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This syntax works only for WSS 2 web parts, meaning you can use it only with web parts that inherit from a class such as Microsoft.SharePoint.WebPartPages.WebPart. If you want to add WSS 3 web parts, which are nothing more than ASP.NET 2.0 web parts, you must use a different syntax. All this gets very confusing, and I can understand if you get a bit frustrated. There is a simple solution, however. You see, the code you need to add to AllUsersWebPart is the same code that resides in a .dwp file from WSS 2 or a .webpart file from WSS 3. Not only that, but if you have the web part installed, there is an easy way to get the XML from within SharePoint. Go to the web part gallery of your root site you know, the one you set up earlier in this chapter. You will see several web parts in the library, similar to Figure 4-13.

By default, each element defined by a schema must appear once (and only once) in the instance document Clearly, this is not appropriate for all cases In particular, in our example, we want to allow multiple <User> and <Attended> elements in a single XML document By contrast, some of the fields in our database are optional, and they won t always have values For instance, the MonthIn and MonthOut fields of the TimeLapse table can be null You can cater to requirements like these through the minOccurs and maxOccurs attributes of XSD elements, as you ll see now Try It Out: Set Minimum and Maximum Occurrences We ll use this example to set up the rules we just described: you ll allow multiple instances of the <User> and <Attended> elements and force the presence of the PlaceID and ID attributes 1 We support uploading multiple users in a single document.

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7. The next step is to implement code with the DropDownList you added so that at runtime you can edit the layout of the Web Parts. Therefore, click on the Design view of the Default.aspx page, and double-click on the page to switch over to the code view. Here you will add the following code to the _Default class: Partial Class _Default Inherits System.Web.UI.Page Dim _wpmmngr As WebPartManager Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init _wpmmngr = WebPartManager.GetCurrentWebPartManager(Page) Dim browseModeName As String = _WebPartManager.BrowseDisplayMode.Name ' Populate the drop-down list with the names of supported display modes. Dim displaymode As WebPartDisplayMode For Each displaymode In _wpmmngr.SupportedDisplayModes Dim modeName As String = displaymode.Name ' Ensure a mode is enabled before adding it. If displaymode.IsEnabled(_wpmmngr) Then Dim item As New ListItem(modeName, modeName) DropDownList1.Items.Add(item) End If Next displaymode End Sub Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged Dim dropdownSelectedMode As String = DropDownList1.SelectedValue Dim md As WebPartDisplayMode = _ _wpmmngr.SupportedDisplayModes(dropdownSelectedMode) If Not (md Is Nothing) Then _wpmmngr.DisplayMode = md End If End Sub End Class

However, at least one user should be present, or there would be no purpose in the upload! Select the User element of the Friends element in the designer, and open its Properties browser Set the maxOccurs property to unbounded The minOccurs default of 1 is appropriate in this case 2 Each user may attend any number of courses in a single institution On the other hand, the user may still be in the middle of a first course (no YearOut yet) So, the Attended element should be optional and allow multiple occurrences Select the Attended element inside the User element in the designer and open its Properties browser Set the maxOccurs property to unbounded, and set the minOccurs property to 0 3 Select the PlaceID attribute of the Friends element.

Figure 4-13. Web Part Gallery Click the Edit icon, and you will get the properties for the web part, as shown in Figure 4-14.

Set its use property to required (which means that this attribute must be set on the <Friends> element of instance documents) You will need this attribute to know which institution is uploading users 4 Repeat step 3 for the ID attribute of the User element 5 Select the DateOfBirth element of the User element Set its minOccurs property to 0 Leave maxOccurs at the default setting 6 Repeat step 3 for the CellNumber element of the User element 7 Repeat step 3 for three elements of the Attendee element: MonthIn, MonthOut, and Notes 8 Save the file..

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