How can I split an IEnumerable into groups of IEnumerable [duplicate]

by 
var result = sequence.Select((s, i) => new { Value = s, Index = i })
                     .GroupBy(item => item.Index / 3, item => item.Value);

Note that this will return an IEnumerable<IGrouping<int,string>> which will be functionally similar to what you want. However, if you strictly need to type it as IEnumerable<IEnumerable<string>> (to pass to a method that expects it in C# 3.0 which doesn’t support generics variance,) you should use Enumerable.Cast:

var result = sequence.Select((s, i) => new { Value = s, Index = i })
                     .GroupBy(item => item.Index / 3, item => item.Value)
                     .Cast<IEnumerable<string>>();

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