private void form1Load(object sender, EventArgs e)
        {
            checkFiles();
            List <string> columns = client.Columns();

            columns.RemoveRange(0, 8);

            var columns2 = client.Columns();

            columns2.RemoveRange(0, 8);

            var columns3 = client.Columns();

            columns3.Insert(0, "[Show All]");
            columns3.RemoveAt(8);

            comboBox1.DataSource = columns3;
            comboBox2.DataSource = columns;
            comboBox3.DataSource = columns2;

            textBox1.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
        }