The key to this example is the following ListAssemblies method.

// List the assemblies.
private void ListAssemblies()
{
    lblNumAssemblies.Text = "";
    lstAssemblies.Items.Clear();
    Cursor = Cursors.WaitCursor;
    Refresh();

    foreach (Assembly assembly in
        AppDomain.CurrentDomain.GetAssemblies())
    {
        lstAssemblies.Items.Add(assembly.GetName().Name);
    }

    // Display the number of assemblies.
    lblNumAssemblies.Text =
        lstAssemblies.Items.Count.ToString() + " assemblies";
    Cursor = Cursors.Default;
}

This code loops over the Assembly objects returned by a call to AppDomain.CurrentDomain.GetAssemblies(). The program calls each Assembly's GetName method to get an AssemblyName object. It displays the value of that object's Name property in the ListBox.