protected void Button2_Click(object sender, EventArgs e)
    {
        String brand = TextBox1.Text;
        String modelName = TextBox2.Text;
        String modelNum = TextBox3.Text;
        String possessionType = RadioButtonList1.Text;
        String yearOfPurchase = DropDownList2.Text;
        String carPrice = TextBox4.Text;
        String carEngine = TextBox5.Text;
        String carStock = TextBox8.Text;
        String fuelType = DropDownList1.Text;
        String frontImg = FileUpload1.PostedFile.FileName;
        String sideImg = FileUpload2.PostedFile.FileName;
        String rearImg = FileUpload3.PostedFile.FileName;

        String frontImgFolder = HttpContext.Current.Server.MapPath("~\\Car\\Front");
        String frontImgTarget = Path.Combine(frontImgFolder, frontImg);
        FileUpload1.SaveAs(frontImgTarget);

        String sideImgFolder = HttpContext.Current.Server.MapPath("~\\Car\\Side");
        String sideImgTarget = Path.Combine(sideImgFolder, sideImg);
        FileUpload2.SaveAs(sideImgTarget);

        String rearImgFolder = HttpContext.Current.Server.MapPath("~\\Car\\Rear");
        String rearImgTarget = Path.Combine(rearImgFolder, rearImg);
        FileUpload3.SaveAs(rearImgTarget);

        DatabaseHandler obj = new DatabaseHandler();
        String carId = "CAR_" + DateTime.Now.Ticks.ToString();
        obj.InsertCar(carId, brand, modelName, modelNum, possessionType, yearOfPurchase, carPrice,
            carEngine, fuelType, frontImgTarget, sideImgTarget, rearImgTarget);
        String sellerUsername = Request.Cookies["Car-Trading"]["Username"];
        DataSet ds = obj.GetSellerId(sellerUsername);
        String sellerId = ds.Tables[0].Rows[0]["SELLER_ID"].ToString();
        ds = obj.GetSellerName(sellerId);
        String sellerName = ds.Tables[0].Rows[0]["SELLER_NAME"].ToString();
        obj.InsertSellerCar(sellerId, carId, carStock);

        Response.Write("Car Added");
        TextBox1.Text = "";
        TextBox2.Text = "";
        TextBox3.Text = "";
        TextBox4.Text = "";
        TextBox5.Text = "";
        TextBox8.Text = "";
        RadioButtonList1.ClearSelection();
    }