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Figure 8-7. Viewing event log entries in Visual Studio One of the potential problems with event logs is that old entries are automatically discarded when the event log reaches a maximum size. In Windows XP, the default log size is a stingy 0.5MB, although log entries are kept for at least 7 days even if they exceed this size limit (unless you specify otherwise). In Windows Vista, logs get a much more reasonable upper limit of 20MB (except for the new Setup log, which gets just 1MB). No matter which operating system you re using, you ll find that logs grow quickly. That means that unless you re using a custom event log that has lots of space, your log entries might not last for a long period of time. Ideally, you should use event logs to record information that is reviewed and acted on over a relatively short period of time. For example, event logs are a good choice if you plan to log application errors and review them to diagnose strange behavior immediately after it happens. Event logs don t make as much sense if you want to get a detailed picture of application activity six months later, because Windows (or someone else) may delete old log entries. In this scenario, a custom database makes more sense. If you want to add a little more breathing room to an existing log, you can change its maximum size. This is a particularly worthwhile step if you plan to use the application log in Windows XP. To do so, right-click the log and choose Properties. You ll see the Application Properties window shown in Figure 8-8, where you can change the maximum size.

connection and create the command logic in a graphical query builder. You can even test the query as you build it to make sure it returns the records you want. To launch this tool, select the data source control on the design surface of your page, and click the Configure Data Source link in the smart tag.

Tip You can increase the log size, but you really shouldn t disable automatic log deletion altogether, because

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This is enough to build the first stage of the record editor example shown earlier namely, the dropdown list box that shows all the products. All you need to do is set the DataSourceID property to point to the SqlDataSource you ve created. The easiest way to do this is using the Properties window, which provides a drop-down list of all the data sources on your current web page. At the same time, make sure you set the DataTextField and DataValueField properties. Once you make these changes, you ll wind up with a control tag like this: <asp:DropDownList ID="lstProduct" runat="server" AutoPostBack="True" DataSourceID="sourceProducts" DataTextField="ProductName" DataValueField="ProductID" /> The best part about this example is that you don t need to write any code. When you run the page, the DropDownList control asks the SqlDataSource for the data it needs. At this point, the SqlDataSource executes the query you defined, fetches the information, and binds it to the DropDownList. The whole process unfolds automatically.

As you learned earlier in this chapter, you can bind to a DataReader or a DataSet So it s worth asking which approach does the SqlDataSource control use It s actually your choice, depending on whether you set the DataSourceMode to SqlDataSourceModeDataSet (the default) or to SqlDataSourceModeDataReader The DataSet mode is almost always better, because it supports advanced sorting, filtering, and caching settings that depend on the DataSet All these features are disabled in DataReader mode However, you can use the DataReader mode with extremely large grids, because it s more memory-efficient That s because the DataReader holds only one record in memory at a time just long enough to copy the record s information to the linked control.

you could end up consuming a huge amount of space over time if information isn t being regularly removed.

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