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The Solver Results dialog box will display one of the following results messages when it has found a solution: Solver Found a Solution. All Constraints and Optimality Conditions Are Satisfied: This message is displayed when Solver finds a solution within the model s constraints and the Solver Options dialog box s precision setting, and when appropriate, Solver finds the target cell s maximum or minimum value. Solver Has Converged to the Current Solution. All Constraints Are Satisfied: This message is displayed when the relative change in the model s target cell is less than the Solver Options dialog box s Convergence setting for the last five trial calculations.

Enables or disables the paging of the bound records. It is False by default. Gets or sets the number of items to display on a single page of the grid. The default value is 10. Gets or sets the zero-based index of the currently displayed page, if paging is enabled. Provides a PagerSettings object that wraps a variety of formatting options for the pager controls. These options determine where the paging controls are shown and what text or images they contain. You can set these properties to fine-tune the appearance of the pager controls, or you can use the defaults.

Table 17-6. Paging Members of the GridView (Continued)

Provides a style object you can use to configure fonts, colors, and text alignment for the paging controls. Occur when one of the page selection elements is clicked, just before the PageIndex is changed (PageIndexChanging) and just after (PageIndexChanged).

When the Folder utility is instantiated, a path can be provided: $folder =& new Folder('/path/to/folder'); This utility can return an array containing the contents of this folder by using the read() function: $folder->read();

To use automatic paging, you need to set AllowPaging to True (which shows the page controls), and you need to set PageSize to determine how many rows are allowed on each page. Here s an example of a GridView control declaration that sets these properties: <asp:GridView ID="GridView1" runat="server" DataSourceID="sourceProducts" PageSize="10" AllowPaging="True" ...> ... </asp:GridView> This is enough to start using paging. Figure 17-11 shows an example with ten records per page (for a total of eight pages).

When you use paging, every time a new page is requested, the full DataSet is queried from the database. This means paging does not reduce the amount of time required to query the database. In fact, because the information is split into multiple pages and you need to repeat the query every time the user moves to a new page, the database load actually increases. However, because any given page contains only a subset of the total data, the page size is smaller and will be transmitted faster, reducing the client s wait. The end result is a more responsive and manageable page. You can use paging in certain ways without increasing the amount of work the database needs to perform. One option is to cache the entire DataSet in server memory. That way, every time the user moves to a different page, you simply need to retrieve the data from memory and rebind it, avoiding the database altogether. You ll learn how to use this technique in 24.

So far, the examples have used the GridView control to show data using separate bound columns for each field. If you want to place multiple values in the same cell, or you have the unlimited ability to customize the content in a cell by adding HTML tags and server controls, you need to use a TemplateField. The TemplateField allows you to define a completely customized template for a column. Inside the template you can add control tags, arbitrary HTML elements, and data binding expressions. You have complete freedom to arrange everything the way you want. For example, imagine you want to create a column that combines the in stock, on order, and reorder level information for a product. To accomplish this trick, you can construct an ItemTemplate like this: <asp:TemplateField HeaderText="Status"> <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /> <b>Reorder:</b> <%# Eval("ReorderLevel") %> </ItemTemplate> </asp:TemplateField>

To get an array of nested directories or trees with the files in each directory, just use the tree() function like so: $folder->tree();

If you provide a smaller value for the Convergence setting, Solver could try for a better solution; Tip

Note Your template only has access to the fields that are in the bound data object. So if you want to show

the UnitsInStock, UnitsOnOrder, and ReorderLevel fields, you need to make sure the SqlDataSource query returns this information.