Monitoring the Data with Events in .NET framework

Printer ANSI/AIM Code 128 in .NET framework Monitoring the Data with Events
Monitoring the Data with Events
Code-128 Generation In .NET
Using Barcode generator for .NET Control to generate, create Code 128 Code Set A image in .NET applications.
Another important capability of data-binding scenarios, especially when there are layers of decoupling involved, is getting notified when a change to the underlying data source occurs Table 42 shows the events exposed by theBindingSource
Code 128 Code Set A Recognizer In .NET Framework
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
Table 42 BindingSource Events
Barcode Maker In VS .NET
Using Barcode generation for .NET Control to generate, create barcode image in .NET applications.
Event AddingNew Description Fires when the AddNew method is called to add a new item to the collection contained by the binding source (This event was discussed earlier in this chapter) BindingComplete Fires when each simple bound control has completed its data binding, meaning the bound control has read out the value from the current item of the collection or object to which the control is bound indirectly through the binding source This will occur each time the data binding of the simple bound control needs to be refreshed, such as when the list is initialized or when the current position changes If the binding source is bound to 10 controls, this event will fire 10 timesonce for each data-binding operation Fires when some change occurs to the current item in the collection This includes when a new item is placed into the current position, replacing the old item; the item is relocated due to an insertion or deletion of an item earlier in the list; the data source or data member changes; or the Position property changes, causing a new item to become current Fires when any of the values of the current item change This could be triggered by a ListChanged event on the IBindingList interface with a change type of ItemChanged It could also be triggered if the objects in the data source implement the INotifyPropertyChanged interface and raise the PropertyChanged event These interfaces and events are discussed in more detail in 7 DataError Is raised if the currency manager raises an exception because the binding source doesn't have internal code to handle an exception raised by the data source Usually this occurs because of invalid changes to an item or property in the data source Fires whenever the DataMember property is changed on the binding source Fires whenever the DataSource property is changed on the binding source Fires any time a change occurs to the list managed by the binding source, including adding, editing, deleting, or moving items Additionally, changes to properties that will alter the behavior of the list, such as changing the value of the AllowEdit property, should trigger this event It is also fired if the list itself is replaced with a new collection of data Whether this event is fired is dependent on the implementation of the IBindingList interface in the data source property You can check the RaiseListChangedEvents property on the binding source to determine whether subscribing to the ListChanged event will do you any good The binding source will also raise this event if changes are made to the underlying data source through the binding source, even if the data source does not support raising list changed events itself PositionChanged Fires whenever the Position property changes, making a new item current
Barcode Reader In Visual Studio .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
CurrentChanged
Code 128B Creator In C#
Using Barcode encoder for .NET framework Control to generate, create Code 128 image in Visual Studio .NET applications.
CurrentItemChanged
Encoding Code 128 Code Set A In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
DataMemberChanged DataSourceChanged ListChanged
Code-128 Maker In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code 128B image in .NET framework applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Barcode Generation In .NET Framework
Using Barcode maker for VS .NET Control to generate, create bar code image in .NET framework applications.
You can use events like PositionChanged, ListChanged, and CurrentChanged to control or synchronize the data binding of other controls on the form that aren't necessarily a strict parent-child relation that could be managed through chaining the binding sources as described earlier For example, imagine you had a data-bound combo box control on a form, and whenever a new value is selected in the combo box, you need to switch to a new data source on a second binding source that is controlling the data presented through another set of controls Perhaps the combo box contains a collection of connection strings or database names You could handle this situation with the switch on the SelectedIndexChanged event for the combo box But what if there were multiple controls on the form that could cause the currently selected item in the collection of data sources to change Using the CurrentChanged event on the binding source for the combo box and other controls, you could simply handle the situation at the binding source level instead of at the individual control level You can also use these events to synchronize data binding between collections of data beyond just master-details types of binding This is demonstrated in Listing 47 (on page 166), where the CurrentChanged event updates the display of parent item data when a selection in a collection of child objects is made You can also use the CurrentChanged event to achieve something like a master-details experience between object collections that are related through a many-to-many relationship, shown later in the section "Synchronizing Many-to-Many Related Collections"
Code 39 Full ASCII Printer In VS .NET
Using Barcode generation for VS .NET Control to generate, create Code-39 image in .NET framework applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
USS Code 128 Creation In Visual Studio .NET
Using Barcode generator for .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
Painting DataMatrix In .NET Framework
Using Barcode generator for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
EAN / UCC - 13 Generator In Java
Using Barcode maker for Java Control to generate, create EAN13 image in Java applications.
Code 128 Code Set B Printer In VB.NET
Using Barcode printer for .NET Control to generate, create USS Code 128 image in .NET applications.
Generating Universal Product Code Version A In Java
Using Barcode encoder for Java Control to generate, create UPC-A image in Java applications.
Recognize Code 39 Extended In .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.