public virtual void ClearData()
        {
            foreach (Control c in this.Controls)
                if (c.Controls.Count > 0)
                    for (int i = 0; i < c.Controls.Count; i++)
                        ClearControl(c.Controls[i]);
                else
                    this.ClearControl(c);
            
        }

        private void ClearControl(Control c)
        {

            if (c is TextBox)
            {
                TextBox tb = (TextBox)c;
                tb.Text = "";
            }

            if (c is CheckBox)
            {
                CheckBox chk = (CheckBox)c;
                chk.Checked = false;
            }

            if (c is ListView)
            {
                ListView lv = (ListView)c;
                lv.Items.Clear();
            }

            if (c is DataGridView)
            {
                DataGridView dgv = (DataGridView)c;
                dgv.Rows.Clear();
            }
        }