer")
{
Session["UserId"] = txtUserName.Text.Trim();
Response.Redirect("Querystring.aspx?Usertype=Web Developer");
}
else if(txtUserName.Text.Trim()=="admin" && txtPwd.Text.Trim()== "admin")
{
Session["UserId"] = txtUserName.Text.Trim();
string str = Server.UrlEncode("Administrator+");

Response.Redirect("Querystring.aspx?UserType="+str);
}
else
{
lblErr.Text = "Invalid user id and password.";
}
}
catch(Exception ex)
{
Response.Write(ex.Message);
}
}
}
}





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