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Then, inside your Receivers element, you add a Receiver child element and some more child elements to the Receiver element. Deploy your feature, activate, and boom Bob s your uncle. A sample elements file to deploy an item event receiver to a list template may look like this: < xml version="1.0" encoding="utf-8" > <Elements xmlns="http://schemas.microsoft.com/sharepoint/"> <Receivers> <Receiver> <Assembly>YOUR STRONG NAME HERE</Assembly> <Class>YOUR CLASS NAME HERE</Class> <Data></Data> <Filter></Filter> <Name>My event receiver</Name> <Type>ItemAdded</Type> <SequenceNumber>10</SequenceNumber> </Receiver> </Receivers> </Elements> A few things are worth noticing about this element. You can add custom data to your receiver inside the Data element, which is useful if you want to have the same receiver code but make it behave differently. For example, you may have a verification receiver that checks whether values are valid for a wide range of lists. You can customize the error message or the verification procedure itself using custom data, while maintaining just a single piece of code. There is also a Filter element in the Receiver schema. I have yet to find any documentation, information, or examples regarding this element. Yes, this is indeed undocumented, but as far as anyone seems to know, it is also unused. It is safe to ignore this element completely; perhaps it is reserved for future use. The Sequence element is used to decide the order in which multiple event receivers run. The Name element is just for your convenience, and you can call your event receiver element Johnny Fartypants if that makes you happy. As for Assembly and Class well, I ll leave you to figure out what those do.

5. Double-click the combo box and add the following code: Private Sub cbBackColor_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbBackColor.SelectedIndexChanged Response.Cookies.Add(New HttpCookie("backcolor", CType(sender, DropDownList).SelectedItem.Value)) End Sub 6. Open the FriendsBase.vb file. As we discussed earlier, you need to add the controls to the hierarchy on the Init phase, meaning you will need to override the OnInit() method. You ll do this, and also keep a reference to the loaded controls, as you ll work with them further at rendering time. For that purpose, let s modify the class code as follows: Public Class FriendsBase Inherits Page Protected HeaderMessage As String = "" Protected HeaderIconImageUrl As String = "" Private _footer As FriendsFooter Private _header As FriendsHeader Private _subheader As SubHeader Protected Overloads Overrides Sub OnInit(ByVal e As EventArgs) _header = CType(LoadControl("~/Controls/FriendsHeader.ascx"), FriendsHeader) _footer = CType(LoadControl("~/Controls/FriendsFooter.ascx"), FriendsFooter) _subheader = New SubHeader ' Add to the Controls hierarchy to get proper ' event handling, on rendering we reposition them Page.Controls.Add(_header) Page.Controls.Add(_subheader) Page.Controls.Add(_footer) MyBase.OnInit(e) End Sub

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The important thing with attaching event receivers like we just saw is to notice that there is no way to bind a receiver to a content type, only to a list template. No, there are no ways to add receivers to individual lists either. However, as you saw in 6, you can programmatically add event receivers using code. You can use the same technique to add event receivers to a content type as well, but there should be a way to do this using CAML in a feature. After all, that is where you define the content type, as you will see later in the chapter. The answer Event receivers in content types are defined in a different section of the elements file.

7. You also need to import this namespace: Imports System.Web.UI.HtmlControls 8. The code for the Render() method will look different now, as you just need to rearrange the controls you initialized in OnInit() and place them in their final location inside the form Controls hierarchy: Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter) ' Remove the controls from their current place in the hierarchy Page.Controls.Remove(_header) Page.Controls.Remove(_subheader) Page.Controls.Remove(_footer) ' Get a reference to the form control Dim form As HtmlForm = CType(Page.Controls(1), HtmlForm) ' Reposition the controls on the page form.Controls.AddAt(0, _header) form.Controls.AddAt(1, _subheader) form.Controls.AddAt(form.Controls.Count, _footer) ' Set current values _header.Message = HeaderMessage _header.IconImageUrl = HeaderIconImageUrl ' New cookies are set to Response by the color selector Dim bg As String = Response.Cookies("backcolor").Value ' If not, check Request for a previously saved cookie If bg Is Nothing AndAlso Not Request.Cookies("backcolor") Is Nothing AndAlso Not Request.Cookies("backcolor").Value Is Nothing AndAlso Not Request.Cookies("backcolor").Value = String.Empty Then bg = Request.Cookies("backcolor").Value ' Preserve cookie in the response Response.Cookies.Add(Request.Cookies("backcolor")) End If ' Do we have a value to work with If Not bg Is Nothing AndAlso bg <> String.Empty Then ' Enclose form in a DIV to display the backcolor Dim div As HtmlGenericControl = New HtmlGenericControl("div") div.Style.Add("background-color", bg) ' Relocate the form inside the DIV Page.Controls.Remove(form) Page.Controls.AddAt(1, div) div.Controls.Add(form) End If

' Render as usual MyBase.Render(writer) End Sub 9. That s it! Save and run the page. Try clicking the new icon next to the visitor count and selecting a color from the combo box.

Again, you can look to XmlDocuments and the third built-in XmlDocument type Receiver. The Receiver XmlDocument resides in the http://schemas.microsoft.com/sharepoint/events namespace. If you want to see a Receiver XmlDocument in your default SharePoint installation, search the ctypeswss.xml file for the content type 0x010107, the DocumentWorkflowItem: <XmlDocument NamespaceURI="http://schemas.microsoft.com/sharepoint/events"> <spe:Receivers xmlns:spe="http://schemas.microsoft.com/sharepoint/events"> <Receiver> <Name>Workflow Library Item Added</Name> <Type>ItemAdded</Type> <SequenceNumber>1</SequenceNumber> <Assembly>Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c</Assembly> <Class>Microsoft.SharePoint.Workflow.SPWorkflowLibraryEventReceiver</Class> <Data /> <Filter /> </Receiver> (snipped for space-saving purposes </Receivers> </XmlDocument>

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