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Presenting a dataset in an ASP.NET page

From: ASP.NET Essential Training

Video: Presenting a dataset in an ASP.NET page

After you define a database connection in Visual Web Developer, you can then present data easily in any ASP.NET page. I'll be working with the file Default.aspx, which was created automatically when I created the new website. First, with Default.aspx in Code view, I'll click into the Title element within the head section and I'll put in a title of Author List. Then, within the div tag, I'll add an h1 tag set and within the h1 tag set I'll once again type in Author List. Then I'll look at the page in Design view. Notice that the Author List heading is displayed on the screen. Next, I'm going to press Enter. This results in creating a new paragraph in the page. Now, to actually display the list of authors on the page, all I'll need to do is drag the Authors table from the Database Explorer into the page. Visual Web Developer will take care of everything in the background. I'll go to the Database Explorer. From there I'll open my list of tables, and I'll locate the Authors Table, and I'll click and drag the Authors table, and drop it inside the paragraph.

Presenting a dataset in an ASP.NET page

After you define a database connection in Visual Web Developer, you can then present data easily in any ASP.NET page. I'll be working with the file Default.aspx, which was created automatically when I created the new website. First, with Default.aspx in Code view, I'll click into the Title element within the head section and I'll put in a title of Author List. Then, within the div tag, I'll add an h1 tag set and within the h1 tag set I'll once again type in Author List. Then I'll look at the page in Design view. Notice that the Author List heading is displayed on the screen. Next, I'm going to press Enter. This results in creating a new paragraph in the page. Now, to actually display the list of authors on the page, all I'll need to do is drag the Authors table from the Database Explorer into the page. Visual Web Developer will take care of everything in the background. I'll go to the Database Explorer. From there I'll open my list of tables, and I'll locate the Authors Table, and I'll click and drag the Authors table, and drop it inside the paragraph.

After a moment, I'll see a grid view appear. A grid view is a rendering of an HTML table that dynamically presents the data. I'll describe in detail how to use a grid view in other videos, but for now, I'm just going to save and test the page. I'll save the file, then I'll go to the Menu and select Debug > Start Without Debugging, or press Ctrl+F5. Visual web developer starts up the development web server and runs the page and displays the data automatically. You'll see that all of the columns from the database table are displayed: the primary key, the author's first name and last name, and so on. Now, I'll describe some of the things that happened in the background when I dragged the table into the page. I'll close the browser, and first let's take a look at the code that was generated in Default.aspx. I'll click on Source View, then go to View > Full Screen so I can see as much code as possible. Notice that I created something called a grid view.

The grid view generates the HTML table code that's presented by the browser. A little further down, I'll find a little bit of code that generates something called an SqlDataSource. The SqlDataSource describes how I'm going to retrieve the data from the database server. And most importantly, it uses something called a ConnectionString. A ConnectionString is a definition of the location of the database and a description of how I'm going to connect to it. And you'll see that an automatic ConnectionString called mybookstoreConnectionString1 was generated by Visual Web Developer. This ConnectionString is defined in a file called Web Config. Go to the Solution Explorer and open the web.config file. I press Ctrl+F. That opens up the Find and Replace dialog. Type in "Connection" and click Find Next and then close the Find and Replace dialog. You'll see that a new element called ConnectionStrings has been added. And then within the ConnectionStrings element, there's an add element with a name of mybookstoreconnectionString1. And then the definition of the database and how I'm connecting is right here. It says connectionString=Data source=localhostsqlexpress;Initialcatalog=mybookstore, which is known in SQL Server as the database name. And Integrated Security=True. Integrated Security is what's known in Visual Web Developer as Windows authentication, meaning I don't need to provide my username and password to authenticate and use the database. Once the ConnectionString has been defined once in the web.config file, it can then be used throughout the rest of my website. It doesn't have to be defined new each time, and its also important to note that even though I had previously defined the connection in Visual Web Developer, the connection was only defined for this particular website when I dragged my first bit of data into my first page. Until then, the database connection information was being managed by Visual Web Developer, and it will now be available to all the websites that I use, as long as I'm using this copy of Visual Web Developer and I'm logged in as myself on my copy of Windows.

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This video is part of

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ASP.NET Essential Training

79 video lessons · 49167 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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