/// <param name="preserveOldContent">true, preserve old content will be unset. false, preserve old content will not be unset.</param>
/// <returns>TRUE on success, FALSE otherwise.</returns>
/// <since_tizen> preview </since_tizen>
/// <param name="preserveOldContent">true, preserve old content will be unset. false, preserve old content will not be unset.</param>
/// <returns>TRUE on success, FALSE otherwise.</returns>
/// <since_tizen> preview </since_tizen>