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What is the most efficient to add items to a multi-dimensional array where you don't know the item count at the start?

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    Use a List<List<T>>. Arrays are designed to start with a fixed size; lists are designed to be able to grow. Otherwise you have to resize the array manually. Commented Mar 6, 2015 at 17:49

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You can use Array.GetLength method to get lenght of each dimension, then you can just populate your array using a simple for loop.

For example:

for(int x = 0; x < array.GetLength(0); x++)
{
     for(int y = 0; y < array.GetLength(1); y++)
     {
          array[x,y] = "bla,bla...";
     }
}
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