private void btnDone1_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Are you sure you have completed the assessment ?", "Message", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                if (isPrescriptionWritten(patient_username1, 1))
                {
                    errorProvider1.Clear();

                    StreamWriter sw = null;
                    StreamReader sr = null;

                    int EmptyLines;
                    EmptyLines = readEmptyLines(Doc_username, 0);

                    string line;  //useful string
                    try
                    {
                        sw = new StreamWriter(Doctor_path + "temp.txt");
                        sr = new StreamReader(Doctor_path + Doc_username + ".txt");
                    }
                    catch { MessageBox.Show("Unable to Open File"); }

                    while (true)
                    {
                        line = sr.ReadLine();
                        if (string.IsNullOrEmpty(line))  //first patient is written after one space
                        {
                            break;
                        }
                        sw.WriteLine(line);
                    }
                    line = sr.ReadLine();
                    while (true)
                    {
                        line = sr.ReadLine();
                        if (line == null)
                        {
                            break;
                        }
                        sw.WriteLine(line);
                    }

                    sr.Close();
                    sw.Close();

                    File.Delete(Doctor_path + Doc_username + ".txt");
                    File.Move(Doctor_path + "temp.txt", Doctor_path + Doc_username + ".txt");

                    MessageBox.Show("Assessment done", "MESSAGE", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    AssessmentDone done = new AssessmentDone(Patient_path, this.patient_username1);
                    done.ShowDialog();

                    clearTextBoxes();

                    manageTextBoxes();
                }
            }
        }
        private void btnDone2_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Are you sure you have completed the assessment ?", "Message", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                if (isPrescriptionWritten(patient_username2, 2))
                {
                    errorProvider1.Clear();

                    StreamReader sr = null;
                    StreamWriter sw = null;
                    string       line;
                    int          count = 0;

                    try
                    {
                        sw = new StreamWriter(Doctor_path + "temp.txt");
                        sr = new StreamReader(Doctor_path + Doc_username + ".txt");
                    }
                    catch { MessageBox.Show("Unable to Open File"); }

                    while (true)
                    {
                        line = sr.ReadLine();
                        if (string.IsNullOrEmpty(line))   //beacause second patient is written after 2 spaces
                        {
                            count += 1;
                            if (count == 2)
                            {
                                break;
                            }
                        }
                        sw.WriteLine(line);
                    }

                    line = sr.ReadLine();

                    while ((line = sr.ReadLine()) != null)
                    {
                        sw.WriteLine(line);
                    }

                    sr.Close();
                    sw.Close();

                    File.Delete(Doctor_path + Doc_username + ".txt");
                    File.Move(Doctor_path + "temp.txt", Doctor_path + Doc_username + ".txt");


                    AssessmentDone done = new AssessmentDone(Patient_path, this.patient_username2);
                    done.ShowDialog();

                    clearTextBoxes();

                    manageTextBoxes();
                }
            }
        }//Done 2 bracket