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ASP.NET Essential Training

Creating an update page


From:

ASP.NET Essential Training

with David Gassner

Video: Creating an update page

Websites with data entry systems can also use update forms. An Update Form queries the database on the server, filtering the data to retrieve just a single record, presents that data in a form, in this case presented with the DetailsView control, and then when the user has filled in the new data and clicked the appropriate link, the new data is sent back to the server in an update statement. You can also integrate update forms with the rest of the data entry system by linking to the form from a list page. For this demonstration I'll be working with the file AuthorUpdate.aspx. It begins where another video left off using a DetailsView control, which is currently configured for inserting 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 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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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
Subjects:
Developer Web Servers Programming Languages Web Development
Software:
ASP.NET
Author:
David Gassner

Creating an update page

Websites with data entry systems can also use update forms. An Update Form queries the database on the server, filtering the data to retrieve just a single record, presents that data in a form, in this case presented with the DetailsView control, and then when the user has filled in the new data and clicked the appropriate link, the new data is sent back to the server in an update statement. You can also integrate update forms with the rest of the data entry system by linking to the form from a list page. For this demonstration I'll be working with the file AuthorUpdate.aspx. It begins where another video left off using a DetailsView control, which is currently configured for inserting data.

I'll start by clicking on the control and opening its smart tasks list. Now I'll disable Inserting and then instead I'll select the option Enable Editing. Then with the controls still selected I'll press F4 to go to the Properties view. In the Properties view, which I configured as a floating panel, I'll go to the DefaultMode property and change it from Insert to Edit. Notice that the default appearance of the form changes. Now it shows the primary key, but as a read only value only and also displays links at the bottom for updating and canceling the data. The next step is to modify the SqlDataSource component so that it retrieves only one record from the server-side database and filters for that record based on a primary key value.

I'll close the Properties view and then look at the file in Source view. I am going to go down to the declaration of the of the SqlDataSource component. I'll press Alt+Shift+Enter to go into Full Screen mode and then I'll take a look at the code for the Select command. The Select command is the command that retrieves data from the database on the server. The default select command that's created when you drag a table into a page, selects all the data from the table. In this case all of the data is being retrieved from the author's table.

I'll place the cursor at the end of the SQL statement and add a filtering expression Where and then the name of the column au_id wrapped in brackets. And then in equals operator and the name of a parameter starting with the @ character and then au_id. So I have created a filtering clause as part of the select statement. Now I need to tell the SqlDataSource object where to get the value for that parameter. To do that I'll place the cursor after the begin tag and before the existing parameters. In fact, I can delete some of these parameters. The Delete and Insert parameters won't be used in this page at any point. I'll be using the UpdateParameter. So I'll leave those in place. Then above the UpdateParameters, I'll create a new set of parameters called SelectParameters.

I will type in the less than character and then choose select parameters from the list, then put in the closing tag character and you will see Visual Web Developer completes the tag with an end tag. I'll press Enter a couple of times. Next, I need to indicate where the value of that parameter will come from. I'll start with asp: and then I'll select a QueryStringParamter. This means that I'll be getting the value from a parameter passed in as part of the URL of the page. I'll select asp: QueryStringParamter. Then I'll set the name attribute to match the name of the attribute in my SQL statement. Name = "au_id".

Next, I need to tell the command what the name of the QueryStringParamter will be what's passed in with the URL. So I'll add the following property. QueryStringField = au_id. Now the only reason I know that's the name of the parameter is because I'm going to be creating it in the last step of the exercise. And finally, I add the Type attribute, which is used to indicate what the implied data type of the value is. And I'll put in Int32 matching the data type that's used in other parameters for the same column. And then I'll close the tag with slash and the greater than.

So I have modified the select command to include the Where clause, I have used a parameter for the filter value and then I have filled in the parameter from a value passed in with the URL, known here as the QueryStringParamter. I'll save and test the page. When I first run the page, it shows up with no data. That's because when I run the page, the URL does not include the QueryStringParamter that I'm requesting. I'll place the cursor in the web browsers URL field and then at the end of the page, I'll add a question mark and then the QueryParamter au_id and I'll pass in a value of 2, meaning that I want to see the values for author number 2.

And you will see that when the form comes up, it shows the details for that record. I'll click up here again and I'll change it to a value of Author ID number 3 and I'll see another record show up. Now I'll go take a look at Author ID number 1. Marjorie Green and I'm going to change Marjorie Green to Marjorie Brown and click Update. Then I'll go through the author list until I find the record and show that it's been successfully updated. There is one more thing to know about how this page is working. In the pages starting stage it had a code file that already had an event handler function called DetailView_ ItemUpdate. The code for this function checks the affected rows property of the event object for a value of 1 and if it equals 1, it redirects back to the author's page. This matches the kind of code that was used in the Insert operation that I previously demonstrated. And back in the page, if I look at the DetailsView control I'll see that there is an OnItemUpdate at the event handler that's calling that function.

So the structure of the DetailsView control used for updating and the one that's used for inserting are pretty much the same. They are both using the event handlers for the updated or the inserted events depending on which operation is being used and they are both using the ItemCommand event to react to a click on the Cancel button. So that's how you create the form. In the final step, which I'll show in the next video, I'll show you how to get to this Form page from the List page and pass the QueryString property when the user clicks on a link or a button.

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="http://www.microsoft.com/web/downloads/platform.aspx" target="blank">http://www.microsoft.com/web/downloads/platform.aspx</a>
Microsoft Web Platform Installer 2.0 includes everything you need:
ASP.NET 4?
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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