ASP.NET Essential Training
Illustration by Richard Downs

Redirecting page requests


ASP.NET Essential Training

with David Gassner

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Video: Redirecting page requests

In other videos in this chapter, I have described how to use the DetailsView control to present a data entry form and then how to insert data into a server-side database from data passed into the control by the user. Now, I'm going to describe how to bind together a list page, such as the Authors.aspx page I'm showing on the screen, with the Insert Form so that the user can link from the list page to the form and then return to the list page when they finish their task. I will start in Authors.aspx. This file currently shows a list of existing data.
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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 42s
    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 31s
  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 48s
    1. Creating a query with joined tables
      8m 6s
    2. Replacing control style properties with CSS
      5m 49s
    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 12s
    1. Understanding ViewState and managing postbacks
      4m 35s
    2. Using session variables
      6m 37s
  13. 20m 56s
    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 26s
    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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Watch the Online Video Course ASP.NET Essential Training
6h 24m Beginner Apr 28, 2009 Updated Feb 13, 2013

Viewers: in countries Watching now:

Thousands of businesses have used Microsoft ASP.NET to build professional, dynamic websites. In this course, web developer David Gassner demonstrates the tools needed to build and deploy a dynamic site using ASP.NET 3.5 or 4.5. Covering everything from installing and configuring Visual Web Developer 2008 or Visual Studio Express 2012 for Web and SQL Server Express to creating web form pages, this course is designed to give beginning and intermediate developers hands-on experience.

Topics include:
  • Storing data with SQL Server
  • Using the GridView control to present and edit dynamic data
  • Creating a data entry system
  • Attaching external CSS files
  • Creating pages to log in and authenticate visitors
  • Installing Internet Information Services (IIS) on Windows XP and Windows Vista
  • Deploying an ASP.NET website on IIS
Developer Web
David Gassner

Redirecting page requests

In other videos in this chapter, I have described how to use the DetailsView control to present a data entry form and then how to insert data into a server-side database from data passed into the control by the user. Now, I'm going to describe how to bind together a list page, such as the Authors.aspx page I'm showing on the screen, with the Insert Form so that the user can link from the list page to the form and then return to the list page when they finish their task. I will start in Authors.aspx. This file currently shows a list of existing data.

I'm going to create a simple hyperlink that takes the user to the AuthorInsert page. I'll click right after the table, clicking to the right of the control and then I'll press Enter to create a new paragraph and I'll press Enter one more time to push the SQLDataSource down a line and then click above the SQLDataSource into the now empty paragraph. Now I'll go to the Toolbar panel. I'll move the cursor over the tab and then I'll pin the Toolbox and then I'll locate the Hyperlink control, which will be found in the standard category of the Toolbox. Then I'll click and drag the hyperlink and drop it into the paragraph. An ASP hyperlink simply generates an anchor tag and you set its values, that is the text or image it displays and the URL to which the user will navigate, through the control's properties.

With that selected, I'll go to the Properties panel, I'll double-click on the Properties panel header to make it float and then I'll drag it out, so I can see the properties more easily. Notice that the default text is Hyperlink. I'll change that to Add New Author and when I press Enter or Tab, I'll see that new text reflected in the Design view. Now I'll indicate which page I want the user to navigate to. I'll go to the NavigateURL property and I'll click into the text input next to the name.

Notice I then see a triple dot button, which allows me to browse for a target page. I'll click the button and I'll select the file, AuthorInsert.aspx. Then I'll click OK. Notice that Visual Web Developer uses the syntax starting with the tilde character which stands for the Root folder of the website, then the slash and then the name of the page. So now, I'll test my hyperlink. I'll press Control+S to save the file and Control+F5 to run it in the browser. When the Authors page appears, it shows the new link. I'll move the cursor over the link and click and I'm taken to the Insert page. Now I'll describe how to handle navigating from the insert form back to the list page. I'll close the browser and then switch to the file AuthorInsert.aspx. This is the same AuthorInsert.aspx that I used in another video of this chapter.

If you didn't work through the previous video that described how to create the insert form, you'll want to do that first before going through these next steps. The insert form in its current state uses a DetailsView to present text input controls for each column. The user types values into the column and then clicks the Insert link. By default, the page simply reloads. I'm going to handle an event that occurs after the data has been inserted into the database and I'll react to that event by redirecting the browser back to the list of data.

This page was originally created with a code file. The name of the code file is AuthorInsert.aspx.cs. I'll go to that file and I'll add a new function. I'm doing this work in C#. If you are doing your own work in Visual Basic, you will need to translate this code into the appropriate syntax but the basic architecture is the same. I will create a function with a protected access modifier and then a return type of void. I'll name the function DetailView_ItemInsert. I'm going to press Alt+Shift+Enter to open to Full Screen so I can see as much code as possible and then I'll scroll back over so I can see the beginning of the function. Now, I'll complete the function signature. I'll put it in an opening parenthesis and then the first item that will be passed in will be an object, which I'll name sender.

In an event handler function like this, the sender argument is a reference to the object that actually generated the event like the DetailView. Then I'll pass in something known as an event object. The event object contains information about the event that just occurred and in this particular event that I'll be working with, which is the item inserted event, the data type of the event object is DetailsViewInsertedEventArgs. So I'll put in the data type, DetailsViewInsertedEventArgs, and then I'll set the name of the event object as simply e for event.

