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Figure 7-6. A query string sender Here s the code for the first page: public partial class QueryStringSender : System.Web.UI.Page { protected void Page_Load(Object sender, EventArgs e) { if (!this.IsPostBack) { // Add sample values. lstItems.Items.Add("Econo Sofa"); lstItems.Items.Add("Supreme Leather Drapery"); lstItems.Items.Add("Threadbare Carpet"); lstItems.Items.Add("Antique Lamp"); lstItems.Items.Add("Retro-Finish Jacuzzi"); } } protected void cmdGo_Click(Object sender, EventArgs e) { if (lstItems.SelectedIndex == -1) { lblError.Text = "You must select an item."; } else { // Forward the user to the information page, // with the query string data. string url = "QueryStringRecipient.aspx ";

url += "Item=" + lstItems.SelectedItem.Text + "&"; url += "Mode=" + chkDetails.Checked.ToString(); Response.Redirect(url); } } } Here s the code for the recipient page (shown in Figure 7-7): public partial class QueryStringRecipient : System.Web.UI.Page { protected void Page_Load(Object sender, EventArgs e) { lblInfo.Text = "Item: " + Request.QueryString["Item"]; lblInfo.Text += "<br />Show Full Record: "; lblInfo.Text += Request.QueryString["Mode"]; } }

class CreateTrainingClasses < ActiveRecord::Migration def self.up create_table :training_classes do |t| t.string :name, :limit=>45 end end def self.down drop_table :training_classes end end

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Figure 7-7. A query string recipient One interesting aspect of this example is that it places information in the query string that isn t valid namely, the space that appears in the item name. When you run the application, you ll notice that ASP.NET encodes the string for you automatically, converting spaces to the valid %20 equivalent escape sequence. The recipient page reads the original values from the QueryString collection without any trouble. This automatic encoding isn t always sufficient. To deal with special characters, you should use the URL-encoding technique described in the next section.

One potential problem with the query string is that some characters aren t allowed in a URL In fact, the list of characters that are allowed in a URL is much shorter than the list of allowed characters in an HTML document All characters must be alphanumeric or one of a small set of special characters (including $-_+!*'(),) Some browsers tolerate certain additional special characters (Internet Explorer is notoriously lax), but many do not Furthermore, some characters have special meaning For example, the ampersand (&) is used to separate multiple query string parameters, the plus sign (+) is an alternate way to represent a space, and the number sign (#) is used to point to a specific bookmark in a web page If you try to send query string values that include any of these characters, you ll lose some of your data.

Listing 12-15. Training Class Model (app/models/training_class.rb)

state from other objects, the only way that objects can collaborate with each other is by sending messages to one another In concept this is all well and good, but sometimes the OOP model begins to break down a bit in large software systems Objects are supposed to interact by sending messages to each other, but how are objects supposed to find the other objects with which they are supposed to collaborate You ve surely seen this problem before, especially if you ve worked on Java EE applications You start by writing classes and objects that model the business domain in which you re working You re feeling good because the classes and objects have high cohesion, meaning they do one thing and do it well.

You can test this out with the previous example by adding items with special characters in the list box To avoid potential problems, it s a good idea to perform URL encoding on text values before you place them in the query string With URL encoding, special characters are replaced by escaped character sequences starting with the percent sign (%), followed by a two-digit hexadecimal representation For example, the & character becomes %26 The only exception is the space character, which can be represented as the character sequence %20 or the + sign To perform URL encoding, you use the UrlEncode() and UrlDecode() methods of the HttpServerUtility class As you learned in 5, an HttpServerUtility object is made available to your code in every web form through the PageServer property.

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