private void btnAdd_Click(object sender, EventArgs e)
        {
            addExaminationDatas apdf = new addExaminationDatas();

            apdf.lblExNo.Text   = "0";
            apdf.lblex.Text     = "New personal Information";
            apdf.btnDel.Visible = false;
            apdf.ShowDialog();
        }
        private void DGVex_DoubleClick(object sender, EventArgs e)
        {
            string data             = DGVex.SelectedRows[0].Cells["ExaminationNo"].Value.ToString();
            addExaminationDatas add = new addExaminationDatas();

            add.lblExNo.Text   = data;
            add.lblex.Text     = "Update or Delete Information";
            add.btnDel.Visible = true;
            add.ShowDialog();
        }