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We ll build a simple application for showing and editing a to-do list. To create a new Windows Forms application, open the New Project dialog (Ctrl-Shift-N) and in the Installed Templates on the left, select Visual C# Windows. In the templates in the middle, select Windows Forms Application. We ll call our project ToDoList. Visual Studio will create a new project with a single form called Form1 a class derived from the Form base class. A Form is just a window the name reflects the fact that one of the tasks Windows Forms is particularly well suited to is making line-of-business applications that involve filling in forms. Visual Studio will be showing the empty form in a design view that you can drag controls onto. However, before we start adding the UI, we re going to define a class to represent the to-do items in our application. So we ll add a new class called ToDoEntry to the project, shown in Example 22-1.

public class ToDoEntry { public string Title { get; set; } public string Description { get; set; } public DateTime DueDate { get; set; } }

# comment attribute=value : attribute=value Where [repositoryname] is the name of the repository that YUM can use to reference additional repositories. You have to enclose the name in square brackets to let YUM know about that repository. You can alter the configuration of the repository file by specifying an attribute and its new value. Lines are terminated by carriage returns, and you can add notes by using comment markers, the hash symbol. There are two repository files included in your base install of CentOS, and they are located in the /etc/yum directory. The repository files are CentOS Base.repo and CentOS Media.repo; they contain source files for the mirror websites and DVD or CD that contains packages. Open the CentOS Media.repo file using a text editor and you will see the contents shown in Listing 7-7. Listing 7-7. One of the Included Repository Files in CentOS [c5 media] name=CentOS $releasever Media baseurl=file:///media/CentOS/ file:///media/cdrom/ file:///media/cdrecorder/ gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm gpg/RPM GPG KEY CentOS 5 In Listing 7-7, you can see that the name of the repository is [c5 media] and it contains five attributes. The name attribute holds the human-readable name of this repository and is required. You can also use repository variables, such as $releasever, that will be replaced by the actual value when YUM uses this repository. This will inform the user about what the repository contains.

If you re following this in Visual Studio, make sure you build your project after adding this class. We re going to be using some design-time features of Visual Studio that will need to know about your class, and you need to have built the project for these to work.

Next, we need to make sure Windows Forms knows we re using this class as a data source, which we ll do by creating a binding source.

The BindingSource class keeps track of how a Windows Forms UI is using a particular data source. When you have a collection of items, such as the entries in our to-do list, the BindingSource tracks which item is currently selected and can coordinate additions, deletions, and changes. Using a BindingSource can also make life easier in the UI designer, because it provides Visual Studio with information about the data you re working with so that it can help connect that data to your controls. We add a BindingSource by going back to the design view of Form1, making sure Visual Studio s Toolbox is open (which you can do from the View menu if it s not already visible), and then expanding the Data section of the Toolbox. This section contains a BindingSource item, which we drag onto the form.

Note: Repository variables always start with the $ symbol. You can find out more about them in the yum man

Utility components that aren t visible at runtime, such as timers or data sources, don t appear on the form itself at design time. A panel at the bottom of the design view, outside the form, contains all such nonvisual components.

Visual Studio picks a nondescript name bindingSource1. We can change this by selecting the item and then going to the Properties panel we ll set its (Name) property to entriesSource. Next we need to tell it what we re using as a data source. The Properties panel will show a DataSource property for the BindingSource, and if you expand its drop down, a pop up showing available data sources in the project will appear, as Figure 22-1 shows. There are none right now, so we need to click on the Add Project Data Source link at the bottom.