private void calculation()
{
BeginInvoke(new MethodInvoker(delegate
{
InfoGridView.PostEditor();
InfoGridView.UpdateCurrentRow();
}));
txtValueOfGoods.Text = Convert.ToDecimal(gridColumn18.SummaryItem.SummaryValue).ToString("0.00");
txtTaxableAmount.Text = Convert.ToDecimal(gridColumn18.SummaryItem.SummaryValue).ToString("0.00");
txtTaxAmount.Text = Convert.ToDecimal(gridColumn19.SummaryItem.SummaryValue).ToString("0.00");
txtSurcharge.Text = Convert.ToDecimal(gridColumn21.SummaryItem.SummaryValue).ToString("0.00");
txtNetAmount.Text = (Convert.ToDecimal(txtTaxableAmount.Text) + Convert.ToDecimal(txtTaxAmount.Text) + Convert.ToDecimal(txtSurcharge.Text)).ToString("0.00");
txtRNetAmount.Text = Math.Round(Convert.ToDecimal(txtNetAmount.Text), 2).ToString("0.00");
}