private void Product_IndexChanged(object sender, EventArgs e)
{
int PreviousPrice = 0;
productID = cboProduct.SelectedValue.ToInt();
if (releaseService.IsUpperData(productGroupID, productID, ref PreviousPrice, ref PreviousTime) == true)
{
txtPreviousPrice.Text = PreviousPrice.ToString("#,0");
dtpStartDate.Value = PreviousTime.Value.AddDays(1);
}
else
{
txtPreviousPrice.Text = "-";
}
}