By Alex Homer
ASP.NET is a giant enhance from prior incarnations of ASP, with certainly one of its targets being natural HTML output that achieves greatest cross-browser compatibility. The server-side occasion structure has a tendency to engender this method, yet amid the 1st flush of pleasure its usually forgotten that theres nonetheless a spot for wealthy consumers and dealing with information in a mess of locations. disbursed data-driven functions arent new, however the variety of probabilities and straightforwardness of improvement have either elevated with the creation of .NET.
This ebook techniques facts administration and knowledge purposes from numerous various issues of view:
- Understanding the hot .NET info administration philosophy for either relational and XML information
- Grasping different ideas that it encompasses and the way they relate to real-world necessities
- Exploring the applying structure and layout implications of the .NET information administration sessions
- Designing dispensed data-driven ASP.NET functions that enjoy the new facts administration recommendations
- Examining the rich-client philosophy and the way .NET can be utilized to carry this approximately
- Demonstrating how effortless it truly is to exploit a number of forms of customer units, offering the simplest consumer event attainable for every one
Many books describe the elemental ideas for operating with info in ASP.NET. in spite of the fact that, this e-book is going not only a step additional, yet in reality takes you on an entire trip by way of exploring how one can give you the person with the very best client-side adventure whilst operating with info. It additionally makes a speciality of the server-side layout and improvement procedure, similar to utilizing the n-tier structure on your purposes, and imposing particular recommendations, reminiscent of properly handling updates to an information shop via a number of concurrent clients.
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Additional info for Distributed Data Applications with ASP.NET
Plus, it contains logic to allow some complex operations to be carried out on the stored data. However, it's when you require a disconnected "data storage" object that the DataSet really comes into its own. It's used in conjunction with three ancillary objects that load the data, and it can also update the original data source. These are the Connection and Command objects that you've already encountered, plus the 29 Chapter 1 DataAdapter object, which performs most of the magic. Figure 1-7 shows these objects and how they relate to each other.
A similar situation already exists when you think about news articles-how do you search for a specific set of articles? You might specify a person's or a company's name, a date, or a location. 0" 1>
This method returns a DataReader object that's connected to the resulting rows, and you can use this object to iterate through them or (as you'll see later) present them in other ways. Write("Error while accessing data. NET Framework, the DataReader class gains a new property named HasRows that you can use to check if any rows were returned by the query or stored procedure without having to call the Read method. 26 The Distributed Application Closing the Database Connection Note that it's important to close the connection to the database when the DataReader is no longer required.