rdlc data matrix

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rdlc data matrix

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// This thread decrements SharedResCount class DecThread { int num; public Thread Thrd; public DecThread(string name, int n) { Thrd = new Thread(new ThreadStart(thisRun)); num = n; ThrdName = name; ThrdStart(); } // Entry point of thread void Run() { ConsoleWriteLine(ThrdName + " is waiting for the mutex"); // Acquire the Mutex SharedResMtxWaitOne(); ConsoleWriteLine(ThrdName + " acquires the mutex"); do { ThreadSleep(500); SharedResCount--; ConsoleWriteLine("In " + ThrdName + ", SharedResCount is " + SharedResCount); num--; } while(num > 0); ConsoleWriteLine(ThrdName + " releases the mutex"); // Release the Mutex SharedResMtxReleaseMutex(); } } class MutexDemo { static void Main() { // Construct three threads IncThread mt1 = new IncThread("Increment Thread", 5); ThreadSleep(1); // let the Increment thread start DecThread mt2 = new DecThread("Decrement Thread", 5); mt1ThrdJoin(); mt2ThrdJoin(); } }

So just what is a button, exactly For graphical interfaces, a button is a control that establishes a specific state, typically some form of on or off. Buttons are used to perform immediate actions in an interface, define the behavior for a specific feature, or

The output is shown here:

23:

turn a setting on or off. Figure 9.4 shows various styles of buttons in Windows Forms. More generally, the various types of buttons are as follows. A push button is a button that performs some immediate action, such as displaying or deactivating a dialog, or modifying the values in the window. In Windows Forms, the Button class represents a push button. A check box button allows a user to turn a specific option on or off, such as whether a file should be saved as read-only or not. In .NET, the CheckBox class can represent either a check box button or a toggle button. A toggle button appears as a normal button, but preserves an up or down state to represent a checked or unchecked mode, respectively. A radio button sometimes called an option button, is used to select from a set of mutually exclusive options. When one of a group of radio buttons is selected, the other radio buttons in the group are automatically deselected. Radio buttons can be displayed normally or as toggle buttons. Windows Forms provides the RadioButton class for the creation of these objects. All radio buttons in the same container are automatically part of the same group. Use container classes such as GroupBox and Panel to support multiple groups of radio buttons on your forms.

Decrement Thread is waiting for the mutex In Increment Thread, SharedResCount is 1 In Increment Thread, SharedResCount is 2 In Increment Thread, SharedResCount is 3 In Increment Thread, SharedResCount is 4 In Increment Thread, SharedResCount is 5 Increment Thread releases the mutex Decrement Thread acquires the mutex In Decrement Thread, SharedResCount is 4 In Decrement Thread, SharedResCount is 3 In Decrement Thread, SharedResCount is 2 In Decrement Thread, SharedResCount is 1 In Decrement Thread, SharedResCount is 0 Decrement Thread releases the mutex

Figure 9.4 The three types of buttons in various styles. Note how both check boxes and radio buttons can appear as toggle buttons.

As the output shows, access to SharedResCount is synchronized, with only one thread at a time being able to change its value To prove that the Mtx mutex was needed to produce the preceding output, try commenting out the calls to WaitOne( ) and ReleaseMutex( ) in the preceding program When you run the program, you will see the following sequence (the actual output you see may vary):

In In In In In In In In In Increment Decrement Increment Decrement Increment Decrement Increment Decrement Increment Thread, Thread, Thread, Thread, Thread, Thread, Thread, Thread, Thread, SharedResCount SharedResCount SharedResCount SharedResCount SharedResCount SharedResCount SharedResCount SharedResCount SharedResCount is is is is is is is is is 1 0 1 0 1 0 1 0 1

In figure 9.4, note how each button supports a normal three-dimensional style as well as a flat style. In addition, note that toggle buttons appear identical to regular push buttons. Unlike push buttons, a toggle button preserves an in or out state when they are pressed. All buttons in .NET inherit from the ButtonBase class. This class provides common functionality for all buttons, including the flat style setting and whether to display an image on the button. An overview of this class appears in .NET Table 9.4.