private void refresh_Click(object sender, EventArgs e)
        {
            Pepole pepole = (Pepole)name.Tag;

            pepole.Name    = name.Text;
            pepole.Surname = surname.Text;
            pepole.Vize    = Convert.ToDouble(vize.Text);
            pepole.Final   = Convert.ToDouble(final.Text);
            listBox1.Items.Remove(pepole);
            listBox1.Items.Add(pepole);
        }
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listBox1.SelectedItem == null)
            {
                return;
            }
            Pepole pepole = (Pepole)listBox1.SelectedItem;

            name.Text    = pepole.Name;
            surname.Text = pepole.Surname;
            vize.Text    = pepole.Vize.ToString();
            final.Text   = pepole.Final.ToString();
            name.Tag     = pepole;
        }
        private void add_Click(object sender, EventArgs e)
        {
            Pepole pepole = new Pepole();

            pepole.Name    = name.Text;
            pepole.Surname = surname.Text;
            pepole.Kecdi  += Pepole_Kecdi;
            pepole.Qaldi  += Pepole_Qaldi;
            pepole.Vize    = Convert.ToDouble(vize.Text);
            pepole.Final   = Convert.ToDouble(final.Text);
            listBox1.Items.Add(pepole);
            Tools.Clean(name);
            Tools.Clean(surname);
            Tools.Clean(vize);
            Tools.Clean(final);
        }