Copying an multi dimensional array to a bigger multidimensional array out of bound !

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C#

Hello Codeproject,

I am trying to paste nine multi-dimensional arrays to one big multi-dimensional array.
Basically the smaller ones are 20 by 20, and the bigger one is 60 by 60. So there should fit nine smaller ones in right ? Well apparently I am making it go out of bounds.

Here is the code;

// -- Fill up the Sticked Chunk.
for (int i = 1; i <= 3; i++)
{
    for (int j = 1; j <= 3; j++)
    {
        // -- Right Chunk.
        int RightChunk = i * j;

        // -- Get writing cooardinate.
        int WritingX = (i * World.ChunkSize);
        int WritingY = (j * World.ChunkSize);

        // -- Get all the Blocks.
        for (int x = 0; x < World.ChunkSize; x++)
        {
            for (int y = 0; y < World.ChunkSize; y++)
            {
                    Block _Block = new Block();
                    _Block.BlockID = LoadedChunks[RightChunk].GetBlockID(x, y);
                    StickedChunk._Blocks[WritingX + x, WritingY + y] = _Block;
            }
        }
    }
}

The 'Sticked Chunk' is the bigger one.

Edit: Anyone ?