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The consumer WebPart retrieves information from the provider WebParts for its own purposes. In this example, you just display the text for the currently selected note in the CustomerNotesPart that you have implemented as the provider. Because this solution does not contain this WebPart yet, you have to start from scratch. Just add a new class that inherits from WebPart. The WebPart uses the CreateChildControls for creating a label that displays the date, a text box that displays the notes text, and a button that updates the notes text.

If you want to use these compilers manually, you can invoke them from the command line. You ll find all of them in c:\[WinDir]\Microsoft.NET\[Version], where WinDir is the directory of the operating system (like c:\Windows) and Version is the version number of .NET you ve installed, like v2.0.50215. However, using the .NET compilers is awkward because you need to specify the files you want to compile and the other .NET assemblies they use. You also need to compile your entire application at once or compile each web page separately. To avoid these headaches, most developers rely on ASP.NET s built-in support for compiling pages.

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Public Class CustomerNotesConsumer Inherits WebPart Private NotesTextLabel As Label Private NotesContentText As TextBox Private UpdateNotesContent As Button Protected Overrides Sub CreateChildControls() NotesTextLabel = New Label() NotesTextLabel.Text = DateTime.Now.ToString() NotesContentText = New TextBox() NotesContentText.TextMode = TextBoxMode.MultiLine NotesContentText.Rows = 5 NotesContentText.Columns = 20 UpdateNotesContent = New Button() UpdateNotesContent.Text = "Update" AddHandler UpdateNotesContent.Click, AddressOf UpdateNotesContent_Click Controls.Add(NotesTextLabel) Controls.Add(NotesContentText) Controls.Add(UpdateNotesContent) End Sub End Class Next, you have to add a simple method that is called by the ASP.NET WebParts framework automatically if the WebPart is connected to another WebPart. This method accepts the other connection point (which is the provider) as a parameter and needs to be marked with the <ConnectionConsumer> attribute so that the runtime knows this is the method to be called for passing in the provider. Private _NotesProvider As INotesContract = Nothing <ConnectionConsumer("Customer Notes")> _ Public Sub InitializeProvider(ByVal provider As INotesContract) _NotesProvider = provider End Sub With the provider initialized, the WebPart of course can consume information from the provider by just calling properties (or methods) defined in the communication contract. For example, in the PreRender event you can initialize your controls, whereas in the button s event procedure you can update the notes content by setting the Notes property appropriately: Private Sub UpdateNotesContent_Click(ByVal sender As Object, ByVal e As EventArgs) If _NotesProvider IsNot Nothing Then _NotesProvider.Notes = NotesContentText.Text End If End Sub Protected Overrides Sub OnPreRender(ByVal e As EventArgs) ' Don't forget to call base implementation MyBase.OnPreRender(e) ' Initialize control If _NotesProvider IsNot Nothing Then NotesContentText.Text = _NotesProvider.Notes

a <map> tag. You define regions by adding HotSpot objects to the ImageMap.HotSpots collection, and each region is rendered as an <area> tag inside the <map> tag. Just before the <map> tag, ASP .NET renders the linked <img> tag that shows the picture and uses the image map. For example, if you create a map named ImageMap1 with three circular hotspots, the ImageMap control will render markup like this: <img id="ImageMap1" src="cds.jpg" usemap="#ImageMapImageMap1" style="border-width:0px;" /> <map name="ImageMapImageMap1"> <area shape="circle" coords="272,83,83" href="javascript:__doPostBack('ImageMap1','0')" title="DVDs" alt="DVDs" /> <area shape="circle" coords="217,221,83" href="javascript:__doPostBack('ImageMap1','1')" title="Media" alt="Media" /> <area shape="circle" coords="92,173,83" href="javascript:__doPostBack('ImageMap1','2')" title="CDs" alt="CDs" /> </map>

custom web part from scratch, you can define properties on the class that are stored in the personalization store. By doing this you can specify whether personalization happens on a per-user basis or is shared across authenticated users. You will learn how to do this in the next section.

NotesTextLabel.Text = _NotesProvider.SubmittedDate. ToShortDateString () End If End Sub Of course, you have to validate whether the provider has been initialized. If it hasn t been, the WebPart is not connected with any other WebPart, and therefore you cannot access any information. However, with this code in place you are basically finished. You have created a consumer WebPart and a provider WebPart, and communication between those two takes place through the communication contract interface. Next you can connect these WebParts either manually or dynamically at runtime.

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