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Finally, when the X button is clicked, the drop-down is closed. The developer can also close the drop-down by clicking the arrow next to the value (the same arrow that opens the drop-down region). Private Sub cmdClose_Click(ByVal sender As Object, ByVal e As EventArgs) _ Handles cmdClose.Click editorService.CloseDropDown() End Sub The next step is to develop the type editor that uses this control. Here s the class declaration: Public Class ProgressValueEditor Inherits UITypeEditor ... End Class You can connect this type editor to the Progress.Value property using the Editor attribute, as in the previous example. All you need to do now is fill in the type editor code. This part is quite easy. First, you choose the drop-down style: Public Overrides Function GetEditStyle( _ ByVal context As ITypeDescriptorContext) _ As System.Drawing.Design.UITypeEditorEditStyle Return UITypeEditorEditStyle.DropDown End Function Once again, you turn down thumbnails: Public Overrides Function GetPaintValueSupported( _ ByVal context As ITypeDescriptorContext) _ As Boolean Return False End Function Finally, in the EditValue() method, you get the editor service, create an instance of the ProgressValueDropDown control, and add it to the Properties window using the IWindowsFormsEditorService.DropDownControl() method, as shown here: Public Overrides Function EditValue( _ ByVal context As ITypeDescriptorContext, _ ByVal provider As IServiceProvider, ByVal value As Object) _ As Object If provider IsNot Nothing Then Dim editorService As IWindowsFormsEditorService = _ CType(provider.GetService(GetType(IWindowsFormsEditorService)), _ IWindowsFormsEditorService)

Let s measure the performance gains of using the client result cache. The code in Listing 12-11 measures the performance when 1,000 rows are retrieved from the Products table with the client result cache first disabled and then enabled. Listing 12-11. Fetching 1,000 Rows with Client Result Cache Disabled and Enabled

If editorService IsNot Nothing Then ' Create the editing control. Dim ctrl As Progress = CType(context.Instance, Progress) Dim selectionControl As New ProgressValueDropDown( _ CInt(value), ctrl.Maximum, editorService) ' Show the editing control. editorService.DropDownControl(selectionControl) value = selectionControl.ProgressValue End If End If Return value End Function The final step is to attach the editor to the Value property of the Progress control using an Editor attribute: <Editor(GetType(ProgressValueEditor), GetType(UITypeEditor))> _ Public Property Value() As Integer Figure 13-18 shows the drop-down editor in the Properties window.

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Type editors also give you the chance to get a little fancy by creating a custom thumbnail of the gradient in the Properties window. You might use this trick with the GradientPanel control. To add this extra bit of finesse, all you need to do is create a type editor for the GradientFill class and override the PaintValue() method. Here s the complete code: Public Class GradientFillEditor Inherits UITypeEditor Public Overrides Function GetPaintValueSupported( _ ByVal context As ITypeDescriptorContext) As Boolean Return True End Function Public Overrides Sub PaintValue( _ ByVal e As System.Drawing.Design.PaintValueEventArgs) Dim fill As GradientFill = CType(e.Value, GradientFill) Dim brush As New LinearGradientBrush(e.Bounds, _ fill.ColorA, fill.ColorB, fill.GradientFillStyle) ' Paint the thumbnail. e.Graphics.FillRectangle(brush, e.Bounds) End Sub End Class Finally, attach the type editor to the GradientFill class with an Editor attribute: <Editor(GetType(GradientFillEditor), GetType(UITypeEditor))> _ Public Class GradientFill

Here we will only eat the fugu if fugu is set to "tasty" and the price has a value less than 100.0. Table 2-1 lists how the and operator combines values, but I hope it is self-explanatory. You can find this operator at work in real life; for example, my car will start only if the battery is not dead and I have gas. Table 2-1. Truth Table for the And Operator

private void btnClientResultCache_Click(object sender, EventArgs e)

Tip Alternatively, you could attach the GradientFillEditor directly to the GradientFill property of the

GradientPanel. But, by attaching it to the class, you ensure the GradiendFillEditor is used, by default, for any control that makes use of the GradientFill class.

{ Stopwatch _stopwatch = new Stopwatch(); String _Results; String _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;"; try { OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); OracleCommand _cmdObj = _connObj.CreateCommand(); //Insert 1,000 dummy records into the Products table _cmdObj.CommandText = "DELETE FROM Products"; _cmdObj.ExecuteNonQuery(); for (int i = 1; i <= 1000; i++)

The GradientPanel now retains its effortless design-time support, with the added frill of a thumbnail gradient in the Properties window next to the GradientFill property (see Figure 13-19). You can also reuse the GradientFill and GradientFillEditor to add similar features to countless other custom control projects.

To complement the and operator, we have the or operator, which results in True if either the first or second value is True. Let s say we want to eat fugu if it is tasty or it is very cheap (after all, who can turn down cheap fugu ): if fugu == "tasty" or price < 20.0: print "Eat the fugu!" Just like the and operator, the or operator has plenty of applications in real life. My car will stop if I run out of gas or the battery goes dead. See Table 2-2 for the or truth table. Table 2-2. Truth Table for the Or Operator

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