private void btnDelete_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Do You really want to delete this Administrator?", "DELETE", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
            {
                int refadmin = (int)gridAll.Rows[gridAll.CurrentRow.Index].Cells[0].Value;

                if (admin.Delete_Admin(refadmin))
                {
                    MessageBox.Show("Admin ID" + refadmin + " is successfully Deleted", "Admin Deleted");
                }
                else
                {
                    MessageBox.Show("Administrator " + refadmin + " is not deleted.", "Try Again");
                }
            }
            gridAll.DataSource = admin.Search_All_Admins();
            ButtonControl(true, true, false, false, true, false);
        }