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After you create the EPR database, tables, and stored procedures, the next task is to create the SQLPersistenceService database. You might have installed this database for 9; if so, you can skip the rest of this section and go on to create the ASP.NET Web site. WF includes two scripts to add tables and logic to the persistence database. You can find the scripts at C:\[windows directory]\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\[language]\ in most installs. Two files for SQL persistence are in this folder. The first is SQLPersistenceService_Schema. This creates the tables necessary for the service to work. The other script is SQLPersistenceService_Logic. This script creates the stored procedures needed by the SQL Persistence Service.

If it is so similar in signature, why doesn t Console derive from Text Writer TextWriter is intended to be used with some underlying resource that needs proper lifetime management, so it implements IDisposable. Our code would be much less readable if we had to wrap every call on Console with a using block, or remember to call Dispose especially as it isn t really necessary. So, why make TextWriter implement IDisposa ble We do that so that our text-writing code can be implemented in terms of this base class, without needing to know exactly what sort of TextWriter we re talking to, and still handle the cleanup properly.

3. 4.

The File class s CreateText method calls a constructor on StreamWriter which opens the newly created file, and makes it ready for us to write; something like this:

return new StreamWriter(fullPath, false);

There s nothing to stop you from doing this yourself by hand, and there are many situations where you might want to do so; but the helper methods on File tend to make your code smaller, and more readable, so you should consider using those first. We ll look at using Stream Writer (and its partner, StreamReader) in this way later in the chapter, when we re dealing with different sorts of underlying streams.

5. 6.

Hang on, though. We ve snuck a second parameter into that constructor. What does that Boolean mean When you create a StreamWriter, you can choose to overwrite any existing file content (the default), or append to what is already there. The second Boolean parameter to the constructor controls that behavior. As it happen, passing false here means we want to overwrite.

This is a great example of why it s better to define nicely named enumerations, rather than controlling this sort of thing with a bool. If the value had not been false, but some mythical value such as OpenBehav ior.Overwrite, we probably wouldn t have needed to explain what it did. C# 4.0 added the ability to use argument names when calling methods, so we could have written new StreamWriter(fullPath, append: false), which improves matters slightly, but doesn t help you when you come across code that hasn t bothered to do that.

So, now we can easily complete the implementation of our CreateFile method, as shown in Example 11-22.

Summary

private static void CreateFile(string fullPath, string p) { using (StreamWriter writer = File.CreateText(fullPath)) { writer.Write(p); } }

We just write the string we ve been provided to the file. In this particular application, Example 11-22 isn t an improvement on Example 11-20 we re just writing a single string, so WriteAllText was a better fit. But StreamWriter is an important technique for less trivial scenarios.

In this chapter, you have seen how you can share resources in multiple ways for both Linux and Windows networks, as well as the ways that FTP, NFS, and Samba come into play. FTP can be a good solution if you only want to distribute files for everyone to download. NFS is best for Linux- or Unixbased file sharing in real time. Samba is the server for sharing files, and even printers, on a Windows network. But your options do not stop here, because each server has many features and enhancements. For example, you could improve security of each server through pluggable authentication modules. Also, for Windows administrators who want to manage bigger Windows networks, the stand-alone server can be transformed into a full-pledged domain controller for the task. And Samba can fuse with OpenLDAP to create a lightweight directory mechanism for unified authentication when required. In the next chapter, you will see how use mail servers to provide mail services to your networks and manage user mailboxes.

After you ve created the EPR and SQLPersistenceService databases, you can create the ASP.NET Web site. Open Visual Studio 2005 and click File New Web Site. When the New Web Site screen appears, click the Browse button. This allows you to create a Web site but point to the file location. The folder VBEmployeePerformanceReview that was included with the book s downloadable code includes a folder called EPRWeb. That s the folder you want to find. When the Choose Location screen appears, click File System and find the folder mentioned earlier, as shown in Figure 10-3.