Updated cell value in wpfdatagrid not getting in corresponding column

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C#

WPF

hi I had a wpf datagrid with column qty and unitprice I had another column price where price=qty*unitprice but am not getting the updated value in datagrid.
I had given binding with mode as two way and update source trigger.

What I have tried:

private void CalculateProductPrice()
{
decimal productprice = 0;

for (int i = 0; i < dgvProducts.Items.Count; i++)
{
BLProducts blpro = dgvProducts.CurrentItem as BLProducts;
blpro.Price = Convert.ToDecimal(blpro.UnitPrice * blpro.Qty);
productprice += blpro.Price;
}

txtproductTotal.Text = Convert.ToString(productprice);
}

blproducts is class which contain properties price, unitprice, qty