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As you ve already learned, you can create a GridView that shows all your fields by setting the AutoGenerateColumns property to True. Unfortunately, when you use this approach you lose the ability to control any of the details over your columns, including their order, formatting, sorting, and so on. To configure these details, you need to set AutoGenerateColumns to False and define your columns explicitly. This requires more work, and it s a bit tedious. However, there is a nifty trick that solves this problem. You can use explicit columns but get Visual Studio to create the column tags for you automatically. Here s how it works: select the GridView control, and click Refresh Schema in the smart tag. At this point, Visual Studio will retrieve the basic schema information from your data source (for example, the names and data type of each column) and then add one <BoundField> element for each field.

Tip If you modify the data source so it returns a different set of columns, you can regenerate the GridView columns. Just select the GridView, and click the Refresh Schema link in the smart tag. This step will wipe out any custom columns you ve added (such as editing controls).

Storing information in the cookie is simple with the write() function and is similar to the Session->write() function. The first value in the function is the cookie s key, and the second contains the value to be written. Remember that this value will be encrypted using the cookieKey preference. $this->Cookie->write('User',$user_agent);

Once you ve created your columns, you can also use some helpful design-time support to configure the properties of each column (rather than editing the column tag by hand). To do this, select the GridView, and click the ellipsis ( . . . ) next to the Columns property in the Properties window. You ll see a Fields dialog box that lets you add, remove, and refine your columns (see Figure 17-2).

Figure 17-2. Configuring columns in Visual Studio Now that you understand the underpinnings of the GridView, you ve still only started to explore its higher-level features. In the following sections, you ll tackle these topics: Formatting: How to format rows and data values Selecting: How to let users select a row in the GridView and respond accordingly Editing: How to let users commit record updates, inserts, and deletes Sorting: How to dynamically reorder the GridView in response to clicks on a column header Paging: How to divide a large result set into multiple pages of data Templates: How to take complete control of designing, formatting, and editing by defining templates

Just like the Session component, reading a cookie is done with the read() function: $user = $this->Cookie->read('User'); As long as the cookie hasn t expired, the information should be available.

Formatting consists of several related tasks. First, you want to ensure that dates, currencies, and other number values are presented in the appropriate way. You handle this job with the DataFormatString property. Next, you ll want to apply the perfect mix of colors, fonts, borders, and alignment options to each aspect of the grid, from headers to data items. The GridView supports these features through styles. Finally, you can intercept events, examine row data,

and apply formatting to specific values programmatically. In the following sections, you ll consider each of these techniques. The GridView also exposes several self-explanatory formatting properties that aren t covered here. These include GridLines (for adding or hiding table borders), CellPadding and CellSpacing (for controlling the overall spacing between cells), and Caption and CaptionAlign (for adding a title to the top of the grid).

If you want to store a workbook s models in a central location, in step 5 of the preceding procedure, you can save all worksheets models on a single worksheet separate from the worksheets containing the target and changing cells. If you do store a worksheet model on a workbook separate from the originating worksheet, you may want to add a brief note or comment about this near the stored model for future reference. Solver stores the model s target cell, adjustable cells, constraints, and other option settings in a vertical column of cells, beginning with the cell specified in the Save Model dialog box. For example, look at the model stored in the worksheet shown in Figure 4-8.

Tip Want to create a GridView that scrolls inside a web page It s easy. Just place the GridView inside

Delete cookies using the del() function. Supply the name of the cookie to be deleted, and the component will eliminate the cookie for you: $this->Cookie->del('User');

a Panel control, set the appropriate size for the panel, and set the Panel.Scrollbars property to Auto, Vertical, or Both.