private void newTextEx()
        {
            //choiceBtn1.BackColor = choiceBtn2.BackColor = choiceBtn3.BackColor = choiceBtn4.BackColor = Color.LightGray;
            nextBtn.Hide();
            hourPic.Hide();
            BtnchoicesPanel.Hide();
            labelPanel.Show();
            imgChoicesPanel.Show();

            PictureBox[] btn = { choice1Pbox, choice2Pbox, choice3Pbox, choice4Pbox };
            foreach (PictureBox b in btn)
            {
                b.Click  -= wrong_click;
                b.Click  -= b_click;
                b.Enabled = true;
            }
            soundPicBox.Click -= sound_click;
            int x = r.Next(0, 12), k, j;

            hourLabel.Text = s[x].Replace('-', ':').Substring(0, 5);
            //btn[l].Click -= b_click;
            //  soundPicBox.Tag = (@"../../../media/") + s[x].Substring(0, 5).Trim() + ".wav";
            soundPicBox.Tag = s[x].Substring(0, 5).Trim();

            soundPicBox.Click += sound_click;
            l = r.Next(0, 4);
            btn[l].ImageLocation = (@"../../../media/") + s[x].Trim();
            btn[l].Click        += b_click;
            int[] rand = new int[3];
            do
            {
                for (j = 0; j < 3; j++)
                {
                    do
                    {
                        k = r.Next(0, 12);
                    } while (k == x);
                    rand[j] = k;
                }
            } while (rand[0] == rand[1] || rand[1] == rand[2] || rand[0] == rand[2]);
            j = 0; k = 0;
            while (j < 4)
            {
                if (j == l)
                {
                    j++;
                }
                else
                {
                    btn[j].ImageLocation = (@"../../../media/") + s[rand[k]].Trim();
                    btn[j].Click        += wrong_click;
                    j++; k++;
                }
            }
            y = r.Next(2);
        }
        private void newImgEx()
        {
            nextBtn.Hide();
            //choiceBtn1.BackColor = choiceBtn2.BackColor = choiceBtn3.BackColor = choiceBtn4.BackColor = Color.LightGray;
            labelPanel.Hide();
            imgChoicesPanel.Hide();
            hourPic.Show();
            BtnchoicesPanel.Show();
            Button[]     btn         = { choiceBtn1, choiceBtn2, choiceBtn3, choiceBtn4 };
            PictureBox[] soundPicbox = { soundPicBox1, soundPicBox2, soundPicBox3, soundPicBox4 };
            foreach (Button b in btn)
            {
                b.Click    -= wrong_click;
                b.Click    -= b_click;
                b.Enabled   = true;
                b.BackColor = Color.LightBlue;
            }
            foreach (PictureBox pbox in soundPicbox)
            {
                pbox.Click -= sound_click;
            }
            int x = r.Next(0, 12), k, j;

            hourPic.ImageLocation = (@"../../../media/") + s[x].Trim();
            //btn[i].Click -= b_click;
            i = r.Next(0, 4);

            btn[i].Text   = s[x].Substring(0, 5).Replace('-', ':');
            btn[i].Click += b_click;
            trueBtn       = btn[i];
            //soundPicbox[i].Tag = (@"../../../media/") + s[x].Substring(0, 5).Trim() + ".wav";
            soundPicbox[i].Tag    = s[x].Substring(0, 5).Trim();
            soundPicbox[i].Click += sound_click;
            int[] rand = new int[3];
            do
            {
                for (j = 0; j < 3; j++)
                {
                    do
                    {
                        k = r.Next(0, 12);
                    } while (k == x);
                    rand[j] = k;
                }
            } while (rand[0] == rand[1] || rand[1] == rand[2] || rand[0] == rand[2]);
            j = 0; k = 0;
            while (j < 4)
            {
                if (j == i)
                {
                    j++;
                }
                else
                {
                    btn[j].Text   = s[rand[k]].Substring(0, 5).Replace('-', ':');
                    btn[j].Click += wrong_click;
                    //soundPicbox[j].Tag = (@"../../../media/") + s[rand[k]].Substring(0, 5).Trim() + ".wav";
                    soundPicbox[j].Tag    = s[rand[k]].Substring(0, 5).Trim();
                    soundPicbox[j].Click += sound_click;
                    j++; k++;
                }
            }
            y = r.Next(2);
        }