Save

 if (checkBox1.Checked&checkBox2.Checked)
            {
                if (File.Exists(@"Settings.txt"))
                {
                    File.Delete(@"Settings.txt");
                    Thread.Sleep(350);
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:True
AutoAttach:True");
                    sw.Close();
                }
                else
                {
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:True
AutoAttach:True");
                    sw.Close();
                }
            }
           else if (checkBox1.Checked)
            {
                if (File.Exists(@"Settings.txt"))
                {
                    File.Delete(@"Settings.txt");
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:True
AutoAttach:False");
                    sw.Close();
                }
                else
                {
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:True
AutoAttach:False");
                    sw.Close();
                }
            }
            else if (checkBox2.Checked)
            {
                if (File.Exists(@"Settings.txt"))
                {
                    File.Delete(@"Settings.txt");
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:False
AutoAttach:True");
                    sw.Close();
                    if (File.Exists("DoNotDelete.txt"))
                    {
                        File.Delete(@"DoNotDelete.txt");
                        StreamWriter SW = new StreamWriter(@"DoNotDelete.txt");
                        SW.Write("False");
                        SW.Close();
                    }
                    else
                    {
                        StreamWriter SW = new StreamWriter(@"DoNotDelete.txt");
                        SW.Write("False");
                        SW.Close();
                    }
                }
                else
                {
                    StreamWriter sw = new StreamWriter(@"Settings.txt");
                    sw.WriteLine(@"TopMost:False
AutoAttach:True");
                    sw.Close();
                    if (File.Exists("DoNotDelete.txt"))
                    {
                        File.Delete(@"DoNotDelete.txt");
                        StreamWriter SW = new StreamWriter(@"DoNotDelete.txt");
                        SW.Write("False");
                        SW.Close();
                    }
                    else
                    {
                        StreamWriter SW = new StreamWriter(@"DoNotDelete.txt");
                        SW.Write("False");
                        SW.Close();
                    }
                }