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The ViewState property of the page provides the current view state information. This property is an instance of the StateBag collection class. The StateBag is a dictionary collection, which means every item is stored in a separate slot using a unique string name. For example, consider this code: // The this keyword refers to the current Page object. It's optional. this.ViewState["Counter"] = 1; This places the value 1 (or rather, an integer that contains the value 1) into the ViewState collection and gives it the descriptive name Counter. If currently no item has the name Counter, a new item will be added automatically. If an item is already stored under the name Counter, it will be replaced. When retrieving a value, you use the key name. You also need to cast the retrieved value to the appropriate data type using the casting syntax you saw in 2 and 3. This extra step is required because the ViewState collection stores all items as basic objects, which allows it to handle many different data types. Here s the code that retrieves the counter from view state and converts it to an integer: int counter; counter = (int)this.ViewState["Counter"];

s Note ASP.NET provides many collections that use the same dictionary syntax. This includes the collections you ll use for session and application state, as well as those used for caching and cookies. You ll see several of these collections in this chapter.

Save this as app/views/layout/application.html.erb. Note that the layout includes a link to training.css, so you ll need to create that next, as shown in Listing 12-9.

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The following example is a simple counter program that records how many times a button is clicked. Without any kind of state management, the counter will be locked perpetually at 1. With careful use of view state, the counter works as expected. public partial class SimpleCounter : System.Web.UI.Page { protected void cmdIncrement_Click(Object sender, EventArgs e) { int counter; if (ViewState["Counter"] == null) { counter = 1; } else { counter = (int)ViewState["Counter"] + 1; } ViewState["Counter"] = counter; lblCount.Text = "Counter: " + counter.ToString(); } } The code checks to make sure the item exists in view state before it attempts to retrieve it. Otherwise, you could easily run into problems such as the infamous null reference exception (which is described in 8). Figure 7-1 shows the output for this page.

<input jwcid="podcast@tacos:AjaxSubmit" value="Add Podcast" action="listener:addPodcast" updateComponents="ognl:{'podcasts'}" effects="template:{highlight:{any:'[255,255,184], 500, 500'}}" /> </form> <div jwcid="@Any" id="podcasts"> <span jwcid="@If" condition="ognl:podcast.name"> <table> <tbody> <tr> <th align="left">Podcast Name:</th> <th align="left">Short Desc:</th> <th align="left">Long Desc:</th> <th align="left">Release Date:</th> <th align="left">Podcast Length:</th> <th align="left">Played </th> </tr> <tr> <td> <span jwcid="@Insert" value="ognl:podcast.name" /> </td> <td> <span jwcid="@Insert" value="ognl:podcast.shortDescription" /> </td> <td> <span jwcid="@Insert" value="ognl:podcast.longDescription" /> </td> <td> <span jwcid="@Insert" value="ognl:podcast.releaseDate" /> </td> <td> <span jwcid="@Insert" value="ognl:podcast.length" /> </td> <td> <span jwcid="@Insert" value="ognl:podcast.played 'Yes' : 'No'" /> </td> </tr>

You probably remember from 5 that view state information is stored in a single jumbled string that looks like this: <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="dDw3NDg2NTI5MDg7Oz4=" /> As you add more information to view state, this value can become much longer. Because this value isn t formatted as clear text, many ASP.NET programmers assume that their view state data is encrypted. It isn t. Instead, the view state information is simply patched together in memory and converted to a Base64 string (which is a special type of string that s always acceptable in an HTML document because it doesn t include any extended characters). A clever hacker could reverse-engineer this string and examine your view state data in a matter of seconds.

Listing 12-9. Application Stylesheet (public/stylesheet/training.css)

If you want to make view state more secure, you have two choices First, you can make sure the view state information is tamperproof by instructing ASP NET to use a hash code A hash code is sometimes described as a cryptographically strong checksum The idea is that ASP NET examines all the data in view state, just before it renders the final page It runs this data through a hashing algorithm (with the help of a secret key value) The hashing algorithm creates a short segment of data, which is the hash code This code is then added at the end of the view state data, in the final HTML that s sent to the browser When the page is posted back, ASP NET examines the view state data and recalculates the hash code using the same process.

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