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The first three arguments of each of these specify the control property, the data source, and the source property this defines what information the binding connects. The true argument that follows says it s OK for binding to format the data if necessary. These arguments just do the same thing Visual Studio did for us previously. The final argument is the interesting one. We re saying we want the binding to refresh anytime the property changes, rather than the default setting of waiting until either the focus moves or something else means we can t wait any longer (e.g., different data is about to be loaded). With this in place, changes to either the title or the due date will show up immediately in the list view. So we now have some controls that present the data, and in the case of the text boxes and date picker, which will also modify the data. The next job is to make those buttons do something.

To respond to user input in Windows Forms applications, we can just use ordinary C# event handling user interface elements are all represented as objects, and they raise events in the usual way whenever anything interesting happens. As you already saw with the binding source change notifications, Visual Studio can generate the eventhandling code for us.

If your organization has applied for an official domain name and wants to have its own primary name server that will answer queries instead of a third party, you will need to deploy a master name server. In this section, we will assume that your organization applied for the domain name pvctoyfan.com at a domain registrar and we will set up a machine to host it. Our master name server also has other servers that it needs to resolve, such as FTP and web servers, as well as another name server. These three machines have the IP addresses 192.168.1.7, 192.168.1.8, and 192.168.1.9. 1. Add the entry shown in Listing 11-15 to the named.conf file in /var/named/chroot/etc.

Controls define a default event, usually the event you are most likely to want to handle for the control in question. So we can handle the Click events of the two buttons by double-clicking on them in the designer. Visual Studio will add event handler methods with suitable names and signatures, and will add the code to handle the event in the generated part of the partial class. We simply need to provide the code. The New button handler is pretty straightforward, because we already wrote the code to add a new item:

private void newButton_Click(object sender, EventArgs e) { CreateNewItem(); }

Deletion is slightly more involved:

Listing 11-15. The zone Statement for the pvctoyfan.com Domain zone "pvctoyfan.com" { type master; file "db.pvctoyfan.com";

private void deleteButton_Click(object sender, EventArgs e) { if (entriesListView.SelectedIndices.Count != 0) { int entryIndex = entriesListView.SelectedIndices[0]; entriesSource.RemoveAt(entryIndex); } }

The ListView control is able to support multiple selection. We ve disabled this, but we still have to negotiate an API designed to support it it offers a SelectedIndices collection, providing all the selected items. We just make sure it s not empty, and then use the first index. We remove the object via the binding source so that the data binding system knows what s going on, just as we did when adding a new item. (In fact, it would work if we didn t do this because this example uses a BindingList to hold the model, and that raises change notifications. Unlike AddNew, there s no particular advantage to going via the binding source here, but since we re treating the binding source as the central point through which all changes are handled, it s good to be consistent.) We can now add multiple entries. This reveals a missing piece we have done nothing yet to ensure that when the user selects an item in the list view, the corresponding entry s properties appear in the rest of the form. So we need to add a handler to the list view s SelectedIndexChanged event. That s its default event, so you can just doubleclick the list view in the form designer. Then all we need to do is set the binding source s Position property:

private void entriesListView_SelectedIndexChanged(object sender, EventArgs e) { if (entriesListView.SelectedIndices.Count != 0) { int entryIndex = entriesListView.SelectedIndices[0]; entriesSource.Position = entryIndex; } }

}; We are telling named that it is now going to host the pvctoyfan.com domain as a master name server. The zone details can be found in the db.pvctoyfan.com zone file that will be created next. 2. Create a file called db.pvctoyfan.com inside /var/named/chroot/var/named with the entries shown in Listing 11-16.

We ve had to jump through the same hoop to get the selected item index. There s really just one line of interest here the one that sets the Position.

We have to do this only because the ListView doesn t do data binding automatically. The ListBox and most data grid controls will automatically synchronize the current data binding position with the selected item.

Figure 5-19. Rule Condition Editor with Part Number condition When the Rule Condition Editor closes and you re looking at the Select Condition dialog, notice the Condition Preview shows the condition as this.StrPartNumber!=String.Empty. The Rule Condition Editor took care of cleaning up the code. While you re in the Select Condition dialog, click the Rename button. When the Rename Condition dialog appears, enter PartNumberPresent as the New name for condition, as shown in Figure 5-20. This gives the condition a more meaningful name than Condition1. Click OK after entering the name. The new name appears in the Select Condition dialog.

Listing 11-16. The Zone File for the pvctoyfan.com Domain $TTL 1D @ IN SOA ns.pvctoyfan.com. hostmaster.pvctoyfan.com. ( 1 ; Serial 3H ; Refresh 2H ; Retry 1W ; Expire 1D) ; Minimum TTL ns.pvctoyfan.com.