Using Linq with 2D array, Select not found

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In order to use your multidimensional array with LINQ, you simply need to convert it to IEnumerable<T>. It’s simple enough, here are two example options for querying

int[,] array = { { 1, 2 }, { 3, 4 } };

var query = from int item in array
            where item % 2 == 0
            select item;

var query2 = from item in array.Cast<int>()
                where item % 2 == 0
                select item;

Each syntax will convert the 2D array into an IEnumerable<T> (because you say int item in one from clause or array.Cast<int>() in the other). You can then filter, select, or perform whatever projection you wish using LINQ methods.

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