c# get barcode input Understanding Data-Binding in Windows Forms in .NET

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Understanding Data-Binding in Windows Forms
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The Microsoft .NET Framework provides an extremely powerful and flexible mechanism for binding data to properties of controls. Although in the majority of cases you will bind to the displayed value of a control for example, the DisplayMember property of a ListBox control or the Text property of a TextBox control you can bind any property of a control to a data source. This makes it possible, for example, to bind the background and foreground colors of a form and the font characteristics of its controls to a row in a database table. By using this technique, you could allow users to customize an application's user interface without requiring any changes to the code base. Data Sources Windows Forms controls can be bound to any data source, not just traditional database tables. Technically, to qualify as a data source, an object must implement the IList, IBindingList, or IEditableObject interface. The IList interface, the simplest of the three, is implemented by arrays and collections. This means that it's possible, for example, to bind the Text property of a label to the contents of a ListBox control's ObjectCollection (although it's difficult to think of a situation in which doing so might be useful). Any object that implements both the IList and the IComponent interfaces can be bound at design time as well as at run time. The IBindingList interface, which is implemented by the DataView and DataViewManager objects, supports change notification. Objects that implement this interface raise ListChanged events to notify the application when either an item in the list or the list itself has been changed. Finally, the IEditableObject interface, which is implemented by the DataRowView object, exposes the BeginEdit, EndEdit, and CancelEdit methods. Fortunately, when you're working within ADO.NET, you can largely ignore the details of interface implementation. They're really only important if you are building your own data source objects.
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Within the .NET Framework, the actual binding of data in a Windows form is handled by a number of objects working in conjunction, as shown below.
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At the highest level in the logical architecture is the BindingContext object. Any object that inherits from the Control class can contain a BindingContext object. In most cases, you'll use the form's BindingContext object, but if your form includes a container control, such as a Panel or a GroupBox, that contains data-bound controls, it may be easier to create a separate BindingContext object for the container control because it saves a level of indirection when referencing the contained controls. The BindingContext object manages one or more BindingManagerBase objects, one for each data source that is referenced by the form. The BindingManagerBase is an abstract class, so instances of this object cannot be directly instantiated. Instead, the objects managed by the BindingContext object will actually be instances of either the PropertyManager class or the CurrencyManager class. All of these objects are implemented in the System.Windows.Forms namespace. If the data source can return only a single value, the BindingManagerBase object will be an instance of the PropertyManager class. If the data source returns (or can return) a collection of objects, the BindingManagerBase object will be an instance of the CurrencyManager class. ADO.NET objects will always instantiate CurrencyManagers. The CurrencyManager object keeps track of position in the list and managesthe bindings to that data source. Note that the data source itself doesn't know which item is being displayed. ADO The CurrencyManager's Position property maintains the current row in a data source. ADO.NET data sources don't support cursors and therefore have no knowledge of the 'current' row. This may at first seem awkward, but is actually a more powerful architecture because it's now possible to maintain multiple 'cursors' in a single data source. There is a separate instance of the CurrencyManager object for each discrete data source. If all of the controls on a form bind to a single data source, there will be a single CurrencyManager. For example, a form that contains text boxes displaying fields from a single table will contain a single CurrencyManager object. However, if there are multiple data sources, as in a form that displays master/detail information, there will be separate CurrencyManager objects for each data source. Windows Forms controls contain a DataBindings collection that contains the Binding objects for that control. The Binding object, as we'll see, specifies the data source, the control that is being bound, and the property of the control that will display the data for simple-bound properties.
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The CurrencyManager inherits a BindingsCollection property from the BindingManagerBase class. The BindingsCollection contains references to the Binding objects for each control.
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