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To create a class, you must define it in a class block: Public Class MyClass ' Class code goes here. End Class You can define as many classes as you need in the same file. However, good coding practices suggest that in most cases you use a single file for each class. Classes exist in many forms. They may represent an actual thing in the real world (as they do in most programming textbooks), they may represent some programming abstraction (such as a rectangle or color structure), or they may just be a convenient way to group related functionality (like with the Math class). Deciding what a class should represent and breaking down your code into a group of interrelated classes are part of the art of object-oriented programming.

Figure 17-6. A simple file uploader Here s the code for the upload page: public partial class UploadFile : System.Web.UI.Page { private string uploadDirectory; protected void Page_Load(object sender, EventArgs e) { // Place files in a website subfolder named Uploads. uploadDirectory = Path.Combine( Request.PhysicalApplicationPath, "Uploads"); } protected void cmdUpload_Click(object sender, EventArgs e) { // Check that a file is actually being submitted. if (Uploader.PostedFile.FileName == "")

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In the next example, you ll see how to construct a NET class piece by piece This class will represent a product from the catalog of an e-commerce company The Product class will store product data, and it will include the built-in functionality needed to generate a block of HTML that displays the product on a web page When this class is complete, you ll be able to put it to work with a sample ASPNET test page Once you ve defined the basic skeleton for your class, the next step is to add some basic data members.

{ lblInfo.Text = "No file specified."; } else { // Check the extension. string extension = Path.GetExtension(Uploader.PostedFile.FileName); switch (extension.ToLower()) { case ".bmp": case ".gif": case ".jpg": break; default: lblInfo.Text = "This file type is not allowed."; return; } // Using this code, the saved file will retain its original // file name when it's placed on the server. string serverFileName = Path.GetFileName( Uploader.PostedFile.FileName); string fullUploadPath = Path.Combine(uploadDirectory, serverFileName); try { Uploader.PostedFile.SaveAs(fullUploadPath); lblInfo.Text = "File " + serverFileName; lblInfo.Text += " uploaded successfully to"; lblInfo.Text += fullUploadPath; } catch (Exception err) { lblInfo.Text = err.Message; } } } }

This example defines three member variables that store information about the product namely, its name, price, and a URL that points to an image file: Public Class Product Private name As String Private price As Decimal Private imageUrl As String End Class A local variable exists only until the current method ends On the other hand, a member variable (or field) is declared as part of a class It s available to all the methods in the class; it s created when the object is created; and it lives as long as the containing object lives When you declare a member variable, you set its accessibility The accessibility determines whether other parts of your code will be able to read and alter this variable For example, if ClassA contains a private variable, the code in ClassB will not be able to read or modify it.

The saved file keeps its original (client-side) name. The code uses the Path.GetFileName() static method to transform the fully qualified name provided by FileUpload.PostedFile.FileName and retrieve just the file, without the path. The FileUpload.PostedFile object contains only a few properties. One interesting property is ContentLength, which returns the size of the file in bytes. You could examine this setting and use it to prevent a user from uploading excessively large files.

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