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Creating a page to log out users

From: ASP.NET Essential Training

Video: Creating a page to log out users

In websites that require the users to login before they can have access to the sites resources, you typically want to create an explicit Logout feature. Even though the user can logout by closing all of their browser windows. The users don't always know that and it gives them a sense of security knowing that there is something they can click on to explicitly logout from the site. For this demonstration I'll start in the controls file Header.ascx. In this file there is a panel that contains a number of hyperlinks. Right now the user navigates around the website by using the hyperlinks in the panel starting at line 12.

Creating a page to log out users

In websites that require the users to login before they can have access to the sites resources, you typically want to create an explicit Logout feature. Even though the user can logout by closing all of their browser windows. The users don't always know that and it gives them a sense of security knowing that there is something they can click on to explicitly logout from the site. For this demonstration I'll start in the controls file Header.ascx. In this file there is a panel that contains a number of hyperlinks. Right now the user navigates around the website by using the hyperlinks in the panel starting at line 12.

I will look at the file in Design view and I'll show you that it has the hyperlinks and when you are looking at it in Design view, you won't see all the styles applied. So it doesn't look quite the way it will in the whole website. I'll click into the panel that contains the hyperlinks. I'll click into the panel that contains the hyperlinks, put in a spacebar, pipe character, which is the character on this same key as the backslash. Just press the Shift key when pressing that key and you will get that separator character. Then put in another space. Instead of creating an explicit hyperlink, I'll use another one of the Login controls. I'll go to the Toolbox to the login section and I'll drag in a LoginStatus object. The LoginStatus object has two states. The default state shown here is called the Logged Out state and it creates a hyperlink that takes the user to the login page. In the Logged In state, it shows a hyperlink with the text Logout and when the user clicks on that link, it logs them out and redirects them back to the Login page.

Now I'll save the changes and then I'll open up the file styles.css. In this file there is a class selector for menuPanel. It's at line 16 and the menuPanel rules include a width property that's setting the width of that panel to 250 pixels. Because I have added a new Hyperlink I need to make it wider. I'll change it from 250 pixels to 300 pixels. I'll save my changes by pressing Ctrl+S and then I'll close that file. Now I'll open up the Titles.aspx page and I'll run it in the browser. Because I have locked down the website, I'm not initially logged in, I'm taken to the Log In form. Notice the image is broken for the moment. We'll fix that in a moment.

I'll login with my username and password, newuser and the password I created, and then I'm directed to the Titles page or whichever page I requested. And here is Logout link. Notice that the user doesn't see any difference between the explicit hyperlink and one that is created by an ASP. NET control, such as the Log In status control and now I'll click the Log Out link and that takes me back to the Log In page. So now you have a way for the user to login and logout. So now about the image.

The image is broken because when you Log Out, you are no longer authenticated against the website and the web server is preventing your accessing resources on the website. So in the Log In form your best approach is to strip it of all visual elements other than the Log In components itself. Close the browser and reopen the file Login.aspx and I'll scroll down to the panel containing the image. It's at line 11 on my file. Now simply delete the entire panel. So now all I'm left with, it's a login component wrapped inside a paragraph. I'll save my changes, run the page in the browser and there is the Login form.

Any styling that you want to apply should be done directly in the page, rather than in the external style sheet. This is because that external style sheet file may not load into the browser correctly when the user isn't logged in due to the restrictions of the ASP.NET authentication model. But you now have a complete system. The user can log in, I'll click into the form and type in the username and the password and press Enter. As long as I keep the browser open, I can navigate around the website freely and when I click the Logout link, I'm taken back to the Log In form and I can then either Log In again or close the browser.