Now put in the pair of braces. When this event occurs, the event object will have a property called affected rows. It's a numeric property and if the insert statement succeeded, it will have a value of 1. So I'll ask the question, if e.Affectedrows == 1. This means if one row is affected in the database, and then I'm going to take that as a condition of success. I'll put in a pair of braces and within the braces, I'll respond to that condition by calling this code, Response.Redirect, and I'll pass in the location of the file I want the user to go to, Authors.aspx.

Notice that I'm ending the statement with the semicolon because I'm working in C#. Now to make this function happen, I'm going to select and then copy just the name of the function to the clipboard. Then I'll go back to the page AuthorInsert.aspx and I'll look at this file in Source View. I'll scroll up to the DetailsView control's begin tag and place the cursor right inside the closing angle bracket. I will press Enter and then I'll put in an event handler attribute, which looks like this, OnItemInserted. This is the name of the attribute which causes the function to be called when this event occurs. I'll put in the equals and the quote and then I'll press Ctrl+V to paste in the name of the function and then close the statement with the closing quote.

Notice that I don't have to put in the parenthesis or actually call the function. The DetailsView object will call the function for me and it will call it using the signature or the number and data types of the arguments that I defined. I'll save all my changes by selecting File > Save All. Then I'll test the page. I'll select Debug > Start Without Debugging and I'm going to type in some values. When I click the Insert link, the data is inserted into the database and as you can see on the screen, the new data has been successfully added. Now I'll also put in code to handle the event that occurs when the user clicks the Cancel link.

I'll return back to the file AuthorInsert.aspx.cs and I'll move the cursor down below the existing functions and press Enter. When the user clicks either of the links, another event called ItemCommand occurs. As before, I'll create a new function starting with protected void and I'll name this function DetailView_ ItemCommand. As before the first argument will be an object which I'll name Sender and the event object passed in, it's the second argument, this time will have a data type of DetailsViewCommandEventArgs. I'll select the appropriate type and give it a name of e.

Then put in a pair of braces. Within the braces, I'm going to ask which link was clicked and specifically I'll check whether the user clicked the Cancel link using this syntax. if e.CommandName == "Cancel". Then I'll put in a pair of braces and within the conditional clause, I'll once again use the same redirect command. I'll just copy and paste it from the previous function. I'll select the code, Response. RedirectAuthors.aspx, press Ctrl+C to copy, click into my new conditional clause and press Ctrl+V to paste.

Now as before, I'll select and copy the name of the function that I just created. I'll save the changes to this file by pressing Ctrl+S. I'll return back to AuthorInsert.aspx and I'll add another event handler attribute. This one will be OnItemCommand. I'll start off by typing On, then press Ctrl+Space to bring up a list of events and the I'll keep on typing until I find the event I'm looking for, OnItemCommand. Then I'll put in the equals character that auto completes the name of the attribute, put in the quote, press Ctrl+V to paste and put in the closing quote.

Once again, I'm simply naming the function that I want to be called when the event occurs. I'll save my changes, I'll return back to the list page and test the whole thing. I'll run the list page, Authors.aspx, I'll click Add New Author and this time I'll click the Cancel link and that takes me back to the author list. So now I have a complete system for adding new data. The user clicks the Add New Author link from the list; that takes them to the form. If they type values into the form and click Insert, that adds the data to the server-side database and returns to the list, or if they click the Cancel link, they return to the list without inserting the data into the server-side database.

Find answers to the most frequently asked questions about ASP.NET Essential Training .

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Q: When trying to create a new database, after pasting the text into the SQL Management Suite and executing the query, the database is not created and the following message appears: 

Database 'mybookstore' does not exist. Make sure that the name is entered correctly

What is causing this error?
A: The database must be explicitly created before the script is run. Start by right-clicking on the Databases item in the left panel, then follow the prompts to create the database. Then retry the query.
Q: I am running into problems installing the latest version of ASP.NET. Has the installation procedure changed since this tutorial was recorded?
A: The installation process for the newest version of ASP.NET and its associated tools is a little different than in ASP.NET 3.5, which was used to record this course. You can download Microsoft Web Platform Installer 2.0 from:
<a href="" target="blank"></a>
Microsoft Web Platform Installer 2.0 includes everything you need:
Visual Web Developer 2010?
SQL Server Express
You must have one of the following operating systems:
Windows 7?
Windows Vista?
Windows Vista SP1?
Windows XP SP2+?
Windows Server 2003 SP1+?
Windows Server 2008?
Windows Server 2008 R2
You must have administrator privileges on your computer to run the Web Platform Installer.
Q: This course was updated on 2/13/2013. What changed?
A: Since this course was recorded, Microsoft has released both ASP.NET 4.5, the latest version of the server-side web application server, and Visual Studio Express 2012 for Web (the successor product to Visual Web Developer). Both have been adapted to work on Windows 8. There will be some visual changes and some functional changes, but most of the server-side code shown in the course is the same. This update provides a map for those working with the latest software so they can navigate their way through the course.

In particular, we added <em>What's new</em> movies for both ASP.NET 4 and 4.5, a movie explaining the significance of the update, a movie on installing SQL Server Express 2012, and one on exporting database scripts in SQL Server Management Studio 2012, as well as updates to visuals throughout the course.
Q: In the chapter on user authentication, an authentication error results when I try to use the Login component or register a new user. How do I fix this?
A: This is a known error that can occur when using the original release of Visual Studio 2012 Express for Web. Update your copy of Visual Studio for Web to at least maintenance release 1, and then try the exercise again.
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