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Second, you must specify extern statements that refer to these aliases Here is the form of extern that creates an assembly alias: extern alias assembly-name; Continuing the example, these lines must appear in your program:

Retrieve the BindingManagerBase for this data source from the Form and convert it to a CurrencyManager object. 10 If the CurrencyManager was located, refresh the bound controls. Also call EnablePhotoButtons to enable or display the Next and Prev buttons as required.

extern alias Asm1; extern alias Asm2;

Now, either version of MyClass can be accessed by qualifying it with its alias Here is a complete example that demonstrates an extern alias It contains three files The first is shown here It should be put in a file called test1cs

} if (cm != null) cm.Refresh();

using System; namespace MyNS { public class MyClass { public MyClass() { ConsoleWriteLine("Constructing from MyClass1dll"); } } }

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EnablePhotoButtons(bm);

The second file is called test2cs It is shown here:

using System; namespace MyNS { public class MyClass { public MyClass() { ConsoleWriteLine("Constructing from MyClass2dll");

The controls in the Photo tab now update properly in all cases. You can compile and run this to experience the magic. Note how the index into the album, based on the Position property, is preserved when you change albums. If the second item in an album is shown and a new album is selected, the second item in the new album is selected. What happens when the number of photos in the current album is more than the number in a newly selected album

20:

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} } }

We have not discussed the data binding for list controls very much here. As a way to see this in action, replace the txtPhotographer control with a combo box called cmbxPhotographer. Use data binding to automatically fill this list with the Photographer entries from the current album. This should be done in the OnLoad method and should look like the following:

Notice that both test1cs and test2cs define a namespace called MyNS, and that within that namespace, both files define a class called MyClass Thus, without an extern alias, no program could have access to both versions of MyClass The third file, test3cs, which is shown next, uses MyClass from both test1cs and test2cs It is able to do this because of the extern alias statements

cmbxPhotographer.DataSource = _album; cmbxPhotographer.DataMember = "Photographer";

// extern alias statements must be at the top of the file extern alias Asm1; extern alias Asm2; using System; class Demo { static void Main() { Asm1::MyNSMyClass t = new Asm1::MyNSMyClass(); Asm2::MyNSMyClass t2 = new Asm2::MyNSMyClass(); } }

Start by compiling test1cs and test2cs into DLLs This can be easily done from the command line by using these commands:

As you will see if you compile this change, all photographers assigned to the album are listed, even if they occur multiple times. Even so, this is a good example of how to populate a list quickly with values from a data source. To provide a more robust implementation, implement a GetPhotographers method in the PhotoAlbum class that returns an array of unique photographer strings in the album. This array can then be set as the DataSource for the combo box. Be careful here, as you will need to update this setting in the SaveChanges method to accommodate any changes made to the list.

Next, compile test3cs by using this command line: