protected void LinkButton1_Click(object sender, EventArgs e)
 {
     if (!checkCookie())
         Response.Redirect("Login.aspx");
     String customerUsername = Request.Cookies["Car-Trading"]["Username"].ToString();
     DatabaseHandler obj=new DatabaseHandler();
     DataSet ds=obj.GetCustomerId(customerUsername);
     String customerId = ds.Tables[0].Rows[0]["CUSTOMER_ID"].ToString();
     EncryptDecrypt obj1 = new EncryptDecrypt();
     customerId = HttpUtility.UrlEncode(obj1.Encrypt(customerId));
     Response.Redirect("CustomerBuyCar.aspx?carId=" + Request.QueryString["carId"].ToString() + "&sellerId=" + Request.QueryString["sellerId"].ToString() + "&customerId=" + customerId);
 }