vb.net code 39 generator source Properties of the WebPart Class in .NET framework

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Properties of the WebPart Class
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Description Indicates whether a Web part can be removed from the page. Indicates whether a Web part allows you to edit its properties. Indicates whether a Web part can be hidden on a Web page. Indicates whether a Web part can be minimized. Indicates whether a Web part can be moved within its zone only or between zones. Indicates the caption of the Web part. Indicates the state of the Web part: normal or minimized. Indicates the type of the frame for the Web part: border, title, title and border, or none. The Web part description used in the catalog and as a ToolTip in the title bar. Indicates the direction of the text: left-to-right or right-toleft. Indicates which kind of Help user interface is displayed for a control. The URL to a topic in the Web part s help.
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Property AllowClose AllowEdit AllowHide AllowMinimize AllowZoneChange Caption ChromeState ChromeType Description Direction HelpMode HelpUrl
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3 Working with Web Parts
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Table 3-2 Properties of the WebPart Class
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Property Hidden IsShared ProviderConnectionPoints
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Description Indicates whether the Web part is displayed on a Web page. Indicates whether multiple users share the Web part. Gets the collection of ConnectionPoint objects that are associated with the Web part. The ConnectionPoint class defines a possible connection in which the Web part is either the provider or the consumer. Indicates the string used as the first string in the title of a Web part. (See the description of the Caption property.) A style object used to render the title bar of the Web part. Indicates the URL where you can access additional information about the Web part control. If specified, the URL appears in the title bar of the part. The set of verbs associated with the Web part. The zone that currently contains the Web part. ID of the zone that currently contains the Web part. The index of the Web part in the zone it lives in.
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Title TitleStyle TitleUrl
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Verbs Zone ZoneID ZoneIndex
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The programming interface of the WebPart class is all in the properties listed in the table. The class has no methods and events, aside from those inherited from base server controls.
A Sample Web Part Component
Let s build a sample Web part and experiment with its properties. As mentioned, a Web part is a pseudo-window nested in the Web page that contains some sort of information. Like a window, it can be moved around and its content can be configured to some extent. The Web Parts infrastructure provides drag-and-drop facilities for moving the control around and changing the page layout. The programmer is responsible for building any logic and user interface elements for editing and cataloging the content. The primary goal of a Web part control is delivering information to users. The information can be retrieved in a variety of ways, according to the characteristics of both the Web part and the hosting application. In a portal scenario, the Web part shows through the user s personalized page some content grabbed over the Web and possibly provided by external Web sites.
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Part I ASP.NET Essentials
The BookFinder Web Part
The sample Web part we ll build grabs information about books and authors using a given search engine. You can use the Google or the Amazon API, or you can write your own engine that searches a local or remote database. In this example, I simply want to get information about books written by a certain author. All I need is the author s name. A call to the search engine consists of the following code:
private string _dataSource; _dataSource = SearchEngine.DownloadData(author);
The SearchEngine class can internally use any search technology you like, as long as it returns an XML string. It goes without saying that the XML schema is totally arbitrary. In the next example, the XML string is transformed in a DataSet object and used to populate a Repeater control. The Web Parts component is wrapped into a user control. The body of the user control looks like the following:
<div style="overflow:auto;height:280px;margin:3;"> <asp:TextBox runat="server id="AuthorName Text="Dino Esposito /> <asp:button runat="server id="btnGo Text="Go onclick="OnSearch /> <asp:repeater runat="server id="Presenter"> <headertemplate> <table style="font-family:Verdana;font-size:8pt;"> </headertemplate> <itemtemplate> <tr> <td><img src= <%# Eval( ImageUrlSmall ) %> /> </td> <td><b><a href= <%# Eval( Url ) %> ><%# Eval( ProductName ) %> </a></b><br /> <i><%# Eval( Manufacturer ) %></i><br /> <%# Eval( ReleaseDate ) %><br /></td> </tr> </itemtemplate> <footertemplate> </table> </footertemplate> </asp:repeater> </div>
The data-bound expressions used in the code use the new Eval keyword a more compact replacement for the DataBinder.Eval method used in ASP.NET 1.x. We ll cover Eval in detail in 5.
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