free visual basic qr code generator The statement on line 13 establishes MsgLoad as an onLoad event handler for the in Visual Studio .NET

Printer Code 128 Code Set A in Visual Studio .NET The statement on line 13 establishes MsgLoad as an onLoad event handler for the

The statement on line 13 establishes MsgLoad as an onLoad event handler for the
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prgMsg object. This means that the MsgLoad method on line 3 will run as soon as the prgMsg object finishes loading.
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The EnsureChildControls method on line 7 ensures that the CreateChildControls
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The assignment statement on line 8 stores a value into the paragraph control created
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on line 12.
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The declaration of the prgMsg variable appears on line 1, which is outside both the
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MsgLoad method and the CreateChildControls method. This makes the prgMsg available within both of those methods. This, by the way, plus the Web Part templates for Visual Studio .NET, is just about all the code you need to write an elementary Web Part. A Visual Studio project using this code appears in the \WebParts\proseware folder of the companion CD, and a screen shot appears in Figure 19-4.
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method has finished executing. If not, it waits for that method to complete. This avoids the embarrassing moments that occur when a method tries to manipulate an object that CreateChildControls hasn t created yet.
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In this code:
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The second statement, however, could easily reside in the method that determines the value of the strMsg variable. Here s an example:
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Part VII: Developing Web Parts in Visual Studio .NET
Microsoft Windows SharePoint Services Inside Out
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F19wss04.bmp
Figure 19-4.
This is a very simple Web Part, and it required very little code.
Manipulating SharePoint Objects
Windows SharePoint Services provides a rich collection of objects for working with sites, lists, permissions, and other administrative objects. All these objects reside within a namespace named, logically enough, SharePoint. Its major classes include:
SharePoint.SPSite
Represents a SharePoint site collection. Its properties and methods provide access to the collection s subsites, templates, cross-site groups, and so forth. Remember: an SPSite object doesn t represent a site. Its properties and methods pertain to an entire site collection, and not to any one Web site.
SharePoint SPWeb
Represents an individual SharePoint site: either a top-level Web site or a subsite. It provides access to all the site s lists, files, folders, Web Parts, and other objects. Represents a SharePoint list. The term list, in this context, is very broad. It includes not only generic lists, but also surveys, discussion boards, document libraries, picture libraries, and form libraries.
SharePoint.SPList
For a complete listing and description of the objects in the SharePoint namespace, browse http://msdn.microsoft.com/library/en-us/spptsdk/html/tsnsmicrosoftsharepoint.asp.
Part VII: Developing Web Parts in Visual Studio .NET
Beginning Web Part Development The statement below creates an SPWeb object named spwCurr that describes the current SharePoint Web site. In other words, it describes the site that contains the page that displayed the Web Part.
SPWeb spwCurr = SPControl.GetContextWeb(Context);
The next statement creates an SPSite object named spsColl that describes the site collection that contains the current site.
SPSite spsColl = SPControl.GetContextSite(Context);
Once you have these objects, you can retrieve more information about the site or its collction by using their properties and methods. For example, after you create an SPWeb object named spwCurr as described above:
spwCurr.CurrentUser.LoginName
Returns the current team member s login name,
such as interlacken\karen.
spwCurr.CurrentUser.Name
Returns the current team member s personal name,
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such as Karen Archer.
spwCurr.Name spwCurr.Lists spwCurr.Delete()
Gets or sets the name of the current site. Returns a collection of SPList objects, one for each list in the site. Deletes the current site.
To enumerate a collection, code a foreach loop like the one below:
foreach (SPList splCurr in spwCurr.Lists){ // splCurr will point to a different list during each iteration }
SPList splNrTwo = spwCurr.Lists[1];
And this statement creates an SPList object that points to a Shared Documents library:
SPList splSharedDocs = spwCurr.Lists["Shared Documents"];
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In addition, you can index into lists using either numbers or names. The following statement, for example, creates a SPList object named splNrTwo that points to the second list in the spwCurr.Lists collection:
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In most cases, if a property is editable, your code can simply store a value into it. Editable, in this sense, means that Windows SharePoint Services permits direct updates to a field, and that the current user has permission to perform the operation.
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Part VII: Developing Web Parts in Visual Studio .NET
Microsoft Windows SharePoint Services Inside Out To add objects to and remove them from SharePoint collections, you use Add and Delete methods, just as you do with most other .NET collections. The following statement, for example, creates a new Contacts list named Swamp Dwellers. The second parameter supplies the list description:
spwCurr.Lists.Add("Swamp Dwellers", "Ducks, Frogs, Gators, and other creepy critters", SPListTemplateType.Contacts);
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