Row<T1, T2>

    [StructLayout(LayoutKind.Sequential)]
    internal struct Row<T1, T2>
    {
        internal T1 Col1;
        internal T2 Col2;

        public Row (T1 col1, T2 col2)
        {
            this.Col1 = col1;
            this.Col2 = col2;
        }
    }