/// <summary>
/// Initializes a new instance of the RosterUpdatedEventArgs class.
/// </summary>
/// <param name="item">The item the RosterUpdated event is being raised
/// for.</param>
/// <param name="removed">Set to true if the item is being removed from
/// the roster.</param>
/// <exception cref="ArgumentNullException">The item parameter is null.</exception>
public RosterUpdatedEventArgs(RosterItem item, bool removed)
{
item.ThrowIfNull("item");
Item = item;
Removed = removed;
}
/// <summary>
/// Removes the specified item from the user's roster.
/// </summary>
/// <param name="item">The item to remove.</param>
/// <exception cref="ArgumentNullException">The item parameter is null.</exception>
/// <exception cref="IOException">There was a failure while writing to or reading
/// from the network.</exception>
/// <exception cref="InvalidOperationException">The XmppClient instance is not
/// connected to a remote host, or the XmppClient instance has not authenticated with
/// the XMPP server.</exception>
/// <exception cref="ObjectDisposedException">The XmppClient object has been
/// disposed.</exception>
/// <exception cref="XmppErrorException">The server returned an XMPP error code.
/// Use the Error property of the XmppErrorException to obtain the specific
/// error condition.</exception>
/// <exception cref="XmppException">The server returned invalid data or another
/// unspecified XMPP error occurred.</exception>
public void RemoveContact(RosterItem item)
{
AssertValid();
item.ThrowIfNull("item");
im.RemoveFromRoster(item);
}
/// <summary>
/// Initializes a new instance of the RosterUpdatedEventArgs class.
/// </summary>
/// <param name="item">The item the RosterUpdated event is being raised
/// for.</param>
/// <param name="removed">Set to true if the item is being removed from
/// the roster.</param>
/// <exception cref="ArgumentNullException">The item parameter is null.</exception>
public RosterUpdatedEventArgs(RosterItem item, bool removed)
{
item.ThrowIfNull("item");
Item = item;
Removed = removed;
}