qr code generator c# source code UNDERSTANDING PERFORMANCE OPTIMIZATION METHODS in visual C#


This category represents a catch-all of features, many of which provide infrastructure-level support that may be fully out of direct sight, but which is working on your behalf nonetheless. The System services includes infrastructurelevel support for transactions (via a distributed transaction coordinator) and security. The security portion of the System services are expected to support the WS-Federation specification, which allows you to set up and manage trusted communications across application and domain boundaries. This is not the same
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So far, we have looked mostly at locks that Oracle places for us transparently. When we update a table, Oracle places a TM lock on it to prevent other sessions from dropping that table (or performing most DDL, in fact). We have TX locks that are left on the various blocks we modify so others can tell what data we own. The database employs DDL locks to protect objects from change while we ourselves are changing them. It uses latches and locks internally to protect its own structure. Next, let s take a look at how we can get involved in some of this locking action. Our options are as follows: Manually lock data via a SQL statement. Create our own locks via the DBMS_LOCK package.
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13. Name the new State group MouseStates and set the Default transition time to .3 seconds,
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One common view of good UI design holds that the user should be free to enter arbitrary text, and it is up to the application to make sense of the entry. Nowhere is this truer than with date values, and the SmartDate type is designed to simplify how a business developer uses dates and exposes them to the UI. Examples of free-form date entry are easy to find. Just look at widely used applications like Microsoft Money or Intuit s Quicken. In these applications, users are free to enter dates in whatever format is easiest for them. Additionally, various shortcuts are supported; for example, the + character means tomorrow, while means yesterday. Most users find this approach more appealing than being forced to enter a date in a strict format through a masked edit control, or having to always use the mouse to use a graphical calendar control. Of course, being able to additionally support a calendar control is also a great UI design choice. Date handling is also quite challenging because the standard DateTime data type doesn t have any comprehension of an empty or blank date. Many applications have date values that may be empty for a time and are filled in later. Consider a sales order, in which the shipment date is unknown when the order is entered. That date should remain blank or empty until an actual date is known. Without having the concept of an empty date, an application will require the user to enter an invalid placeholder date until the real date is known; and that s just poor application design.
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Unlike the C++ destructor, a C# finalizer is not called immediately when an instance goes out of scope. In fact, there is no way of knowing when the finalizer will be called. Furthermore, as mentioned, you cannot explicitly call a finalizer. If your code needs one, you just provide it for the system, which will call it at some point before the object is destroyed. If your code contains unmanaged resources that should be released in a timely manner, you should not leave that for the finalizer, since there is no guarantee that the finalizer will run anytime soon. Instead, you should adopt the convention of encapsulating the cleanup code for these resources in a void, parameterless method. By convention, you should call it Dispose. When you re done with the resources and want them released, call Dispose. Notice that you need to invoke Dispose it is not the finalizer, and the system will not call it for you automatically. Some guidelines for your Dispose method are the following: Implement the code in Dispose in such a way that it is all right if the method is called more than once. It should not cause an exception to be raised, and it should not do any additional work on subsequent calls. Don t assume that Dispose will get called. Make sure that the finalizer will release the resources if, for some reason, Dispose isn t called.
Canvas canvas = new Canvas { Background = new SolidColorBrush(Color.FromArgb(255, 255, 255, 255))}; Grid grid = new Grid { Height=140, Width=250 }; grid.SetValue(Canvas.LeftProperty, 25d); grid.SetValue(Canvas.TopProperty, 15d); grid.RowDefinitions.Add(new RowDefinition()); grid.RowDefinitions.Add(new RowDefinition()); grid.RowDefinitions.Add(new RowDefinition()); grid.RowDefinitions.Add(new RowDefinition()); ColumnDefinition cd = new ColumnDefinition(); cd.Width = new GridLength(0, GridUnitType.Auto); grid.ColumnDefinitions.Add(cd); grid.ColumnDefinitions.Add(new ColumnDefinition()); TextBlock headerText = new TextBlock { HorizontalAlignment = HorizontalAlignment.Center, Text = "Please enter your information" }; headerText.SetValue(Grid.ColumnProperty, 0); headerText.SetValue(Grid.ColumnSpanProperty, 2); headerText.SetValue(Grid.RowProperty, 0); TextBlock usernameText = new TextBlock { HorizontalAlignment = HorizontalAlignment.Right, Text = "Username:" }; usernameText.SetValue(Grid.ColumnProperty, 0); usernameText.SetValue(Grid.RowProperty, 1); TextBox usernameInput = new TextBox { VerticalAlignment = VerticalAlignment.Top }; usernameInput.SetValue(Grid.ColumnProperty, 1); usernameInput.SetValue(Grid.RowProperty, 1); TextBlock passwordText = new TextBlock { HorizontalAlignment = HorizontalAlignment.Right, Text = "Password:" }; passwordText.SetValue(Grid.ColumnProperty, 0); passwordText.SetValue(Grid.RowProperty, 2); PasswordBox passwordInput = new PasswordBox { VerticalAlignment = VerticalAlignment.Top }; passwordInput.SetValue(Grid.ColumnProperty, 1); passwordInput.SetValue(Grid.RowProperty, 2); Button loginButton = new Button { Content = Login , HorizontalAlignment = HorizontalAlignment.Left, Width = 100 }; loginButton.SetValue(Grid.ColumnProperty, 1); loginButton.SetValue(Grid.RowProperty, 3);
Figure 3-1. A type is a template.
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