How to convert arrays to lists C#

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C#

I have several arrays to collect data from a postgreSQL query. The data comes from RF receiver deployed in the field. As the user establishes the range of frequencies and time for the query the data is displayed on gridview and passed from there to the arrays indicated by an I value and a I + value matching the cell number in the column containing the latitude of the RF receiver. This data is use to plot xy scatter graphs representing (frequency,amplitude), (frequency,bandwidth) etc. I would like to create a list and objects instead of using arrays.

What I have tried:

dataGridView1.SelectAll();
                    numCells = dataGridView1.SelectedCells.Count;
for (i = 14; i < (numCells); i += 14)
                       
                    {

                        if (i < numCells)
                        {
                            
                            if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.464258839)
                            {
                                UCS1size += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.42859146)
                            {
                                MOCsize += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.490616471)
                            {
                                AMsize += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.525409911)
                            {
                                UCS2size += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.560529988)
                            {
                                LC40size += 1;
                            }
                        }

                        else
                        {
                            MessageBox.Show("exiting for loop. numcells: " + numCells);
                        }

                    }
 double[] freqLC40 = new double[LC40size];
                    double[] ampMaxLC40 = new double[LC40size];
                    
                    double[] freqMOC = new double[MOCsize];
                    double[] ampMaxMOC = new double[MOCsize];

                    double[] freqUCS1 = new double[UCS1size];
                    double[] ampMaxUCS1 = new double[UCS1size];


                    double[] freqUCS2 = new double[UCS2size];
                    double[] ampMaxUCS2 = new double[UCS2size];


                    double[] freqAM = new double[AMsize];
                    double[] ampMaxAM = new double[AMsize];


                    int LC40idx = 0;
                    int MOCidx = 0;
                    int UCS1idx = 0;
                    int UCS2idx = 0;
                    int AMsidx = 0;


                    for (i = 14; i < (numCells); i += 14)
                    {

                        if (i < numCells)
                        {
                            if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.464258839)
                            {
                                freqUCS1[UCS1idx] = Convert.ToDouble(dataGridView1.SelectedCells[i].Value.ToString());
                                ampMaxUCS1[UCS1idx] = Convert.ToDouble(dataGridView1.SelectedCells[i + 9].Value.ToString());
                                UCS1idx += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.42859146)
                            {
                                freqMOC[MOCidx] = Convert.ToDouble(dataGridView1.SelectedCells[i].Value.ToString());
                                ampMaxMOC[MOCidx] = Convert.ToDouble(dataGridView1.SelectedCells[i + 9].Value.ToString());
                                MOCidx += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.490616471)
                            {
                                freqAM[AMsidx] = Convert.ToDouble(dataGridView1.SelectedCells[i].Value.ToString());

                                ampMaxAM[AMsidx] = Convert.ToDouble(dataGridView1.SelectedCells[i + 9].Value.ToString());
                                AMsidx += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.525409911)
                            {
                                freqUCS2[UCS2idx] = Convert.ToDouble(dataGridView1.SelectedCells[i].Value.ToString());
                                ampMaxUCS2[UCS2idx] = Convert.ToDouble(dataGridView1.SelectedCells[i + 9].Value.ToString());
                                UCS2idx += 1;
                            }
                            else if (Convert.ToDouble(dataGridView1.SelectedCells[i + 11].Value.ToString()) == 28.560529988)
                            {
                                freqLC40[LC40idx] = Convert.ToDouble(dataGridView1.SelectedCells[i].Value.ToString());
                                ampMaxLC40[LC40idx] = Convert.ToDouble(dataGridView1.SelectedCells[i + 9].Value.ToString());
                                LC40idx += 1;
                            }

                        }
                        else
                        {
                            MessageBox.Show("exiting for loop. numcells: " + numCells);
                        }

                    }


            //get XY form LC40
            xyForm = new XYplotForm();
            xyForm.Plot(freqLC40, ampMaxLC40, "LC-40 Max Amplitude");
            xyForm.Show();