/// <summary>
/// Returns the index at which the given member is stored, or -1 if it does not belong
/// to this collection.
/// </summary>
/// <param name="member">The member whose index if to be found.</param>
/// <returns>The index at which the given member is stored, or -1 if it does not belong
/// to this collection.</returns>
public int IndexOf(ISchemaEntry member)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.ToString());
}
if (member == null)
{
throw new ArgumentNullException("member", "Member cannot be null.");
}
return(_Members.IndexOf(member));
}