Implementing PayPal on ASP.net website

JUST  FOLLOW THESE THREE STEPS :
set : assign all credential , qty price
get  :get token id , paypalid

do capture :with the hep of paypalid do final payment

Step 1:  In Checkout Page :call PayPal method

   protected void lnkPaypal_Click(object sender, EventArgs e)

    {

            //PaymentThrougPaypal();

            try

            {

                //UpdatePackageOrder();

                PaymentThrougPaypal();

            }

            catch (Exception ex)

            {

                ErrorLog error = new ErrorLog();

                error.lUsrId = Test.BusinessLayer.BusinessAccessLayer.User.Current.lUsrId;

                error.sClientIP = Request.UserHostAddress;

                error.sAbsoluteUri = Request.Url.AbsoluteUri;

                error.sErrMsg = ex.Message;

                error.sStackTrace = ex.Message;

                error.Create();

                //if (ex.Message != "Thread was being aborted.")

                //RollBackUpdatePackageOrder();

            }

    }

    #region Paypal integration

    private void PaymentThrougPaypal()

    {

      //  Session["payment_amt"] = 1000;

        //NVPAPICaller test = new NVPAPICaller();

        string retMsg = "";

        string token = "";

        string sLogo = "http://www.test.com/App_Themes/Default/images/logo1.jpg";

        Test.Paypal.PaypalIntegration.PaypalIntegration paypalRequest = new Test.Paypal.PaypalIntegration.PaypalIntegration();

        paypalRequest.OrderID = OrderId;

        //paypalRequest.ReqConfirmShipping = "1";

        paypalRequest.logo = sLogo;

        Order pOrder = new Order(OrderId);

            if (pOrder.decNetAmount != null)

            {

               // Math.Round((decimal)order.decNetAmount, 2).ToString();

               string host = "www.paypal.com";//"www.paypal.com";//

               // string host = "www.sandbox.paypal.com";

                //string amt = pOrder.decNetAmount.ToString();

               decimal amt1 =Convert.ToDecimal(pOrder.decNetAmount);

               string amt = Math.Round((decimal)amt1, 2).ToString();

              // string amt = Math.Round((decimal)amt1, 2).ToString() + ((pOrder.decPackagePrice.HasValue) ? pOrder.decPackagePrice.Value : 0);

                Test.Paypal.Paypal.Paypal eSet = new Test.Paypal.Paypal.Paypal();

                Test.Paypal.PaypalIntegration.PaypalIntegration _paypalRequest = new Test.Paypal.PaypalIntegration.PaypalIntegration();

               token = eSet.ECSetExpressCheckoutCode(amt, "http://www.test.com/paydetails.aspx", "http://www.test.com/Checkout.aspx", com.paypal.soap.api.PaymentActionCodeType.Order, com.paypal.soap.api.CurrencyCodeType.AUD, paypalRequest, Convert.ToInt64(pOrder.lPOrderId));

 Response.Redirect("https://" + host + "/cgi-bin/webscr?cmd=_express-checkout" + "&token=" + token);

            }

       

    }

    #endregion

Step 2: In Separate Page do all coding to make transactions, this page will run in background

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using com.paypal.sdk.services;

using com.paypal.soap.api;

using com.paypal.sdk.profiles;

using System.Data;

using System.Data.SqlClient;

using System.Text;

using System.Web.Routing;

using GenerateCodeSOAP;

using System.IO;

using System.Collections;

using System.Net;

using System.Net.Mail;

using System.Xml;

using Test.Common;

using Test.Paypal.Paypal;

using Test.BusinessLayer.BusinessAccessLayer;

using Test.BusinessLayer.DataAccessLayer;

public partial class paydetails : FrontPageBase

{

    string token = "";

    string payerId = "";

    string amt = "";

    string InvoiceId = "";

    string cardHolderNm = "";

    string bilAdd = "";

    string traId = "";

    protected void Page_Load(object sender, EventArgs e)

    {

        if (Request.QueryString["token"] != null)

        {

            GetExpressCheckoutDetailsResponseType resp = new GetExpressCheckoutDetailsResponseType();

            Test.Paypal.ECGetExpressCheckout ecGet = new Test.Paypal.ECGetExpressCheckout();

            resp = ecGet.ECGetExpressCheckoutCode(Request.QueryString["token"].ToString());

            //Response.Write(resp);

            payerId = resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.PayerID.ToString();

            amt = resp.GetExpressCheckoutDetailsResponseDetails.PaymentDetails.OrderTotal.Value;

            token = resp.GetExpressCheckoutDetailsResponseDetails.Token.ToString();

