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converts any special characters (e.g., <) to harmless HTML entities (e.g., <) that the browser knows to treat as plain text. For example, the code I just gave for Visual Studio 2008/.NET 3.5 displayed the ViewData["greeting"] value as follows. (I know there s no risk of malicious data so far in this example, but there will be soon, and the principle holds anyway.)

The tricky bit is remembering to write Html.Encode() all the time, especially considering that sometimes you must not encode certain values because they may contain HTML that you do want (e.g., from HTML helper methods like Html.ActionLink(), which already take care of encoding any parameter values for you), and you can t HTML-encode a single value twice. If you forget to use Html.Encode() on a usersupplied value, you put your entire application at risk of cross-site scripting (XSS) attacks, as detailed in 15. To solve this difficulty, in .NET 4 Microsoft enhanced the ASP.NET page compiler (which ASP.NET MVC uses by default for its views) to support a new syntax, <%: ... %>, intended to replace <%= ... %>. The difference is that <%: ... %> automatically HTML-encodes its output, blocking the XSS risk, except when the value being rendered comes from a HTML helper, in which case it knows not to reencode the value because it s already safe. This is a huge simplification for developers: now, all you have to do is always use <%: ... %>, and preferably have some kind of hypnosis or brain surgery to erase all memory of the older, dangerous <%= ... %> syntax.

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Figure 1-5. Environment variables for development You ll build on these folders and variables throughout the book to enhance your common development environment.

This is very important for readers using Visual Studio 2008 or targeting .NET 3.5. Throughout this book, I use the new <%: ... %> syntax in all examples. You can t use this syntax in Visual Studio 2008 or if you re targeting .NET 3.5, so you must manually adapt all the code samples using the following two rules: 1. Replace <%: value %> with <%= Html.Encode(value) %>. 2. However, don t use Html.Encode() if the value being rendered comes from an HTML helper method such as Html.TextBox() or Html.ActionLink(). In this case, just replace <%: with <%=. To ensure this is clear, here are some examples: Replace <%: ViewData["someItem"] %> with

Figure 7 8. External content type top navigation ribbon This will bring up the SharePoint Designer New external content type window as shown in Figure 7 9.

Replace <%: Html.ActionLink("About") %> with <%= Html.ActionLink("About") %> (don t try to HTML-encode this value, because the HTML helper s return value is already encoded). Replace <%: Html.LabelFor(x => x.Name) %> with <%= Html.LabelFor(x => x.Name) %> (don t try to HTML-encode this value, because the HTML helper s return value is already encoded).

By following these rules, you re doing manually what <%: ... %> does automatically. I know this is inconvenient for readers using Visual Studio 2008/.NET 3.5, and I apologize for that. You might wonder why I haven t used backward-compatible syntax throughout. It s because Readers using Visual Studio 2010 and .NET 4 need to get into the habit of using

The datasource is the mechanism used to connect an ASP .NET 2.0 web application to data. For an ASP .NET application, the data is typically in a SQL Server database. To connect to a datasource, you use a connection string that sets various options for connecting to a database. There are many options available with connection strings. For the most basic connection string, you need the location of the database and the authentication details to access the database. The following is an example of such a connection string: server=localhost;database=Products;uid=webuser;pwd=webpw Notice that this includes server, database, uid, and pwd parameters, which provide all that is necessary to access the Products database on the local machine. This form should be very familiar to an ASP .NET developer. However, there are alternatives I will explain shortly.

From this window, we will access the window to discover external data sources and define the operations we will use against the data source. 1. To access the window, click the bottom link in Figure 7 9 that reads Click here to discover external data sources and define operations". This will open up the window seen in Figure 7 10.

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