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' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Display event log While rdr.Read() ListBox1.Items.Add(rdr.GetString(0)) End While Catch ex As SqlException MessageBox.Show(ex.Message) Finally ' Remove second StateChange handler RemoveHandler conn.StateChange, AddressOf ConnStateChange2 ' Close connection conn.Close() End Try

2. Add the code in Listing 15-9 to class Form1 as a second event handler for the StateChange event.

You ll start putting Quadrant through its paces by creating a simple systems model of a car. As you know, you can analyze many complex systems (like planes, trains, and automobiles) as a composition of different levels of subsystems and components. In addition, the subsystems themselves can be further analyzed into lower level subsystems. This is a partitioning design pattern usually referred to as the composite pattern. To open Quadrant, click on the Windows Start button, then All Programs, then Microsoft SQL Server Modeling CTP Quadrant, as shown in Figure 4-1.

readyState The readyState property is read-only and indicates the state of a loaded document. Table 8-2 summarizes the values for this property and their meaning.

Listing 15-9. ConnStateChange2()

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' Second Event handler for the StateChange Event Private Sub ConnStateChange2( _ ByVal sender As Object, _ ByVal e As StateChangeEventArgs _ ) ListBox1.Items.Add("------------------------------") ListBox1.Items.Add("Entering Second StateChange Event Handler") ListBox1.Items.Add("Sender = " + sender.ToString()) ListBox1.Items.Add("Original State = " + e.OriginalState.ToString()) ListBox1.Items.Add("Current State = " + e.CurrentState.ToString()) ListBox1.Items.Add("Exiting Second StateChange Event Handler") ListBox1.Items.Add("------------------------------") End Sub

Indicates that the loading process has started and the data is being retrieved. Indicates that the data has been retrieved and that the parser is parsing the XML document. At this point, the object model is not available. Indicates that some data has been parsed, and the object model is available on a partial data set. At this stage, the object model is read-only. Indicates that the loading process is finished. Doesn t indicate whether the document was successfully loaded.

3. Build and run the solution with Ctrl+F5. Click the Multiple Handlers button. You see the results in Figure 15-6.

The initial Quadrant window, after opening, appears as shown in Figure 4-2, with much of the same look and feel as Intellipad. The lower-right corner of the status bar shows the current database name and zoom level.

Observe that the event log in Figure 15-6 shows that both the first StateChange and the second StateChange event handlers were invoked when the connection was opened, but only the first handler was invoked when the connection was closed.

onreadystatechange This event fires every time the readyState property changes. You can use it to assign a handler for the event: oDocument.onreadystatechange = processXML;

The code is almost exactly the same as for the Button1_Click method. The major difference is in the following code, where you dynamically specified the additional handler:

MSXML includes the following additions to the Node interface: xml nextNode() selectNodes() selectSingleNode() transformNode() transformNodeToObject()

You needed to do this because, unlike the ConnStateChange handler, ConnStateChange2 doesn t specify what events it handles:

Figure 4-2. The empty Quadrant window after opening To build the code for the car model, you ll start by opening a text pane for writing the M code for the model. Click File New, and then select M File, as shown in Figure 4-3.

' Second Event handler for the StateChange Event Private Sub ConnStateChange2( _ ByVal sender As Object, _ ByVal e As StateChangeEventArgs _ ) ListBox1.Items.Add("------------------------------") ListBox1.Items.Add("Entering Second StateChange Event Handler") ListBox1.Items.Add("Sender = " + sender.ToString()) ListBox1.Items.Add("Original State = " + e.OriginalState.ToString())

xml The xml property is a read-only property that returns the serialized contents of a node. In other words, it converts the raw XML into a text format: var strXML = oDocument.xml;

ListBox1.Items.Add("Current State = " + e.CurrentState.ToString()) ListBox1.Items.Add("Exiting Second StateChange Event Handler") ListBox1.Items.Add("------------------------------") End Sub

Because you added the new handler before opening the connection, both handlers were invoked when you opened it. Only the first handler was invoked when the connection was closed, because with the following code, you removed the second handler from the event before closing the connection:

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