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Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "Confirm", script); form1.Attributes.Add("onSubmit", "return confirmSubmit();"); }

To make it easier to define a JavaScript function over multiple lines, you can precede the string with the @ symbol. That way, all the characters are treated as string literals, and you can span multiple lines.

2. 3.

Figure 29-5. Using a JavaScript confirmation message Later in this example, you ll see a control that uses the RegisterStartupScript() to show a pop-up window.

In previous versions of ASP.NET, developers often used startup scripts to set the control that should get the focus when the page first displays. However, ASP.NET 2.0 encapsulates this functionality with the Control.Focus() method, so you don t have to code your own solution any longer.

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Often, developers aren t aware of the security vulnerabilities they introduce in a page. That s because many common dangers including script injection and SQL injection are surprisingly easy to stumble into. To minimize these risks, technology vendors such as Microsoft strive to find ways to integrate safety checks into the programming framework itself, thereby insulating application programmers. One attack to which web pages are commonly vulnerable is a script injection attack. A script injection attack occurs when malicious tags or script code are submitted by a user (usually through a simple control such as a TextBox control) and then rendered into an HTML page later. Although this rendering process is intended to display the user-supplied data, it actually executes the script. A script injection attack can have any of a number of different effects from trivial to significant. If the user-supplied data is stored in a database and inserted later into pages used by other people, the attack may affect the operation of the website for all users.

to include whatever new or modified features the ticket provides, and attach it to the ticket. If it s being included as part of a new code patch as well, the two can be combined into a single patch, along with tests, if necessary. As you re writing documentation, be sure to read through what already exists to get a feel for the general style of writing that s expected. Of course, the core developers are always the final authority on what makes it into trunk, though, so any necessary changes in style or structure can be made at that point. The closer you get to the appropriate style, the easier it will be to get the patch ready for check-in to the repository.

The basic technique for a script injection attack is for the client to submit content with embedded scripting tags. These scripting tags can include <script>, <object>, <applet>, and <embed>. Although the application can specifically check for these tags and use HTML encoding to replace the tags with harmless HTML entities, that basic validation often isn t performed.

Script injection attacks are a concern of all web developers, whether they are using ASP .NET, ASP or , other web development technologies. ASP .NET includes a feature designed to automatically combat script injection attacks, called request validation. Request validation checks the posted form input and raises an error if any potentially malicious tags (such as <script>) are found. In fact, request validation disallows any nonnumeric tags, including HTML tags (such as <b> and <img>), and tags that don t correspond to anything (such as <abcd>). To test the script validation features, you can create a simple web page like the one shown in Figure 29-6. This simple example contains a text box and a button.

Figure 29-6. Testing a script injection attack Now, try to enter a block of content with a script tag and then click the button. ASP.NET will detect the potentially dangerous value and generate an error. If you re running the code locally, you ll see the rich error page with detailed information, as shown in Figure 29-7. (If you re requesting the page remotely, you ll see only a generic error page.)

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