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This code pulls the connection string from the Web.Config file for the web application. If you don t have one already, refer back to 4 for instructions on installing and configuring the database on your web site. It then creates a new instance of a SqlConnection object, initializing it with this connection string. The SQL is simply a string, and in SQL strings you can specify parameters using the @ directive, so it knows that when you say ProductPhotoID=@ID, it will be expecting a parameter. Next, a new SqlCommand is created using this SQL code on the configured connection. Finally, the parameter is added to the command. SQLCommand objects have a collection of parameters that is empty by default. When you add parameters to this collection, you specify the parameter name (@ID in this case) and the parameter value (picID in this case). When the command is executed, the SQL is assembled with the parameter values filling in the placeholders. The next step is to open the database and execute the SQL. When you execute a command, a SqlDataReader object is returned, allowing you to read the results line by line. This query will at most return one line (as there is only one picture per ProductPhotoId).

getLocale() getOutputStream() getWriter() isCommitted() reset()

Searching for and locating certain elements within an XML document is a fairly common task. XPath is an expression language that allows you to navigate through elements and attributes in an XML document. XPath consists of various XPath expressions and functions that you can use to look for and select elements and attributes matching certain patterns. XPath is also a W3C recommendation. Figure 1-6 shows an example of how XPath works.

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con.Open(); SqlDataReader sqlRead = cmd.ExecuteReader();

Microsoft s .NET Framework is a platform for building Windows- and web-based applications, components, and services by using a variety of programming languages. Figure 1-7 shows the stack of the .NET Framework.

setDateHeader() setHeader() sendError() sendRedirect() setBufferSize() setContentLength() setContentType() setIntHeader() 130

To access the contents of the SqlDataReader, the Read function is called. This reads a single record at a time. As we have at most one record, we call this once. Calling this function loads the next record, and returns true if it succeeds (i.e., if there is a next record), and false if it doesn t. Thus, in this case, we can gate the sqlRead.Read, and in the true clause handle the loading and writing of the image to the response. In the false clause, we can provide an error message. Here s the code:

Table 5-2. The Methods on the HttpServletResponse Object (continued)

Figure 1-7. Stack of the .NET Framework At the bottom level, you have the operating system. As far as commercial application development using the .NET Framework is concerned, your operating system will be one of the various flavors of Windows (including Windows 2000, Windows 2003, Windows XP, and Windows Vista). On top of the operating system, you have the common language runtime (CLR) layer. The CLR is the heart of the .NET Framework. It provides the executing environment to all the .NET applications, so in order to run any .NET applications, you must have the CLR installed. The CLR does many things for your application, including memory management, thread management, and security checking.

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if (sqlRead.Read()) { MemoryStream mems = new MemoryStream(); BinaryWriter binw = new BinaryWriter(mems); byte[] bits = (byte[])sqlRead["LargePhoto"]; binw.Write(bits); Bitmap b = new Bitmap(mems); sqlRead.Close(); con.Close(); Response.ContentType = "image/jpeg"; //Response.Write(b); b.Save(Response.OutputStream, ImageFormat.Jpeg); } else { Response.Write("No image found"); }

On top of the CLR, a huge collection of classes called the Base Class Library gets installed. The Base Class Library provides classes to perform almost everything that you need in your application. It includes classes for file input/output (IO), database access, XML manipulation, web programming, socket programming, and many more things. If you are developing a useful application in .NET, chances are that you will use one or another of the classes in the Base Class Library, and hence, your applications are shown sitting on top of it. These applications can be developed using a variety of programming languages. Out of the box, the .NET Framework provides five programming languages: Visual Basic .NET, Visual C#, Managed C++, JScript .NET, and Visual J#. There are many other third-party compilers that you can use to develop .NET applications. As a matter of fact, you can develop any .NET application by using Notepad and commandline compilers. However, most of the real-world applications call for a short development time, so that is where an integrated development environment (IDE) such as Visual Studio 2008 can be very helpful. It makes you much more productive than the Notepad approach. Features such as drag and drop, powerful debugging, and IntelliSense make application development much simpler and faster.