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This video is part of

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ASP.NET Essential Training

79 video lessons · 49872 viewers

David Gassner
Author

 
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  1. 18m 44s
    1. Welcome
      1m 42s
    2. Prerequisites
      2m 21s
    3. Using the exercise files
      1m 32s
    4. Upgrading exercise file websites for ASP.NET 4.5 (NEW)
      2m 40s
    5. What's new in ASP.NET 4 (NEW)
      3m 48s
    6. What's new in ASP.NET 4.5 (NEW)
      3m 23s
    7. What's new in this course update (NEW)
      3m 18s
  2. 33m 34s
    1. Understanding how ASP.NET works
      5m 52s
    2. Installing Microsoft Visual Web Developer 2008
      3m 43s
    3. Installing Visual Studio Express 2012 for web (NEW)
      2m 12s
    4. Hello World: Creating your first ASP.NET web site
      4m 28s
    5. Creating pages with dynamic output
      7m 39s
    6. Understanding the development web server
      4m 49s
    7. Exploring the development environment
      4m 51s
  3. 40m 2s
    1. Understanding Microsoft SQL Server
      5m 47s
    2. Installing SQL Server Express
      6m 51s
    3. Exploring SQL Server Management Studio Basic
      4m 23s
    4. Creating a new database
      8m 51s
    5. Connecting to the database in ASP.NET
      5m 35s
    6. Testing SQL queries
      3m 53s
    7. Presenting a dataset in an ASP.NET page
      4m 42s
  4. 25m 31s
    1. Understanding ASP.NET web form pages
      5m 51s
    2. Separating presentation and logic with code files
      4m 17s
    3. Adding web form controls to a page
      5m 25s
    4. Handling postback data in a web form page
      5m 50s
    5. Using data binding expressions
      4m 8s
  5. 48m 37s
    1. Creating a testing environment
      4m 40s
    2. Declaring and using a simple variable
      6m 14s
    3. Declaring and using a complex object
      6m 16s
    4. Using loops
      6m 52s
    5. Using functions
      9m 25s
    6. Using trace statements
      4m 47s
    7. Debugging with breakpoints
      5m 45s
    8. Commenting code
      4m 38s
  6. 17m 43s
    1. Creating web controls
      5m 53s
    2. Registering a user control on a web form page
      3m 25s
    3. Registering controls globally in the web.config file
      3m 53s
    4. Adding public properties to a web control
      4m 32s
  7. 19m 7s
    1. Understanding Cascading Style Sheets (CSS)
      5m 36s
    2. Attaching external CSS files
      3m 12s
    3. Defining a CSS selector
      6m 10s
    4. Using CSS class selectors in server controls
      4m 9s
  8. 30m 34s
    1. Presenting data with the GridView control
      5m 49s
    2. Controlling GridView paging and appearance
      5m 46s
    3. Editing data with the GridView control
      6m 57s
    4. Presenting data with the DataList control
      5m 42s
    5. Formatting data with binding expressions
      6m 20s
  9. 36m 46s
    1. Using the DetailsView control
      7m 33s
    2. Inserting data with the DetailsView control
      6m 36s
    3. Redirecting page requests
      9m 39s
    4. Creating an update page
      6m 20s
    5. Linking to update pages from the list page
      4m 3s
    6. Deleting database records
      2m 35s
  10. 22m 15s
    1. Customizing forms with item editing templates
      6m 7s
    2. Adding validator controls to a form
      6m 40s
    3. Controlling the validation error message display
      6m 24s
    4. Using the ValidationSummary control
      3m 4s
  11. 29m 49s
    1. Creating a query with joined tables
      8m 6s
    2. Replacing control style properties with CSS
      5m 50s
    3. Creating a CSS file for printing
      3m 14s
    4. Suppressing elements in printed web pages
      5m 47s
    5. Selecting data for a report
      6m 52s
  12. 11m 14s
    1. Understanding ViewState and managing postbacks
      4m 36s
    2. Using session variables
      6m 38s
  13. 20m 57s
    1. Turning on forms authentication
      1m 51s
    2. Creating a page to log in users
      4m 18s
    3. Creating a page to set up new users
      4m 6s
    4. Understanding the security database
      3m 27s
    5. Configuring security in the web.config file
      2m 59s
    6. Creating a page to log out users
      4m 16s
  14. 27m 56s
    1. Installing IIS on Windows XP
      6m 32s
    2. Installing ASP.NET 3.5 on Windows XP
      1m 39s
    3. Deploying a site on Windows XP
      5m 9s
    4. Installing Information Internet Services (IIS) on Windows Vista, Windows 7, and Windows 8
      1m 56s
    5. Configuring ASP.NET 3.5 on Windows Vista
      2m 15s
    6. Deploying an application on Windows Vista
      3m 29s
    7. Scripting a database for deployment
      3m 36s
    8. Exporting database scripts in SQL Server Management Studio 2012 (NEW)
      3m 20s
  15. 2m 0s
    1. Where to go from here
      2m 0s

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