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The TextBox class represents a TextBoxBase control that displays a single font. This control is part of the System.Windows.Forms namespace, and inherits from the TextBoxBase control. Through its parent class, text boxes can support single or multiple lines, and interact with the clipboard to cut, copy, or paste text. AcceptsReturn Gets or sets whether the Enter key in a multiline text box adds a new line of text or activates the default button for the form. Gets or sets how the control modifies the case of entered characters. This can be used to display all uppercase or lowercase letters in the text box. Gets or sets the character used to mask the text display in the control. When this property is set, cutting or copying to the clipboard is disabled. Gets or sets which scrollbars should appear in a multiline text box. Gets or sets how displayed text is aligned within the control. Occurs when the TextAlign property has changed.

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We will look at the keyboard events in more detail in chapter 12, but let s do a quick example here. Suppose we wanted the Caption property to only contain letters or numbers. No punctuation characters and no symbols. The KeyPress event receives keyboard characters as they are typed, and allows the event handler to handle or ignore them. The KeyPressEventArgs class is used with this event, and provides a KeyChar property to get the character pressed, and a Handled property to get or set whether the character has been handled. If Handled is set to true, then the control will not receive the character. The obvious, albeit incorrect, way to implement such a handler would be as follows:

Often in a multithreaded program, you will want the main thread to be the last thread to finish running Technically, a program continues to run until all of its foreground threads

23:

private void txtCaption_KeyPress(object sender, KeyPressEventArgs e) {

have finished Thus, having the main thread finish last is not a requirement It is, however, often good practice to follow because it clearly defines your program s endpoint The preceding program tries to ensure that the main thread will finish last, by checking the value of Count within Main( ) s do loop, stopping when Count equals 10, and through the use of calls to Sleep( ) However, this is an imperfect approach Later in this chapter, you will see better ways for one thread to wait until another finishes

char c = e.KeyChar; // Ignore all non-alphanumerics not our approach e.Handled = !(Char.IsLetter(c) || Char.IsDigit(c)); }

While the preceding program is perfectly valid, some easy improvements will make it more efficient First, it is possible to have a thread begin execution as soon as it is created In the case of MyThread, this is done by instantiating a Thread object inside MyThread s constructor Second, there is no need for MyThread to store the name of the thread since Thread defines a property called Name that can be used for this purpose Name is defined like this: public string Name { get; set; } Since Name is a read-write property, you can use it to set the name of a thread or to retrieve the thread s name Here is a version of the preceding program that makes these three improvements:

// An alternate way to start a thread using System; using SystemThreading; class MyThread { public int Count; public Thread Thrd; public MyThread(string name) { Count = 0; Thrd = new Thread(thisRun); ThrdName = name; // set the name of the thread ThrdStart(); // start the thread } // Entry point of thread void Run() { ConsoleWriteLine(ThrdName + " starting"); do { ThreadSleep(500); ConsoleWriteLine("In " + ThrdName + ", Count is " + Count); Count++; } while(Count < 10); ConsoleWriteLine(ThrdName + " terminating"); } } class MultiThreadImproved { static void Main() {