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When there is a built-in conversion and formatting process, the binding approach outlined so far is the easiest and most straightforward approach However, there are always times when you need to do something a little different than the standard data-binding mechanisms support, so knowing how to go beyond the built-in type conversions is an important skill in your data-binding toolbox Understanding the limitations of these custom approaches is also important For now, let's just focus on simple data binding You can take control of the whole data-binding process for individual control properties by handling a number of different events, including events raised by the binding object itself and events raised by the control that is being bound In fact, you often need to handle both control events and binding events to ensure that edited values in controls are pushed down into the data source before a form is closed The two Binding class events of interest are theFormat and the Parse events A number of other Binding class events are simple notifications that you can subscribe to if you are interested in knowing when any of the properties affecting data binding change, such as the FormatString and NullValue properties As you might suspect from the preceding sections, the Format event is aised when the value is being pulled out of the data source property and before the bound control property is set using that value The Parse event is the reverse: It is fired when the value has changed in the control property and is going to be written back into the corresponding data source property for two-way data binding The Format and Parse events give you explicit control over the values being set while data binding Both events are declared using the same delegate type, a ConvertEventHandler, and they take two arguments The first argument follows the pattern for most Windows Forms events and is an object reference that refers to the publisher of the event; the second argument is a ConvertEventArgs parameter, which lets you step in and provide whatever value you want when formatting and parsing occurs The ConvertEventArgs parameter has two properties that you will want to use to control the data-binding process The DesiredType property tells you what type is needed for the object value being set For the Format event, this represents the type of the property on the bound control and is an instance of the Type class that provides the metadata about the property type For the Parse event, it specifies the type of the data source property that is being written to The Value property gives you access to the object that is currently going to be used to try to set that property on the control or the data source If you do nothing with the value, then the Binding class ends up just trying to set the property value using the current value Normal type conversions will apply if automatic formatting is turned on (as discussed earlier in the section on automatic formatting) However, the Value property is an object reference, so you can replace the value with anything you like If you do, whatever you set the Value property to is what will be used to set the value of the control or data source property The Format and Parse events fire before automatic type conversions are applied As a result, if you turn on automatic formatting and provide a different value through the Value property, the automatic formatting will be applied to the object that you set as the Value, instead of the one that was pulled out of the data source property or control property To demonstrate some of the things you can do through binding events, the download code for this chapter contains a project named BindingEvents, which contains the currency exchange rate application shown in Figure 46 To use this application, you first have to create a new database called MoneyDB There is a script named MoneyDBsql in the download code for 4 that you can run from SQL Query Analyzer to create and populate the database with some sample data There is also an additional application called MoneyDBAdmin that you can use to edit, add, or delete data from the tables in this database.

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an ASP.NET Web Solution and used like any other control in the Visual Studio development toolbox . { //Create an instance of the Linear barcode server control .Related:

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Then, to get the type back when retrieving an instance of a custom class, retrieve the roperty from the shared object s data property and upcast it to the type that it should be, as shown in Example 29-3. use .net crystal linear barcode maker toincoporate 1d on .net. Control barcode code .Related: EAN-8 Generator ASP.NET , Create Codabar Excel , .NET WinForms Interleaved 2 of 5 Generator

When you're happy with your control, you can add it to the Toolbox by dragging the user control's source code file, in this case UserControl1cs, from the Solution Explorer to the Toolbox When it's here, you can drag and drop it onto the forms of your choice, setting properties and handling events via the Property Browser just as with any of the built-in controlsFigure 113 shows the user control from Figure 112 hosted on a form.

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in Java Maker EAN 13 in Java ignoring any . and qr bidimensional barcode data, size, image with java barcode sdk. . Primarily, you ll be using the Graphics class, which acts s a canvas for drawing vector graphics. The Graphics class is an abstract class; you can t create instances of it directly with new Graphics(). Furthermore, it s not a DisplayObject, so you can t add it to the display list. To get your vector drawings on stage, you use the existing Graphics instances that are attached to all your favorite display objects: Sprite, MovieClip, and Shape. Each of these classes has a public property called graphics that you can access to draw programmatically into the instance.Related: UPC-E Generation C# , Print ITF-14 C# , QR Code Generator ASP.NET

As some applications get more sophisticated, users expect more from all their applications For example, some applications let users set fonts and colors and all kinds of crazy things (guaranteeing that you'll never be able to successfully test every combination) In addition to the other fancy user interface (UI) features that it provides, WinForms supports the idea of reading a control's properties from an application's configuration file, also called a config file NET allows every application to have a config file associated with it For example, when NET loads MySecondAppexe, it will look for a corresponding MySecondAppexeconfig file in the same folder as the application A config file can have standard settings for things such as security, remoting, loading, and versioning In addition to standard NET settings, a configuration file can have custom settings strictly for the application's use For example, the following is a config file containing settings specifying a custom key-value pair: <configuration> <appSettings> <add key="MainFormOpacity" value="5" /> </appSettings> </configuration> Notice that the config file is in XML format This means hat savvy users can open the config file in Notepad to change the setting For this setting to be used to set the main form's opacity property, the setting needs to be read: using SystemConfiguration; public class MainForm : SystemWindowsFormsForm { public MainForm() { InitializeComponent(); // After InitializeComponent call AppSettingsReader appSettings = new AppSettingsReader(); object o = appSettingsGetValue(".

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