iteratively filling array list in C#

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C#

Hi I want to fill arraylist in c# iteratively.actually I am doing small program in image processing (to remove noise from image) in which I have mask of size 3*3 that mean for each pixel on image it will collect 9 values. for example consider we have image of size 10*10 so total no. of pixels would be 100, now for each pixel it will collect its 9 neighbor value and fill it in array list. code is

for (int ii = 0; ii < img.Width; ii++)
                {
                    for (int jj = 0; jj < img.Height; jj++)
                    {

                        if (ii - 1 >= 0 && jj - 1 >= 0)
                        {
                            c = img.GetPixel(ii - 1, jj - 1);
                            mask[0] = Convert.ToInt16(c.R);
                        }
                        else
                        {
                            mask[0] = 0;
                        }

                        if (jj - 1 >= 0 && ii + 1 < img.Width)
                        {
                            c = img.GetPixel(ii + 1, jj - 1);
                            mask[1] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[1] = 0;

                        if (jj - 1 >= 0)
                        {
                            c = img.GetPixel(ii, jj - 1);
                            mask[2] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[2] = 0;

                        if (ii + 1 < img.Width)
                        {
                            c = img.GetPixel(ii + 1, jj);
                            mask[3] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[3] = 0;

                        if (ii - 1 >= 0)
                        {
                            c = img.GetPixel(ii - 1, jj);
                            mask[4] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[4] = 0;

                        if (ii - 1 >= 0 && jj + 1 < img.Height)
                        {
                            c = img.GetPixel(ii - 1, jj + 1);
                            mask[5] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[5] = 0;

                        if (jj + 1 < img.Height)
                        {
                            c = img.GetPixel(ii, jj + 1);
                            mask[6] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[6] = 0;


                        if (ii + 1 < img.Width && jj + 1 < img.Height)
                        {
                            c = img.GetPixel(ii + 1, jj + 1);
                            mask[7] = Convert.ToInt16(c.R);
                        }
                        else
                            mask[7] = 0;
                        c = img.GetPixel(ii, jj);
                        mask[8] = Convert.ToInt16(c.R);
                                                                                          
                                               
                       
             }

                    double[][] collection_input ={
                                                  
                                        new double[9]{mask[0],mask[1],mask[2],mask[3],mask[4],mask[5],mask[6],mask[7],mask[8]}     
                                               
                                             };

here I want collection_ input contain 9 value for each pixel in this case it would be 9 value for each pixel total would be 900. plz help me if u know this

[edit]Code block added - OriginalGriff[/edit]