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The next step is to add the field for the Event date. I will follow the same process that I used to create the Event Location field by entering Event Date and Time as the label and event_date_time as the fieldname, and selecting Datetime as the type of data to store and Text Field with Date Pop-up calendar as the widget that will appear on the screen. Clicking the Save button reveals the Field Settings page for a date field, as shown in Figure 8-6. I will leave all of the default settings with the exception of Time zone handling which I ll set to No time zone conversion. The time entered by the author is the time that I want to have displayed on the site.

Figure 23-29. The completed application Here are some key takeaways from this preceding example: The context remains allocated throughout the application. The call to context.Inventories executes SQL to fetch all rows from the Inventory table into memory. The context tracks dirty entities, so it knows what SQL to execute upon SaveChanges(). After SaveChanges(), the entities are considered clean again.

That wraps up this chapter s examination of the ADO.NET Entity Framework. While there is so much more to this programming model than this chapter can address, you should now have a solid understanding about what problems EF attempts to solve and how to work with the overall programming model. Be sure to consult the .NET Framework 4.0 SDK documentation for more details of this slick data programming API.

Figure 8-6. The Field Settings page for the Event Date and Time field After clicking the Save field settings button, the Event settings page is displayed for the Event Date field. On this page, I have the ability to override the label that I entered previously, select whether the field is required (date and time are required for an event for my site), help text that will be displayed below the field, the default display, which is the date format set in the date module, the default value that will be used if the author doesn t select a value, the input format that defines the order and format of the date parts in the input form (e.g., 08/12/2010 08:00:00 or 12/08/2010 08:00:00 or Aug 12, 2010 08:00:00, etc.), the number of years backward and forward that will display on the pop-up calendar, and the incremental value for the minute field (if events occur on the hour, every half hour, or every quarter hour, you ll likely want to change the increment to 60, 30, or 15 respectively). You also have the ability to

Summary

This chapter wrapped up your formal investigation of database programming using ADO.NET by examining the role of the Entity Framework. EF allows you to program against a conceptual model that closely maps to your business domain. While you can reshape your entities in any way you choose, the EF runtime ensures that the changed data is mapped to the correct physical table data. You learned about the role of (and composition of) *.edmx files and how to generate them using the Visual Studio 2010 IDE. Along the way, you also learned how to map stored procedures to functions in your conceptual layer, how to apply LINQ queries to the object model, the role of Entity SQL, and how to consume fetched data at the lowest level using the EntityDataReader. You wrapped up this chapter with a simple example of binding entity classes to graphical user interfaces within the context of a Windows Forms application. You ll see other examples of binding entities to GUI applications when you examine Windows Presentation Foundation and ASP.NET.

Replace the existing file with the current file. Append an underscore and integer to make the new file name unique. Abort and return FALSE.