public static string Method<T1, T2, T3>(this (T1, T2, T3) value)
{
    return string.Format("{0}; {1}; {2}", value.Item1, value.Item2, value.Item3);
}

public static (T2, T3, T1) Method2<T1, T2, T3>(this (T1, T2, T3) value)
{
    return (value.Item2, value.Item3, value.Item1);
}