BiomePainter.Form1.btnAddorRemovebyBlocks_Click C# (CSharp) Method

        private void btnAddorRemovebyBlocks_Click(object sender, EventArgs e)
        {
            if (world == null || region == null)
                return;
            int[] blockIds = null;
            bool add = sender == btnAddbyBlocks ? true : false;
            switch ((String)cmbBlockType.SelectedItem)
            {
                case "Cacti & Dead Bushes":
                    blockIds = new int[] { 81, 32 };
                    break;
                case "Dirt & Grass":
                    blockIds = new int[] { 2, 3 };
                    break;
                case "Flowers & Tall Grass":
                    blockIds = new int[] { 31, 37, 38 };
                    break;
                case "Gravel":
                    blockIds = new int[] { 13 };
                    break;
                case "Lily Pads & Vines":
                    blockIds = new int[] { 111, 106 };
                    break;
                case "Leaves & Logs":
                    blockIds = new int[] { 17, 18 };
                    break;
                case "Ice":
                    blockIds = new int[] { 79 };
                    break;
                case "Sand":
                    blockIds = new int[] { 12 };
                    break;
                case "Snow":
                    blockIds = new int[] { 78, 80 };
                    break;
                case "Stone":
                    blockIds = new int[] { 1 };
                    break;
                case "Water":
                    blockIds = new int[] { 8, 9 };
                    break;
                case "Input Block ID":
                    {
                        String msg = String.Format("Type the ID number of the block type you want to {0}.{1}See http://www.minecraftwiki.net/wiki/Data_values for more info.", add ? "add to the selection" : "remove from the selection", Environment.NewLine);
                        String input = "";
                        while (true)
                        {
                            input = InputBox.Show(msg, add ? "Add to Selection" : "Remove From Selection", input);
                            if (input.Length == 0)
                                break;

                            Match m = Regex.Match(input, @"^(\d+)$");
                            if (m.Groups.Count < 2)
                            {
                                msg = "Unable to parse block ID. Please try again or click cancel.";
                            }
                            else
                            {
                                int id;
                                if (!Int32.TryParse(m.Groups[1].Value, out id))
                                {
                                    msg = "Unable to parse block ID. Please try again or click cancel.";
                                }
                                else
                                {
                                    blockIds = new int[] { id };
                                    break;
                                }
                            }
                        }
                    }
                    break;
            }
            if (blockIds != null)
            {
                UpdateStatus(add ? "Adding to selection" : "Removing from selection");
                RegionUtil.AddorRemoveBlocksSelection(region, imgRegion.Layers[SELECTIONLAYER].Image, imgRegion.SelectionColor, blockIds, add);
                UpdateStatus("");
                imgRegion.Redraw();
                history.RecordSelectionState(imgRegion.Layers[SELECTIONLAYER].Image, add ? "Select by Block" : "Deselect by Block");
            }
        }