private void saveButton_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                pathToSave = saveFileDialog1.FileName;
                FileInfo newFile = new FileInfo(pathToSave);
                if (newFile.Exists)
                {
                    if (MessageBox.Show("Файл с таким именем уже существует. Хотите перезаписать?", "Сообщение", MessageBoxButtons.YesNo)
                        == DialogResult.Yes)
                    {
                        try
                        {
                            SaveFile.SaveThisInFile(pathToSave, allWeHave);
                        }
                        catch (Exception)
                        {
                            MessageBox.Show("Что-то пошло не так");
                        }
                    }
                } else
                {
                    File.Create(pathToSave);
                    try
                    {
                        SaveFile.SaveThisInFile(pathToSave, allWeHave);
                    }
                    catch (Exception)
                    {
                        MessageBox.Show(pathToSave);
                    }
                }
            }
        }

public class SaveFile
    {
        public static void SaveThisInFile(string path, List<Tonnel> listToSave)
        {
            string[] list = new string[listToSave.Count + 1];
            list[0] = $"ROWNUM;Name;Tunnel;AdmArea;District;Longitude_WGS84;Latitude_WGS84;global_id;";
            for (int i = 1; i <= listToSave.Count + 1; ++i)
            {
                list[i] = "";
                list[i] = $"{i};\"{listToSave[i].Name}\";\"{listToSave[i].Tunnel};{listToSave[i].District.AdmArea}\";\"{listToSave[i].District.Distr}\";\"{listToSave[i].Longtitude_WGS84}\";\"{listToSave[i].Latitude_WGS84}\";\"{listToSave[i].Global_id}\";";
            }
            File.WriteAllLines(path, list);
        }
    }