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Run the GetEmpDept macro to get the initial data on the worksheet Then run the AppendEmpDeptInfo procedure from the Macro dialog box The result is identical, but the XMLSourceFile property was not modified In case the contents of the file you re reading will be updated from time to time by external sources, the XmlMaps collection has the ability to refresh the data source Add a new method to the cXML class called RefreshXML Here is the code for the RefreshXML method: Public Function RefreshXML() ActiveWorkbookXmlMaps(m_sMapName)DataBindingRefresh End Function Now that we have our XML data in a worksheet, we can modify it or add records We need to add one last bit of functionality to our class: the ability to save the data back to XML Reset your project by closing without saving and reopening it Add a new method to the cXML class called SaveToFile.

Now, let s create a new topmost menu item named Change Background Color. The subitem in this case will not be a menu item, but a ToolStripTextBox (see Figure 19-13). Once you have added the new control, rename this control to toolStripTextBoxColor using the Properties window.

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The goal here is to allow the user to enter the name of a color (red, green, pink, etc.) that will be used to set the BackColor property of the Form. First, handle the LostFocus event on the new ToolStripTextBox member variable within the Form s constructor (as you would guess, this event fires when the TextBox within the ToolStrip is no longer the active UI element): public MainWindow() { ... toolStripTextBoxColor.LostFocus += new EventHandler(toolStripTextBoxColor_LostFocus); } Within the generated event handler, you will extract the string data entered within the ToolStripTextBox (via the Text property) and make use of the System.Drawing.Color.FromName() method. This static method will return a Color type based on a known string value. To account for the possibility that the user enters an unknown color (or types bogus data), you will make use of some simple try/catch logic: void toolStripTextBoxColor_LostFocus(object sender, EventArgs e) { try { BackColor = Color.FromName(toolStripTextBoxColor.Text); } catch { } // Just do nothing if the user provides bad data. }

Note A Braille-tactile feedback device translates alphabetical characters on screen into the Braille equivalent through a series of pins that are raised on the fly. Visually impaired users would normally pass their fingertips over a page of characters and feel the characters, but in one of these devices, the raised pins scroll past underneath the user s fingertips.

Go ahead and take your updated application out for another test drive and try entering in the names of various colors. Once you do, you should see your Form s background color change. If you are interested in checking out some valid color names, look up the System.Drawing.Color type using the Visual Studio 2005 Object Browser or the .NET Framework 2.0 SDK documentation.

Let s now examine the process of building a context-sensitive pop-up (i.e., right-click) menu. Under .NET 1.1, the ContextMenu type was the class of choice for building context menus, but under .NET 2.0 the preferred type is ContextMenuStrip. Like the MenuStrip type, ContextMenuStrip maintains a ToolStripItemCollection to represent the possible subitems (such as ToolStripMenuItem, ToolStripComboBox, ToolStripSeperator, ToolStripTextBox, etc.). Drag a new ContextMenuStrip control from the Toolbox onto the Forms designer and rename the control to fontSizeContextStrip using the Properties window. Notice that you are able to populate the subitems graphically in much the same way you would edit the Form s main MenuStrip (a welcome change from the method used in Visual Studio .NET 2003). For this example, add three ToolStripMenuItems named Huge, Normal, and Tiny (see Figure 19-14).

The finished SaveToFile method will look like this: Public Function SaveToFile(Optional SaveAsFileName As String = "FileNotSet") 'if no SaveAsFileName is provided the current XMLSourceFile will be overwritten Dim ExportMap As XmlMap If SaveAsFileName = "FileNotSet" Then SaveAsFileName = m_sXMLSourceFile End If Set ExportMap = ActiveWorkbookXmlMaps(m_sMapName) If ExportMapIsExportable Then ActiveWorkbookSaveAsXMLData SaveAsFileName, ExportMap Else MsgBox ExportMapName & " cannot be used to export XML" End If End Function We ve included an optional argument for the file name of the saved document and passed in a default nonsense value If we want to save the data back to the file from which it came, we simply call the method with no argument The code will use whatever file is stored in the XMLSourceFile property If we want to write the data out to a new file, we pass in the new file name.

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