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Event Receivers are simply NET classes that inherit from the SPItemEventReceiver class in the same way that web parts inherit the WebPart class (though SPItemEventReciever is a SharePoint namespace, not NET) This class gives you all of the methods that could be invoked, both in response to an event and within the properties of the event, which includes the event type, the site it is in, the list, the list item that triggered the event, and so on It also provides functions such as Cancel, which enables you to stop an event You can consider an Event Receiver a broad brush when working with events Unlike a workflow attached to a specific list, receivers are installed at the site level and are based on listening to a specific type of list The type of list the receiver looks for is found by the template ID of the list (for example, an Events List Type is 106) Any list of the specified type will cause the receiver to fire (regardless of name/page) The methods are fairly self explanatory ItemAdding, for example, indicates that an item is about to be added For most event types, there are two parts: ItemAdding, followed by ItemAdded, which gives you a two-state view of the event, before it happens and after the event has completed However, you should note that this is threaded and that you can manage both states, but you cannot pass between them For example, if you were to process something during the ItemUpdating event, you can t carry it over to the ItemUpdated event, because it runs as a separate instance In short, each individual event step runs in its own instance of the Event Receiver Any particular method(s) you want to use within an Event Receiver are overridden using the standard override method, and you only need to specify the methods you want to use You can access ItemUpdated only, for example, if that is the only event you are concerned with The override statement in the code also includes the SharePoint Object Model SPItemEventProperties object, which provides you access to the event details (who fired it, data within it, and so on) The statement looks like this:.

OneTime One-time binding is used to pull the value from the source and provide it to the target one time This setting is optimal for data that will be displayed but not be modified, such as a heading

That leaves the controls themselves To select one control, you simply click the control When you select a control, several small dark squares, called handles, appear around the control You use these handles to move and resize the control The larger squares are the

public override void ItemUpdated(SPItemEventProperties properties) { baseItemUpdated(properties); }

Part II:

Notice that I ve also included the baseItemUpdated line; this ensures that the SPItemEvent inherited code is run before your custom code is This isn t mandatory, but I do it as a best practice The complete list of methods is as follows: ContextEvent This fires at the start of any event but is not accessible ItemAdded This means that an item has been added

move handles and the smaller squares are the sizing handles (Read more about moving and resizing in the section Moving and Resizing Controls later in this chapter)

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If you want to make the same change to several controls at once, such as moving them or resizing them, you can select them in one of the following ways: Hold down shift as you click each control To select a column of controls, click the selection arrow in the horizontal ruler above the controls To select a row of controls, click the selection arrow in the vertical ruler to the left of the controls To select a block of controls, click the selection arrow in one of the rulers and drag to draw a rectangle around the controls This selects all the controls inside or partially within the rectangle To select a block of controls within the design, but not a complete column or row, click the design outside of any control and draw a rectangle around the controls If the selected control is a text box, the associated label is also selected To select all the controls in the design, press ctrl-a

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