string s1="51,102,100,115,102,208,186,208,181,209,131,208,186";

.Split()
int.Parse()
Convert.ToChar()

h33 = textBox22.Text.ToString().Trim().Replace("\"", "'");
                for (int i = 0; i < h33.Length; i++)
                {



                    long dec = Convert.ToInt64(h33[i]);
                    strpreob1 = strpreob1 + dec.ToString() + ",";

                }
                strpreob1 = strpreob1.Substring(0, strpreob1.Length - 1);

string[] byte1=null;
                    string f1 = "";
                    byte1 = s6.Split(',');
                    for (int i = 0; i < byte1.Count(); i++)

                    {
                        f1 = f1 + Convert.ToChar(int.Parse(byte1[i])).ToString();
                    }
                    s6 = f1;