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In the application, the first step is to choose a survey file by clicking the Browse button. At this point, a dialog box is shown with all the available survey files (which are given a .frm extension). Once a file is selected, the work is handed off to the SurveyDeserializer class: Private Sub cmdBrowse_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles cmdBrowse.Click If openFileDialog.ShowDialog() = System.Windows.Forms.DialogResult.OK Then txtFileName.Text = openFileDialog.FileName Dim surveyReader As New SurveyDeserializer( _ openFileDialog.FileName, tableLayoutPanel1) tableLayoutPanel1.SuspendLayout() surveyReader.LoadForm() tableLayoutPanel1.ResumeLayout() End If End Sub In its constructor, the SurveyDeserializer stores the file name and layout panel information for future reference: Private fileName As String Private targetContainer As Panel Public Sub New(ByVal fileName As String, ByVal targetContainer As Panel) Me.fileName = fileName Me.targetContainer = targetContainer End Sub Next, the SurveyDeserializer.LoadForm() method begins by disposing any controls that exist inside the survey panel. Public Sub LoadForm() ' Clear the current table content. For Each ctr As Control In targetContainer.Controls ctrl.Dispose() Next ...

Note that it s not enough to call the Panel.Controls.Clear() method. This removes the control objects from the Controls collection, but it doesn t release them. As a result, you ll tie up control handles every time you generate a new form and reduce system performance.

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Used to define the compilation identifier, such as the INTEGRATE_ TESTS identifier used in this chapter s example. You would define this at the top of a source code file to activate conditional preprocessor statements used throughout the source code file. Using a #define directive does not span multiple source code files. Used to undefine an identifier. You would use #undef if you wanted to change a global setting. Let s say that an identifier is set globally, but for a particular source code file, you want the behavior as if the identifier were not set. In that case, you use #undef. Another way to achieve this behavior is to use the ! character in front of the identifier. Used to conditionally include or not include a piece of source code. You would use a conditional directive whenever you wanted to define source code configurations, such as for debug or production builds. Instead of a single #if block, you could have multiple tests for code inclusion. You would use #elif when you have more than a single preprocessor directive, such as for debug, production, and performance builds. A default code block that is included if the other #if statements did not trigger. These have absolutely nothing to do with the compilation of the source code. They are used by Visual Studio to create regions of source code that can be folded. Folding means to collapse a block of code out of sight temporarily. Source code files can become long, and constantly paging up and down becomes tedious. By folding the code, you are reducing the amount of times that you need to page up and down, even though the code still exists.

Tip In some layout situations, you may use a panel to show one of a small set of different views. In this scenario, the most efficient way to deal with your controls is to simply hide them (or their container), rather than dispose and re-create them.

// wire up the event handlers temp.MouseUp |> Event.add mouseUp temp.MouseMove |> Event.filter(fun _ -> !mouseDown) |> Event.add mouseMove temp.Paint |> Event.add paint // return the form object temp [<STAThread>] do Application.Run(form)

The next step is to read the survey file into an in-memory XmlDocument object. The code then iterates over the panel elements, checking to make sure that the type matches one of the values defined in the enumeration. ... Try ' Load the form into memory. Dim doc As New XmlDocument() doc.Load(fileName) ' Iterate over panel nodes. For Each nodePanel As XmlNode In doc.DocumentElement.ChildNodes ' Convert the element name into the appropriate enum value. Dim type As PanelTypes = CType([Enum].Parse( _ GetType(PanelTypes), nodePanel.LocalName), _ PanelTypes) ' Check for caption node. Dim caption As String = CheckForAttribute(nodePanel, "caption") ... You ll notice that the code also makes use of a simple CheckForAttribute() method, which looks for an attribute with a specific name. If the attribute is found, CheckForAttribute() returns its value. If not, CheckForAttribute() returns an empty string. The work of actually creating the corresponding container is handed off to another method, called CreateContainer(). It generates the container control that will hold the content for that survey element. ... ' Create the container for this survey element. ' It's placed into the next available cell. Dim container As Control = CreateContainer(type, caption) ... Finally, the code loops through all the tags in the container. These are the <SelectionItem> and <TextItem> elements that define specific text boxes, check boxes, or radio buttons. Each time it finds a nested element, the code extracts the relevant id and caption information and

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