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To make it easy to open this solution, you might want to take a moment to save it. Click the solution name (which is Components in Figure 24-3) in the Solution Explorer. Then choose File Save [SolutionName] As. You can open this .sln file later to load both the website and class library project. You can compile your class library at any point by right-clicking the project in the Solution Explorer and choosing Build. This creates a DLL assembly file (Components.dll). You can t run this file directly, because it isn t an application, and it doesn t provide any user interface.

If any of the code in the try block generates an error, then execution is automatically passed to the catch block, and it s in here that you log the error to the log file: // write the error to file StreamWriter sw = File.AppendText(Server.MapPath("~/error.log")); sw.WriteLine(ex.Message); sw.Close(); To write entries to the file, you create a StreamWriter using the System.IO.File.AppendText() static method. This method accepts a filename and opens the file for writing. If the file doesn t exist, it is created automatically. You then use the WriteLine() method to write the error message to file, and then Close() the open StreamWriter.

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Components aren t hosted by the ASP.NET service and IIS; thus, they can t be compiled automatically when they are needed. However, you can easily recompile your component in Visual Studio (and depending on the references and project settings you use, Visual Studio may perform this step automatically when you launch your web application in the design environment).

Note SQL Server User-Defined Functions (UDFs) implement common functionality that can be called from

Once you ve created your class library project, you re ready to add a class in a .vb file. Here s an example that creates a class named SimpleTest:

Note When using IIS to host your Web site, you must ensure that the user running the ASP.NET process (ASPNET under IIS5 or NETWORK SERVICE under IIS6) has the required permissions to write to the folder where you want to store the log file. In this example, the page has been running under the account that you re logged on to the machine as, and you ll have write access to the C:\BAND\04 folder, as you created it in an earlier example.

Remember, a component can contain more than one class. You can create these other classes in the same file, or you can use separate files for better organization. In either case, all the classes and source code files are compiled together into one assembly:

stored procedures. Unlike stored procedures, which can be accessed from client applications, UDFs are created for database internal usage and can be called from stored procedures or from other UDFs. UDFs must return data to the caller function or stored procedure before exiting (their last command must be RETURN) and are not allowed to modify data their role is to return information.

To add functionality to your class, add public methods or properties. The web page code calls these methods to retrieve information or perform a task. The following example shows one of the simplest possible components, which does nothing more than return a string to the calling code:

Public Class SimpleTest Public Function GetInfo(ByVal param As String) As String Return "You invoked SimpleTest.GetInfo() with '" & _ param & "'" End Function End Class Public Class SimpleTest2 Public Function GetInfo(ByVal param As String) As String Return "You invoked SimpleTest2.GetInfo() with '" & _ param & "'" End Function End Class

You then reraise the error that you ve handled, like so: // now rethrow the error throw(ex); If you don t rethrow the error, ASP.NET will, since you ve caught the error, assume that it has been handled and that any problems have been rectified. As you re only logging the error and not doing anything to fix it, you rethrow the error so that ASP.NET is aware that a problem occurred. If you don t rethrow the error, the user would be presented with a page that s equally as unhelpful as an ASP.NET error message, as shown in Figure 4-11. Whether or not an error occurred, the finally block then executes. All you want to do here is close the connection to the database, like so: // close the database connection myConnection.Close(); Although it s possible to check the state of the connection using the State property and close the connection only if it s open, this isn t necessary. If the connection is already closed, then calling the Close() method won t have any unwanted side effects.

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