Microsoft Sharepoint Products and Technologies Resource Kit eBook

Chapter 33: The Windows SharePoint Services Object Model 937
Note When performing global administration operations, you will need a different
control for performing security validation: the AdminFormDigest control.
To add a FormDigest Control to a Web Application
This procedure shows how to add a FormDigest control to the Visual Studio .NET
toolbox and add it to a Web form.
1. Open your Web application in Visual Studio.NET.
2. Go to the design view of a Web form, right-click the toolbox, and select
Add/Remove Items.
3. In the Customize Toolbox dialog, click Browse.
4. Browse to the Microsoft.SharePoint.dll, which is located by default in
:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\60\ISAPI\Microsoft.SharePoint.dll. Click Open.
5. Under the .NET Framework Components tab, locate FormDigest, select the check
box, and click OK.
6. Now you will find the FormDigest control added to the toolbox. Drag the
FormDigest control on the Web form.
If you switch to HTML view, you will notice a new page directive which
registers the FormDigest control to the page.
You will also notice a FormDigest control which is included in the form.
Now you are ready to make posts from the Web application to modify the
contents of the content database.
Adding a FormDigest Control Programmatically
You can also add a FormDigest control programmatically. This example shows how
to add a FormDigest control to a Web Part. The first step is to create a new instance
of the FormDigest control. Next you should call the Render method of the Form-
Digest control to send the content of the control to an HtmlTextWriter object, which
is responsible for writing the content that is rendered on the client. The following
code can be copied into the RenderWebPart method of your Web Part:
FormDigest myDigest = new FormDigest();
myDigest.RenderControl(output);