private void saveCost_btn_Click(object sender, EventArgs e)
        {
            try{
                Account_BO ab = new Account_BO();
                ArrayList note = new ArrayList();
                ArrayList temp = new ArrayList();
                note = ab.getNote();
                int f = 0;
                for (int i = 0; i < note.Count; i++)
                {
                    temp.Add(note[i].ToString());

                    if (note[i].ToString() == entryDtp.Text)
                    {

                        temp.Add(writeNote_txt.Text);

                        for (int m = i + 1; m < note.Count ; m++)
                        {
                            temp.Add(note[m].ToString());
                        }
                        ab.setNote(temp);
                        MessageBox.Show("Save Successfully Done");
                        entryDtp.ResetText();
                        writeNote_txt.Clear();
                        f = 1;
                        break;
                    }

                }
                if (f == 0)
                {

                        note.Add(entryDtp.Text);
                        note.Add(writeNote_txt.Text);
                        note.Add("*");
                        ab.setNote(note);
                        MessageBox.Show("Save Successfully Done");
                        entryDtp.ResetText();
                        writeNote_txt.Clear();

                }

            }
            catch(Exception)
            {
                MessageBox.Show("Error !!");
            }
        }