Login through cookies
Different forums are filled with the questions regarding how to manually implement cookies for login or in other words how to implement "Remeber me" option.
Following is the code that will give the idea of how to achieve this task.
Controls used
1. TextBox, ID =
TbUserName
2. TextBox, ID = TbPassword
3.
CheckBox, ID = CbRememberMe
4. Button, ID = BtLogin
5.
LinkButton, ID = lbSignout
------------------If you are using VB.Net-------------------------
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e
As System.EventArgs) Handles Me.Load
If Not
IsPostBack Then
'Check if the browser
support cookies
If Request.Browser.Cookies
Then
'Check if the cookies with name
PBLOGIN exist on user's machine
If
Request.Cookies("PBLOGIN") IsNot Nothing Then
'Pass the user name and password to the VerifyLogin
method
Me.VerifyLogin(Request.Cookies("PBLOGIN")("UNAME").ToString(),
Request.Cookies("PBLOGIN")("UPASS").ToString())
End If
End If
End If
End Sub
Protected Sub BtLogin_Click(ByVal sender As Object,
ByVal e As System.EventArgs)
'check if remember
me checkbox is checked on login
If
(Me.CbRememberMe.Checked) Then
'Check if
the browser support cookies
If
(Request.Browser.Cookies) Then
'Check
if the cookie with name PBLOGIN exist on user's machine
If (Request.Cookies("PBLOGIN") Is Nothing) Then
'Create a cookie with expiry of 30 days
Response.Cookies("PBLOGIN").Expires =
DateTime.Now.AddDays(30)
'Write
username to the cookie
Response.Cookies("PBLOGIN").Item("UNAME") =
Me.TbUserName.Text
'Write password
to the cookie
Response.Cookies("PBLOGIN").Item("UPASS") =
Me.TbPassword.Text
'If the cookie already exist then
wirte the user name and password on the cookie
Else
Response.Cookies("PBLOGIN").Item("UNAME") =
Me.TbUserName.Text
Response.Cookies("PBLOGIN").Item("UPASS") =
Me.TbPassword.Text
End If
End If
End If
Me.VerifyLogin(Me.TbUserName.Text,
Me.TbPassword.Text)
End Sub
Protected Sub VerifyLogin(ByVal UserName As String,
ByVal Password As String)
Try
'If login credentials are correct
'Redirect to the user page
'else
'prompt user for invalid password
'end
if
Catch ex as System.Exception
Response.Write(ex.Message)
End Try
End
Sub
Protected Sub lbSignout_Click(ByVal sender As Object,
ByVal e As System.EventArgs) Handles lbSignout.Click
'Check
iIf the cookies with name PBLOGIN exist on user's machine
If (Request.Cookies("PBLOGIN") IsNot Nothing) Then
'Expire the cookie
Response.Cookies("PBLOGIN").Expires =
DateTime.Now.AddDays(-30)
End If
'Redirect to the login page
End Sub
End
Class
------------------If you are using C#.Net-------------------------
partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender,
System.EventArgs e)
{
if
(!IsPostBack)
{
//Check if
the browser support cookies
if
(Request.Browser.Cookies)
{
//Check if the cookies with name
PBLOGIN exist on user's machine
if
(Request.Cookies("PBLOGIN") != null)
{
//Pass the user name and password
to the VerifyLogin method
this.VerifyLogin(Request.Cookies("PBLOGIN")("UNAME").ToString(),
Request.Cookies("PBLOGIN")("UPASS").ToString());
}
}
}
}
protected void
BtLogin_Click(object sender, System.EventArgs e)
{
//check if remember me checkbox is checked on
login
if ((this.CbRememberMe.Checked))
{
//Check if the browser
support cookies
if
((Request.Browser.Cookies))
{
//Check if the cookie with name
PBLOGIN exist on user's machine
if
((Request.Cookies("PBLOGIN") == null))
{
//Create a cookie with expiry of
30 days
Response.Cookies("PBLOGIN").Expires =
DateTime.Now.AddDays(30);
//Write
username to the cookie
Response.Cookies("PBLOGIN").Item("UNAME") =
this.TbUserName.Text;
//Write
password to the cookie
Response.Cookies("PBLOGIN").Item("UPASS") =
this.TbPassword.Text;
}
//If the cookie already exist then
wirte the user name and password on the cookie
else
{
Response.Cookies("PBLOGIN").Item("UNAME") =
this.TbUserName.Text;
Response.Cookies("PBLOGIN").Item("UPASS") =
this.TbPassword.Text;
}
}
}
this.VerifyLogin(this.TbUserName.Text,
this.TbPassword.Text);
}
protected void VerifyLogin(string UserName, string Password)
{
try
{
//If login credentials are correct
//Redirect to the user page
//else
//prompt
user for invalid password
//end if
}
catch (System.Exception ex)
{
Response.Write(ex.Message);
}
}
protected void
lbSignout_Click(object sender, System.EventArgs e)
{
//Check iIf the cookies with name PBLOGIN
exist on user's machine
if
((Request.Cookies("PBLOGIN") != null))
{
//Expire the cookie
Response.Cookies("PBLOGIN").Expires =
DateTime.Now.AddDays(-30);
}
//Redirect to the login page
}
}