Rotate – Transposing a List using LINQ C#

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This is a simple and flexible solution, it will handle multiple inner lists with any number of dimensions.

List<List<string>> PersonInfo = new List<List<string>>()
{
    new List<string>() {"John", "Peter", "Watson"},
    new List<string>() {"1000", "1001", "1002"}
};


var result = PersonInfo
    .SelectMany(inner => inner.Select((item, index) => new { item, index }))
    .GroupBy(i => i.index, i => i.item)
    .Select(g => g.ToList())
    .ToList();

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