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aspx page links to the source code file using the CodeFile attribute, as shown here: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestFormCodeBehindaspxcs" Inherits="TestFormCodeBehind"%> Notice that Visual Studio uses a slightly unusual naming syntax for the source code file It has the full name of the corresponding web page, complete with the aspx extension, followed by the cs extension at the end This is just a matter of convention, and it avoids a problem if you happen to create two different code-behind file types (for example, a web page and a web service) with the same name..

ADO.NET uses a multilayered architecture that revolves around a few key concepts, such as Connection, Command, and DataSet objects. However, the ADO.NET architecture is quite a bit different from classic ADO. One of the key differences between ADO and ADO.NET is how they deal with the challenge of different data sources. In ADO, programmers always use a generic set of objects, no matter what the underlying data source is. For example, if you want to retrieve a record from an Oracle database, you use the same Connection class you would use to tackle the same task with SQL Server. This isn t the case in ADO.NET, which introduces a new data provider model.

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This time, you use the GetFileName() method to extract just the final filename portion of the string, as shown here: fileName = PathGetFileName(fileName); FileInfo file = new FileInfo(ServerMapPath( PathCombine("Documents", txtBoxText)); This ensures that the user is constrained to the correct directory If you are dealing with URLs, you can work similar magic with the SystemUri type For example, here s how you might remove query string arguments from a URI and make sure it refers to a given server and virtual directory: string uriString = "http://wwwwrongsitecom/pageaspx cmd=run"; Uri uri = new Uri(uriString); string page = SystemIOPathGetFileName(uriAbsolutePath); // page is now just "pageaspx" Uri baseUri = new Uri("http://wwwrightsitecom"); uri = new Uri(baseUri, page); // uri now stores the path http://wwwrightsitecom/pageaspx Table 13-9 lists the methods of the Path class..

You can use one more technique to store data in a file serialization. Serialization is a higher-level model that s built on .NET streams. Essentially, serialization allows you to convert an entire live object into a series of bytes and write those bytes into a stream object such as the FileStream. You can then read those bytes back later to re-create the original object. For serialization to work, your object must all meet the following criteria: The object must have a Serializable attribute preceding the class declaration. All the public and private variables of the class must be serializable. If the class derives from another class, all parent classes must also be serializable. Here s a serializable class that you could use to store log information: [Serializable()] public class LogEntry { private string message; private DateTime date; public string Message { get {return message;} set {message = value;} } public string DateTime { get {return date;} set {date = value;} } public LogEntry(string message) {

A data provider is a set of ADO.NET classes that allows you to access a specific database, execute SQL commands, and retrieve data. Essentially, a data provider is a bridge between your application and a data source.

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this.message = message; this.date = DateTime.Now; } }

The classes that make up a data provider include the following: Connection: You use this object to establish a connection to a data source. Command: You use this object to execute SQL commands and stored procedures. DataReader: This object provides fast read-only, forward-only access to the data retrieved from a query. DataAdapter: This object performs two tasks. First, you can use it to fill a DataSet (a disconnected collection of tables and relationships) with information extracted from a data source. Second, you can use it to apply changes to a data source, according to the modifications you ve made in a DataSet. ADO.NET doesn t include generic data provider objects. Instead, it includes different data providers specifically designed for different types of data sources. Each data provider has a specific implementation of the Connection, Command, DataReader, and DataAdapter classes that s optimized for a specific RBDMS (relational database management system). For example, if you need to create a connection to a SQL Server database, you ll use a connection class named SqlConnection.

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