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Figure 13-17. The user control for a drop-down type editor Because this control is intended solely to be used at design-time, it makes sense to keep it out of the toolbox. You can accomplish this by adding the ToolboxItem attribute to the class declaration and marking it False: <ToolboxItem(False)> _ Public Class ProgressValueDropDown ... End Class The real trick in this example is that the user control you create for editing the property needs a way to receive information from the custom control object. To make this easier, you should add a constructor to your editing control that accepts all the information it needs. In this case, you need two details: the maximum and current values. (The Progress control in its current implementation forces developers to use a minimum of 0.) Additionally, it s a common convention to accept an IWindowsFormEditorService object that represents the editing service in Visual Studio. (You ll learn more about design-time services in 26.) The reference to the editing service allows the control to close the drop-down after the editing is complete. In this example, you don t need to close the drop-down. Instead, it makes more sense to leave the drop-down open, so the developer can try out several settings.

Often you have several conditions you want to check for. Let s say we want to eat fugu if it is tasty and under $100 a plate. We can combine these two conditions with the and operator: price = 50.0 if fugu == "tasty" and price < 100.0: print "Eat the fugu!"

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It is, of course, not a good idea to cache every single SQL statement that you execute. The best performance gains come from caching statements that you know are going to be executed repeatedly. To get a feel of the performance benefits of statement caching, let s consider the following SQL statement: SELECT empID FROM Employees WHERE Status=:1 If we run 1,000 iterations of the preceding SQL code with statement caching turned on and another time with statement caching turned off, we get these performance statistics: Without Statement Caching : 0.7314417 total seconds With Statement Caching : 0.4133213 total seconds As you can see, using statement caching on highly repetitive code can lead to significant performance boosts and should be considered whenever possible.

However, this feature is still useful, because it provides the functionality for the X button in the top-right corner of the drop-down. Here are the constructor code and the details for storing the constructor-supplied information: Private _progressValue As Integer Public Property ProgressValue() As Integer Get Return _progressValue End Get Set(ByVal value As Integer) _progressValue = value End Set End Property Private editorService As IWindowsFormsEditorService Public Sub New(ByVal value As Integer, ByVal maximum As Integer, _ ByVal editorService As IWindowsFormsEditorService) InitializeComponent() ' Store this information for later use. ProgressValue = value Me.editorService = editorService ' Apply the current information. trackBar1.Maximum = maximum lblRange.Text = "Allowed Range: (0, " & maximum.ToString() & ")" trackBar1.Value = value trackBar1.SmallChange = 1 trackBar1.LargeChange = 5 End Sub Public Sub New() ' Default constructor required for designing ' this control in Visual Studio. InitializeComponent() End Sub Every time the value in the track bar is changed, the Value property is updated: Private Sub trackBar1_ValueChanged(ByVal sender As Object, _ ByVal e As EventArgs) Handles trackBar1.ValueChanged ProgressValue = trackBar1.Value lblValue.Text = "Current Value = " & trackBar1.Value.ToString() End Sub

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