protected void btnUpdate_Click(object sender, EventArgs e) { Products p = new Products(); p.ProductCode = Convert.ToInt32(Request.QueryString["p_c_z"]); p.CategoryCode = Convert.ToInt32(ddlCategory.SelectedValue); p.ProductName = txtProductName.Text; p.PurchaseRate = Convert.ToDecimal(txtPurchaseRate.Text); p.SaleRate = Convert.ToDecimal(txtSaleRate.Text); p.ExpiryDate = Convert.ToDateTime(txtExpiryDate.Text); DALProduct obj = new DALProduct(); obj.Product_Update(p); Response.Redirect("ProductList.aspx"); }