private void button1_Click(object sender, EventArgs e)
        {
            if (Mainlist.SelectedItems.Count > 0)
            {
                ListViewItem item = Mainlist.SelectedItems[0];


                var vis = SQLDoc.GetHisP(Int32.Parse(item.SubItems[0].Text));

                {
                    textBox6.Text = vis.First().Exam_Code; //rodzaj

                    textBox9.Text = vis.First().Result;    //wyn
                }
            }
        }