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is always one. (The NumInst call necessarily invokes the service.) Setting the /state switch enables cookies causing the correct count to be returned. This essentially emulates remoting s client-activated behavior which we explored in the previous chapter. 6.7.4 Example: logging into a Web service You could use the stateful approach to provide application-level login/logout for a service. Listing 6.10 presents a StringCaseService service which requires the client to login in order to call the ToUpper and ToLower Web methods. In contrast, the GetLength method can be executed without logging in.

If you make a change to a document and want to repeat that change elsewhere, you can click the Repeat button on the Quick Access Toolbar. If the last task you performed was to undo an action, the Repeat button is replaced by the Redo button. So if you change your mind about whatever you undid, you can click the Redo button to return the text to its previous state. You can t redo multiple actions by clicking them in a list as you can with the Undo button, but you can click the Redo button repeatedly until the text is restored to what you want. In this exercise, you ll edit the text in a document. You ll insert and delete text, undo the deletion, copy and paste a phrase, and move a paragraph. SET UP You need the Orientation_start document located in your 03 practice file folder to complete this exercise. Open the Orientation_start document, and save it as Orientation. Then follow the steps.

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If your question is about one of the programs in the Microsoft Office Home and Student 2010 software suite, and not about the content of this book, your first recourse is the Help system for the individual program. This system is a combination of tools and files stored on your computer when you installed the software suite or program and, if your computer is connected to the Internet, information available from the Microsoft Office Online Web site. You can find Help information in the following ways:

<%@ WebService Language="C#" Class="StringCaseService" %> // file: // description: // stringcaseservice.asmx A web service to change string case. Requires user to login first.

To find out about an item on the screen, you can display a ScreenTip. For example,

And here s a listing of the code that is in the edit pane of EffectEdit:

to display a ScreenTip for a button, point to the button without clicking it. The ScreenTip gives the button s name, the associated keyboard shortcut if there is one, and a description of what the button does when you click it.

using System.Web.Services; using System.Security; [WebService( Description="A web service to change case. Requires login.", Namespace="http://manning.com/dotnet/webservices" )] public class StringCaseService : WebService { [WebMethod( Description="Login with username and password.", EnableSession= true )] public bool Login(string username, string password) { loggedIn = false; // logout existing user, if any if (username == "jbloggs" && password == "secret") loggedIn = true; return loggedIn; } [WebMethod( Description="Logout.", EnableSession= true )] public void Logout() { loggedIn = false; // logout existing user } [WebMethod( Description="Uppercase a string. Must be logged in to call.", EnableSession= true )] public string ToUpper(string s) { requireLogin();

After opening a dialog box, you can click the Help button (also a question mark)

return s.ToUpper(); } [WebMethod( Description="Lowercase a string. Must be logged in to call.", EnableSession= true )] public string ToLower(string s) { requireLogin(); return s.ToLower(); } [WebMethod( Description="Return string length." )] public int GetLength(string s) { // login not necessary... return s.Length; } private void requireLogin() { if (!loggedIn) throw new SecurityException("Client not logged in!"); } private bool loggedIn { get { if (Session["loggedIn"] == null) return false; return (bool) Session["loggedIn"]; } set { Session["loggedIn"] = value; } } }

at the right end of the dialog box title bar to display the program-specific Help window. Sometimes, topics related to the functions of that dialog box are already identified in the window.

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