private void get_File_Click(object sender, EventArgs e)
        {
            XLS_Class cl = XLS_Class.get_xls();

            if (cl != null)
            {
                get_File.BackColor = Color.Green;
                mcl = cl;
            }
        }
        public void get_File_Func()
        {
            XLS_Class cl = XLS_Class.get_xls();

            if (cl != null)
            {
                get_File.BackColor = Color.Green;
                mcl = cl;
            }
        }