Exercises in Visual Studio .NET

Creation QR Code 2d barcode in Visual Studio .NET Exercises

Exercises
QR-Code Printer In Visual Studio .NET
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Matrix Maker In .NET
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Exercise 3-1. We ll start things off simply. Suppose you have a store that ships only to certain states in the Northeastern United States. In your order form, you want to restrict users to only those states as their shipping destination, so you want to use a drop-down list. You also want to save space on your form, though, so you want to hide that delivery list in a Panel with a PopupControlExtender. For this exercise, you ll only produce the part of the form where users would enter the shipping State. The finished form should look like Figure 3-16. The drop-down list should contain just the six states shown in Figure 3-16. When the user chooses one of the states, the state s two-letter postal abbreviation should appear in the text box. Exercise 3-2. Most of the AJAX control extenders that we ve shown you in this chapter just do one thing, although they do it very well. There are, however, many more extenders that we haven t shown you, and more are being added all the time. Each one is different, and covering them all in detail would require more space than we have or would be out of date almost immediately. The best way to learn about the AJAX control extenders is to go to the ASP.NET AJAX Control Toolkit page at http:// ajax.asp.net/ajaxtoolkit/. There you ll find the latest extenders with examples of how to use them. Many of the extenders are fairly simple, and have properties you can set easily. In this exercise, you ll need to use that documentation as you try out a new extender.
Generate Linear Barcode In .NET
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Creating DataMatrix In Visual Studio .NET
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Exercises
Barcode Maker In .NET
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Drawing UPC A In VS .NET
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Code 39 Extended Printer In .NET Framework
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Encode EAN / UCC - 8 In VS .NET
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For this exercise, you ll use the RoundedCorners extender. Create a new page that includes a Panel with the dimensions 150 pixels by 100 pixels, colored light gray. The Panel should contain a Label, 50 pixels wide, colored dark gray, with text that s white and bold (feel free to use livelier colors; we re choosing ones here that will show up in the book). The Panel should have only its top corners rounded to a radius of 8. The Label should have all its corners rounded to a radius of 2. You ll need the documentation to tell you how to do all that. The result should look like Figure 3-17. Exercise 3-3. The SliderExtender is another interesting extender, but slightly more complicated than it looks. Create a new page that uses the slider extender to simulate a volume control. The slider should be set horizontally, and should have a range from 0 to 10. The results should look like Figure 3-18. (Hint: The documentation is somewhat unclear. You ll need two textboxes the slider prevents one from displaying, so you need to use a second textbox, called a bound control, to see the value the slider is set to.)
Drawing QR Code 2d Barcode In None
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Encoding QR Code 2d Barcode In Visual C#.NET
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EAN / UCC - 13 Encoder In Java
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Barcode Maker In Visual Studio .NET
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3: Snappier Web Sites with AJAX
Printing GS1 DataBar Limited In Java
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Reading QR In VS .NET
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Exercises
Create QR-Code In None
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Printing Barcode In None
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Encode Code-128 In VB.NET
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Printing EAN 13 In None
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4 4 CHAPTER
Barcode Printer In None
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Printing Code 3 Of 9 In Java
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Saving and Retrieving Data
So far, you ve seen how to make good-looking web pages with clever and useful controls. You know how to change the appearance of the page in response to user selections, and how to use AJAX to enhance the performance of your application. But the applications you ve made so far have been limited in what they can actually do. In this chapter we add the most frequently sought after functionality: the ability to retrieve, change and store data. Think about the web sites you visit most often, and you ll find that almost all of them have one thing in common they interact with persistent data. Persistent data is data that survives a single session; data that you expect will be there the next time you visit. In fact, it may even be data that can have significant financial consequences. Shopping sites have databases to track their inventories and customer transactions. News sites keep databases with articles and photos in them, perhaps referenced by topic and date. Search engines use unimaginably large (and wicked-fast) databases. Nearly every real-world commercial web application must be able to perform the four essential CRUD interactions with a database: Create, Read, Update, and Delete. Fortunately, ASP.NET provides controls that make it easy and fast to perform these essential activities. We will demonstrate these interactions with SQL Server Express (or its big brother, SQL Server) but they work equally well or nearly so with Microsoft Access and most commercial databases. In theory, you can interact with virtually any collection of data or with XML files, but that is an advanced topic we won t go into here. Along the way we ll show you enough about database interactions that even if you ve never used a relational database, such as SQL Express, you ll have little trouble working with one through your web application.
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