>>Hello Cetin,
>>>>Probably you want a multidimensional array and not a jagged array (according to benchmarks from MS jagged arrays are much slower).
>Cetin
>I found an article on the Net about Arrays : http://www.codeproject.com/dotnet/arrays.asp?
>629632&df=100&forumid=14002&exp=0
>
>I read in that Article that Jagged Array are faster than multidimensional Arrays, quote :
>

>SZARRAYS, perform so much faster than MDARRAYS, that jagged arrays,
>which are SZARRAYS containing other SZARRAYS are highly preferred
>over regular multidimensional arrays for performance. Keep in mind, that
>jagged arrays are not CLS-compliant and may not be worked cross-language.
>

>
>I'm now somewhat confused, do you have any reference to the benchmarks of Microsoft?
>
>Thank you.
>
>Zakaria al Azhar

MS PAG documentation says jagged are faster and recommends jagged arrays vs multidimensional. I think your lines are from PAG documentation.

"There is a minor limitation in the current JIT compiler regarding the graceful elimination of bound checks on rectangular arrays, hence accessing a relatively small two-dimensional jagged array sequentially (row-by-row) might be quicker than accessing a two-dimensional rectangular array on some machines. The same will not be true for larger array sizes as jagged arrays will lose more time in fetching random elements from different locations in memory. You can approximate that the performance of a jagged array is inversely proportional to the number of elements accessed when not walking linearly through each row.
Jagged arrays perform miserably in cases when elements are accessed diagonally or randomly because of their poor locality. Rectangular arrays, on the other hand, seem to perform four to five times better than jagged arrays in such scenarios."

This is from MSDN magazine, "C# in depth:Harness the Features of C# to Power Your Scientific Computing Projects". There you'd also find some more info plus benchmark graphics showing multidimensional are faster, C faster than C#, unmanaged faster than managed etc.

The way you access to elements and the data size matters in summary.
Cetin