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Registering controls globally in the web.config file

From: ASP.NET Essential Training

Video: Registering controls globally in the web.config file

For controls that you are going to use in many pages throughout your website, it's useful to be able to register the control globally, so that you don't have to use the register declaration at the top of every page. In order to follow along with this demonstration, you must have already created a file called header.ascx in the Controls folder under the Website Root. Open the file web.config from your Website Root folder. This is the file that configures your entire website. It has a Pages element, which I have already scrolled to at about line 67. Within the Pages element, there is a Controls element and then for each custom control that you want to use in your website globally, you put in an Add element as a child of controls.

Registering controls globally in the web.config file

For controls that you are going to use in many pages throughout your website, it's useful to be able to register the control globally, so that you don't have to use the register declaration at the top of every page. In order to follow along with this demonstration, you must have already created a file called header.ascx in the Controls folder under the Website Root. Open the file web.config from your Website Root folder. This is the file that configures your entire website. It has a Pages element, which I have already scrolled to at about line 67. Within the Pages element, there is a Controls element and then for each custom control that you want to use in your website globally, you put in an Add element as a child of controls.

I am going to move the cursor right before the End tag of Controls, press Enter, move up a line, and then tab in, and then I'll place the New Add tag right below the existing ones. I'll type in a less than character and select add and then I'll tagPrefix. The tagPrefix can be anything you like. I'm going to use a tagPrefix of simply customControls. Then set the tagName. The tagName can be anything you like as well. I'm going to use Header to match the name of the file in which it's defined. Then finally, just as with the register declaration that you used in the local pages, I'll use a source attribute, src, to indicate that I'm getting the file from the Controls folder under the Root. I'll start with the tilde character which you will find right next to the number 1 pressing the Shift key, then a slash, then Controls and then the name of the file Header.ascx.

So there is all my code. Let's review it. I have the Add element which I'll align with the other Add elements just by pressing the Backspace key a couple of times, the tagPrefix, the tagName, and the source. I'll clean up the code a little bit just removing the spaces around the equals operators. They wouldn't hurt anything, but I'd like the code to look a certain way, and then I'll press Ctrl+S to save my changes. Now I'll go to a page, publishers.aspx, which still has the original Header content. I have already selected the text starting with the div tag wrapped around the image and the panel wrapped around the menu, and I'll delete it.

Then I'll tab in, I'll type in a less than character and start typing cus. And you will see that Visual Web Developer already knows that the Header control is available. I will press Enter to select it. I'll press the spacebar, start typing runat, press Enter, quote and then put in server. As with all custom controls, the runat="server" attribute is critical. I'll close the tag with the slash and a greater than. I'll save my changes and run the page without debugging. And there is the result. The publisher page now uses the user control.

Because I have now registered the control globally, in order to implement this control on all the pages, all I need to do is to select that code, copy it to the clipboard, and then I'll be able to open other pages. For example, I'll go to the Authors page, I'll remove the register declaration from the top, I'll remove the call to the header that uses the special prefix that was created in this page only. I'll place the cursor and then once again start typing custom controls. I'll make sure to add runat="server" and then I'll close the tag. I'll run the page once again without debugging, and you will see once again that user control is working correctly.

So once you have created the control and registered it globally in web.config, you can then use it as many times in as many pages as you like.

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This video is part of

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ASP.NET Essential Training

79 video lessons · 48101 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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