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To understand the difference between KeyPress and KeyDown, consider what happens if the user holds down the Shift key and then presses the D key. In this scenario, the KeyPress event will fire once, and provide the exact character that was submitted (for example, the letter D). private void txt_KeyPress(object sender, KeyPressEventArgs e) { // Show the key that was pressed. lbl.Text = "Key Press: " + e.KeyChar.ToString(); } On the other hand, the KeyDown event will fire twice, once for the Shift key, and once for the D key. private void txt_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { // Show the key letter that was pressed. For example, if the user presses // the D key, the key value will always be D regardless of whether Shift // was held down or not). lbl.Text = "Key Code: " + e.KeyCode.ToString(); // Show the integer value for the key that was pressed // (like 16 for Shift or 68 for D). lbl.Text += "\nKey Value: " + e.KeyValue.ToString(); // The KeyData contains information about every key that was held down, // as a combination of values from the Keys enumeration. // You can enumerate over these values, or just call ToString() // to a get a comma-separated list. lbl.Text += "\nKey Data: " + e.KeyData.ToString(); }

This event occurs when the form will be repainted by Windows; you need to handle this event if you want to take care of drawing the control yourself For more information about this, see the Drawing WinForms section earlier in this chapter This event occurs when the user resizes the form; you could handle this event to adjust the layout of the form to a new size..

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:

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private void cmdBrowse_Click(object sender, EventArgs e) { if (openFileDialog.ShowDialog() == DialogResult.OK) { txtFileName.Text = openFileDialog.FileName; SurveyDeserializer surveyReader = new SurveyDeserializer(openFileDialog.FileName, tableLayoutPanel1); tableLayoutPanel1.SuspendLayout(); surveyReader.LoadForm(); tableLayoutPanel1.ResumeLayout(); } } In its constructor, the SurveyDeserializer stores the file name and layout panel information for future reference: private string fileName; private Panel targetContainer; public SurveyDeserializer(string fileName, Panel targetContainer) { this.fileName = fileName; this.targetContainer = targetContainer; } Next, the SurveyDeserializer.LoadForm() method begins by disposing any controls that exist inside the survey panel. public void LoadForm() { // Clear the current table content. foreach (Control ctrl in targetContainer.Controls) { ctrl.Dispose(); } ... 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.

deleted. This is not a problem if you are using a brand-new drive, as in this example. However if you are using an existing drive, you should make sure you have backed up any important files you want to keep, especially any files that have changed or been created since the last successful backup took place.

Tip In some layout situations, you may use a panel to show one of a small set of different views. In this

So far you ve looked only at a script style of programming, where you use an existing form and controls to put forms together quickly. This style of programming is great for the rapid development of singleform applications, but it has some limitations in cases where you want to create applications composed of multiple forms quickly, or you want to create libraries of forms for use with other .NET languages. In these cases, you must take a more component-oriented approach. Typically, you want to use some forms repeatedly when you create a large WinForms application; furthermore, you typically want these forms to be able to communicate with each other by adjusting each other s properties and calling each other s methods. You usually do this by defining a new form class that derives from System.Windows.Forms. Listing 8-4 shows a simple example of this, using the class syntax introduced in 5. Listing 8-4. A Demonstration of Creating a New Type of Form open System open System.Windows.Forms // a class that derives from "Form" and add some user controls type MyForm() as x = inherit Form(Width=174, Height=64) // create some controls to add the form let label = new Label(Top=8, Left=8, Width=40, Text="Input:") let textbox = new TextBox(Top=8, Left=48, Width=40) let button = new Button(Top=8, Left=96, Width=60, Text="Push Me!") // add a event to the button do button.Click.Add(fun _ -> let form = new MyForm(Text=textbox.Text) form.Show()) // do do do add the controls to the form x.Controls.Add(label) x.Controls.Add(textbox) x.Controls.Add(button)

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.

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