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Registering a user control on a web form page

From: ASP.NET Essential Training

Video: Registering a user control on a web form page

Once you have created a user control, you can then use it in many pages. There are two basic approaches that you can select from. In one, you explicitly register the control in each page in which you want to use it. And then using an ASP.NET tag, you display the control. The other approach is to register the control globally for the whole website. Here, I'm going to demonstrate how to register the file locally. As I have shown in another video, you can actually drag and drop a control into a page in Design View, and all of the required code will be generated for you, but it's useful to know how to hand code it where necessary.

Registering a user control on a web form page

Once you have created a user control, you can then use it in many pages. There are two basic approaches that you can select from. In one, you explicitly register the control in each page in which you want to use it. And then using an ASP.NET tag, you display the control. The other approach is to register the control globally for the whole website. Here, I'm going to demonstrate how to register the file locally. As I have shown in another video, you can actually drag and drop a control into a page in Design View, and all of the required code will be generated for you, but it's useful to know how to hand code it where necessary.

I am working with the file Authors.aspx, which has the same sort of markup as the Default.aspx file I used previously. I'm going to place the cursor after the page declaration, but before the html DOCTYPE declaration, and I'll make a little bit of extra space. I'll start with a less than character and a percent character, and you'll see a list of available declarations appear. I'll go down to the Register declaration, and I'll select it and then press the spacebar. You can register a control either from the source file which is what we're working with here, or if you are working with pre-compiled code, you can register a control from an Assembly and Name space.

I am going to use the Source attribute, because I'm referring to the control by its source file name. I'll select source, Src. I'll put in the equal sign and a quote, and then I'll double-click to select Pick URL. Then I'll navigate to the Controls folder and I'll choose my file Header.ascx and click OK. Notice that Visual Web Developer sets the source using a tilde before /controls. The expression tilde slash refers to the root of the website.

Next, I declare a TagName and a TagPrefix. These can be anything I like. I'll press the spacebar and then select TagName, put in the equals and a quote, and I'll set the TagName as Header. Then I'll press the spacebar again and select TagPrefix, type in the equals and a quote, and I'll set the Prefix as uc1 for user control folder 1. Notice that after a moment, all of the little squigglies that indicate errors have gone away. This is a visual indicator that says I have coded this correctly.

Now, I'll go down further in the page and I'm going to select the tags that present the image and the menu. And I'll delete them by pressing the Delete key. Then I'll tab in so that I'm aligning the cursor with the existing code. I'll type in a less than character and type UC and you'll see that uc1:Header is displayed by Visual Web Developer as a possible option. I'll select the item, and I'll also add runat = server. That part is critical. If you don't put in the runat="server" attribute, then when you run the page, your header won't appear because it won't have been processed at the server level.

I'll save my changes and test the page. Selecting Debug > Start Without Debugging. When the page appears, it once again displays the image and the hyperlinks. I can click to go to the homepage and back to the Author's page, and in both cases, I'm using exactly the same user control, but the details of the page below the control are different.

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This video is part of

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ASP.NET Essential Training

79 video lessons · 49247 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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