protected void btnupdate_Click(object sender, EventArgs e) { REF_Stock oREF_Stock = new REF_Stock(); DAC_Stock oDAC_Stock = new DAC_Stock(); oREF_Stock.ID = StockID; oREF_Stock.ItemID = ItemName.Text; int Qty = Convert.ToInt32(Quentity.Text) + Convert.ToInt32(newQty.Text); oREF_Stock.Qty = Qty.ToString(); oDAC_Stock.Update(oREF_Stock); Response.Redirect("./frmStock.aspx", true); }