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Even after taking great care during the coding phase, errors can crop up at run time in your website. Users make typos in page URLs, try to access areas that are restricted, network failures can happen, and so on. As a robust programming practice, you should make provisions to trap all such unexpected errors. In classic ASP, developers used to set custom error pages for web-server level errors (file not found, access denied, and so on) in IIS. This required physical access to the web server. Thankfully, ASP.NET allows you to specify such custom error pages in the web.config file. Let s see how.

sqlComm.Connection = sqlCon; sqlComm.CommandType = CommandType.Text; sqlComm.CommandText = "SELECT AddressLine1 FROM Person.Address " + "WHERE (PostalCode = N'98011')"; sqlCon.Open(); SqlDataReader sRead = sqlComm.ExecuteReader(); while (sRead.Read()) { strReturn.Append("<li>"); strReturn.Append(sRead["AddressLine1"]); strReturn.Append("</li>"); } } litResults.Text = strReturn.ToString(); } }

1

Business intelligence and other analytical applications often use charts to communicate information. Some portal projects create digital dashboards that represent the current state of the organization for managers for instance, a sales manager could see outstanding sales calls for each salesperson, sales margins for products, and profit projections for the quarter. We use the open source charting product JFreeChart to develop charts for portlets in 14.

You can see the results of running this in Figure 4-17.

Create a new website in Visual Studio. Add a new folder in it called Admin. This folder is supposed to contain administrative pages, and users are unauthorized to access it. Add five web forms as shown in Table 11-3. Table 11-3. Web Forms Arrangement

In 15, we discuss two standards for communicating with content management systems: the Java Content Repository API and the WebDAV protocol. We create a portlet that uses the WebDAV protocol to integrate with a content management system. In this chapter, we use the open source WebDAV client library from the Apache Slide project to build our portlet.

Now, this is all very well for a fixed SQL statement like the one we had hard-coded to query for postal code 98011. But what happens if you want the user to specify the postal code that they are searching for You achieve this using parameters. Thus, you can provide an application where the user specifies (using text input, request parameters, or other input mechanisms) what they want, and your application responds accordingly. Be careful when using parameters in SQL statements that are derived from user input, as this is a common source of SQL injection attacks. This type of hacker attack involves a cleverly crafted parameter value on the user s part and an insecure application that doesn t validate user input. This attack can allow a malicious user to access private data or even destroy your database. To use a parameter in SQL, you specify a placeholder for the parameter by prefixing it with the @ character. So, for example, our hard-coded query from earlier could be changed to this:

Summary

The default page of the website Custom error page that is displayed for HTTP error code 404 Custom error page that is displayed for HTTP error code 403 Custom error page that is displayed for any other unhandled error in code or otherwise Represents the default page of the Admin folder

Portal projects that use standards are going to be easily portable to new portal containers, and developers can use portlets from third-party vendors to create their portals. Before starting work on the production version of your portal, develop an information architecture from the user s perspective. It should show how the portal is going to look, what it is going to do, and what problems it solves. Start small, with a prototype or deployment to a limited number of users, and build out from there, to ensure that your portal deployment scales.

sqlComm.CommandText = "SELECT AddressLine1 FROM Person.Address WHERE (PostalCode = @strZIP)";

Now design Default.aspx from the root folder to look like the page shown in Figure 11-36.

NOTE The authors created a web site for this book at www.portalbook.com. We will have interesting articles, sample portlets, and more information about upcoming portal standards and APIs.

Then, before executing, you add the value of the parameter to the command, like this: