Custom Object used with Profile Object

[a]

I have a custom object that inherits from CollectionBase and it does not
successfully bind to GridViews or DropdownLists. My understanding is that
that is because GridViews and Dropdownlists implement IEnumerable, therefore,
if I want my custom object to bind to the gridview or the dropdownlist, I
need to inherit from IEnumerable also, right?

Whatever the answer is, I'm trying to learn what I need to do to get my
custom object to bind to a gridview and a dropdownlist.

I don't think this has anything to do with it, but I'm setting the value of
a Profile object (ASP.NET 2.0) equal to the custom object.

School.Teachers tlTeachers = new School.Teachers();

tlTeachers.Add(new School.Teacher("Buck"));

Profile.Teachers = tlTeachers;

Code like this works:

Label1.Text = Profile.Teachers.Count.ToString(); // The number of items in
the profile object

Label1.Text = Profile.Teachers[1].FirstName.ToString();// The value of an
item at a particular index position

But this does not:

GridView1.DataSource = Profile["Teachers"]; // Populate the GridView1 from
the Profile Object

GridView1.DataBind();