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The following are the main scenarios in which Solver won t run, stops before it finds a solution, or reaches a solution that doesn t seem correct to you: You cannot run Solver because of a problem when you choose Tools Solver. You cannot have Solver begin finding a solution because there is a problem with a specific Solver dialog box setting. Once you start Solver, it cannot find a solution because it has reached some predefined limit in the model, or there is simply no possible solution to the problem. Solver finds a solution that you discover is incorrect, because you defined the problem incorrectly. This section describes how to troubleshoot these main scenarios.

Instead, you simply modify the profile settings in the webconfig file As it becomes more common for websites to use the profiles features, custom profile providers will become more attractive..

Note It s also important to consider the type of data that works best in a profile. As with many other types of

This chapter explained some important routines to consider when completing your Cake projects. Remember to provide a starting point in app/config/routes.php and to create navigational methods throughout the application to improve the user experience with the blog and any of your other Cake applications. Also, don t forget to check thoroughly for bugs in the code and to alter the design of the views to fit your methods. When deploying the application to a remote host, be sure to place the Cake libraries outside the document root and to adjust the webroot/index.php file accordingly.

state management, you can store any serializable types into a profile, including simple types and custom classes.

One significant difference between profiles and other types of state management is that profiles are stored as individual records, each of which is uniquely identified by user name. This means profiles require you to use some sort of authentication system. It makes no difference what type of authentication system you use (Windows, forms, or a custom authentication system) the only requirement is that authenticated users are assigned a unique user name. That user name is used to find the matching profile record in the database.

Note Later in this chapter (in the section Anonymous Profiles ), you ll learn how the anonymous identification feature lets you temporarily store profile information for users who haven t logged in.

he best way to set up your development environment is to configure a localhost server on your computer. Let me explain what that means. When you access a web site, you re sending and requesting information from another computer through an Internet connection. That server can communicate and process the information in a plethora of possible configurations. For example, when you buy a computer, you have the option of getting a Mac or Windows-based machine. Or, if you want, you could run Linux, Unix, or even DOS. All these possibilities mean that for you, the user, the experience will depend on which operating system you choose. But let s say you want to print a document. Well, regardless of the operating system or how that operating system prints something, once the document is printed, it doesn t really matter what configuration the computer had; it s all the same to the reader of the document. The Internet is a lot like this example. The computer/server at the other end that will be processing the requests and creating output could run just about anything. But the final output will be a web page of some sort or some kind of web output. For you, the developer, the configuration will matter a great deal. In fact, it will affect everything you do to create and serve a web site.

The following are the most common error messages that Solver can display after you click Tools Solver: Active Document Is Not a Worksheet or Is Protected: This message is displayed when a protected worksheet is active when you click Tools Solver. To solve this problem, unprotect the worksheet. Cannot Do This Command in Group Edit Mode: This message is displayed if multiple worksheets are selected when you click Tools Solver. To Solve this problem, select only one worksheet.

When deciding whether to use profiles, it s natural to compare the profiles feature with the kind of custom data access code you wrote in 15 (and the database components you ll learn to build in 23). Clearly, writing your own ADO.NET code is far more flexible. It allows you to store other types of information and perform more complex business tasks. For example, an e-commerce website could realistically use profiles to maintain customer address information (with the limitations discussed in the previous section). However, you wouldn t use a profile to store information about previous orders. Not only is it far too much information to store efficiently, it s also awkward to manipulate.