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tree. Bear in mind that MySQL is an evolving piece of software, and as such, various implementation details discussed in this chapter may change over time. Always obtain the proper source versions of development documentation before you assume anything is the case for a particular version of MySQL.

Figure 2-12. Oracle Enterprise Manager login screen Once you have successfully logged in, you will be able to see a dashboard similar to the screenshot in Figure 2-13 with general statistics about the database usage. There are many things you can do with the Enterprise Manager, but covering this tool in detail is outside the scope of this book. All you need to know at this point is that your database service is up and running and that the system account and the password you ve created works.

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private void mnuSave_Click(object sender, EventArgs e) { if (saveFileDialog.ShowDialog() == DialogResult.OK) { try { using (FileStream fs = File.Create(saveFileDialog.FileName)) { BinaryFormatter f = new BinaryFormatter(); f.Serialize(fs, shapes); } } catch (Exception err) { MessageBox.Show("Error while saving. " + err.Message); } } } Deserializing is just as easy. Instead of using the Serialize() method, you use the Deserialize() method of the BinaryFormatter. You pass the stream you want to deserialize, and cast the returned object to the appropriate data type (in this case, ShapeCollection). Finally, you need to invalidate the form to trigger a refresh. private void mnuLoad_Click(object sender, EventArgs e) { if (openFileDialog.ShowDialog() == DialogResult.OK) { ShapeCollection newShapes = null; try { using (FileStream fs = File.Open(openFileDialog.FileName, FileMode.Open)) { BinaryFormatter f = new BinaryFormatter(); newShapes = (ShapeCollection)f.Deserialize(fs, null); } } catch (Exception err) { MessageBox.Show("Error while loading. " + err.Message); return; } // Trigger a refresh. shapes = newShapes; Invalidate(); } }

This chapter worked through a useful example that demonstrates how you make a dynamic drawing surface where objects can be dragged, deleted, and manipulated. We considered two approaches: building the program using .NET s support for controls, and building it by hand using only the features of GDI+. The control-based approach is a great shortcut if you want to add drawing or diagramming features to a business application in the easiest and most convenient way possible. On the other hand, the lower-level approach is the right road to take if you are planning to build a sophisticated drawing application.

The source code is organized into a shallow directory tree containing the major libraries of the MySQL server and its different extensions.

You are now ready to install the suite that contains the ODP.NET provider the Oracle Data Access Components for .NET (ODAC.NET) package. You can download the installation files from the following URL: http://www.oracle.com/technology/software/tech/windows/odpnet/index.html

xtender providers are a specialized type of component that can enhance other controls. Essentially, an extender provider works by adding virtual properties to existing controls. For example, the ErrorProvider adds an Error property that you can set to display a flashing error icon next to input controls that contain invalid information. Other examples include the ToolTip, which displays a tooltip next to other controls, and the HelpProvider, which invokes context-sensitive Help on a control s behalf when the F1 key is pressed. 4 introduced the basic extender providers included with Windows Forms. These are prebuilt components, but you can also build your own. The beauty of extender providers is that they give you another route to enhance controls. Throughout this book, you ve seen examples that have used inheritance to create customized controls. Extender providers give you another option rather than derive a custom control, you can build a lightweight component that adds just the features you need.

Table 4-1 shows all the major top-level directories, with a brief description of the files contained in each directory and the general purpose of those files. As we progress through the chapter, we ll break down the information in this table into smaller groups that relate to each subsystem, but you may use this larger table as a reference.

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