protected void txtorder_TextChanged(object sender, EventArgs e)
    {
        bool Auth = Specimen.GetOrderNoAuthentication(txtorder.Text.Trim());

        if (Auth)
        {
            MessageBox("Order no is already Exist");
            txtorder.Text = "";
            txtorder.Focus();
        }
        else
        {
            txtOrdDate.Focus();
        }
    }