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By default, paging and selection don t play nicely together. If you enable both for the GridView, you ll notice that the same row position remains selected as you move from one page to another. For example, if you select the first row on the first page and then move to the second page, the first row on the second page will become selected. To fix this quirk, set the GridView.EnablePersistedSelection property to true. Now, as you move from one page to another, the selection will automatically be removed from the GridView (and the SelectedIndex property will be set to -1). But if you move back to the page that held the originally selected row, that row will be re-selected. This behavior is intuitive, and it neatly ensures that your code won t be confused by a selected row that isn t currently visible.

Tip It s possible to have AutoGenerateColumns set to True and define columns in the <Columns> section.

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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 23.

In this case, the columns you explicitly define are added before the autogenerated columns. However, for the most flexibility, you ll usually want to explicitly define every column.

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 want 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>

It is often advantageous to log exceptions to a file for later review. You can accomplish this in either of two ways: Create a custom exception base class for your application. Define an uncaught exception handler. Let s look at both techniques.

Each column can be any of several column types, as described in Table 17-1. The order of your column tags determines the left-to-right order of columns in the GridView.

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.

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