            InvoiceId = resp.GetExpressCheckoutDetailsResponseDetails.InvoiceID.ToString();

            cardHolderNm = (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.PayerName.FirstName) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.PayerName.FirstName : string.Empty)

                + "  " + (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.PayerName.LastName) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.PayerName.LastName : string.Empty);

            bilAdd = (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.CityName.ToString()) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.CityName.ToString() : string.Empty)

            + "<br/>" + (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.Street1.ToString()) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.Street1.ToString() : string.Empty)

            + "<br/>" + (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.Street2.ToString()) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.Street2.ToString() : string.Empty)

            + "<br/>" + (!string.IsNullOrEmpty(resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.CountryName.ToString()) ? resp.GetExpressCheckoutDetailsResponseDetails.PayerInfo.Address.CountryName.ToString() : string.Empty);

        }

        if (token != "" && payerId != "")

        {

            DoExpressCheckoutPaymentResponseType ecDoPayment = new DoExpressCheckoutPaymentResponseType();

            Test.Paypal.ECDoExpressCheckout doPayment = new Test.Paypal.ECDoExpressCheckout();

            ecDoPayment = doPayment.ECDoExpressCheckoutCode(token, payerId, amt, com.paypal.soap.api.PaymentActionCodeType.Order, com.paypal.soap.api.CurrencyCodeType.AUD);

            string ack = ecDoPayment.Ack.ToString();

            string authorizationId = ecDoPayment.DoExpressCheckoutPaymentResponseDetails.PaymentInfo.TransactionID;

            string amtValue = ecDoPayment.DoExpressCheckoutPaymentResponseDetails.PaymentInfo.GrossAmount.Value;

            com.paypal.soap.api.CurrencyCodeType amtCurrencyCodeType = com.paypal.soap.api.CurrencyCodeType.AUD;

            Test.Paypal.DoCapture doCapt = new Test.Paypal.DoCapture();

            //Response.Write(ack);

            DoCaptureResponseType doCaptrDetails = new DoCaptureResponseType();

            //  doCaptrDetails = doCapt.DoCaptureCode(authorizationId, note, amtValue, amtCurrencyCodeType, InvoiceId);

            doCaptrDetails = doCapt.DoCaptureCode(authorizationId, amtValue, amtCurrencyCodeType, InvoiceId);

            string captrAck = doCaptrDetails.Ack.ToString();

            //Response.Write(captrAck);

            // Response.Write(ack + "//" + InvoiceId + "//" + captrAck);

            // Response.End();

            if ((ack.ToLower() == "success") && (!String.IsNullOrEmpty(InvoiceId)) && (captrAck.ToLower() == "success"))

            {

                try

                {

                    Order pOrder = new Order(Convert.ToInt64(InvoiceId));

                    Outlet outlet = new Outlet(pOrder.lOutletId);

                    pOrder.orderStatus = Order.OrderStatus.Placed;

                    pOrder.pymtStatus = Order.PaymentStatus.Made;

                    pOrder.sTransactionId = doCaptrDetails.DoCaptureResponseDetails.PaymentInfo.TransactionID.ToString();

                    Response.Write(pOrder.sTransactionId);

                    traId = doCaptrDetails.DoCaptureResponseDetails.PaymentInfo.TransactionID.ToString();

                    pOrder.sPaymentType = "Paypal";

                    pOrder.sGatewaynm = "Paypal";

                    string paypal="paypal";

                    Invoice.GenerateInvoice_New(pOrder,paypal);

                    Invoice.GenerateInvoice_Customer(pOrder,paypal);

                    pOrder.Update();

                    #region Email to Customer with invoice attachment

                    DataTable dtOutletChainColContTemplVal;

                    CMS cms;

                    ContentTemplate conTemp;

                    dtOutletChainColContTemplVal = Test.BusinessLayer.DataAccessLayer.DBChain.PopulateOutletChainsColumnValue(outlet.lOutletId, "TaxInvEmlCustId");

                    if (dtOutletChainColContTemplVal != null)

                    {

                        conTemp = new ContentTemplate(Int16.Parse(dtOutletChainColContTemplVal.Rows[0][0].ToString()));

                        cms = new CMS(Test.BusinessLayer.BusinessAccessLayer.Site.Current.lSiteId, conTemp.shContentTempId);

                    }

                    else

                    {

                        conTemp = new ContentTemplate(Resources.ContentName.mailorderandtaxinvoice);

                        cms = new CMS(Test.BusinessLayer.BusinessAccessLayer.Site.Current.lSiteId, conTemp.shContentTempId);

                    }

  InsertPapalInfo();

Response.Redirect("http://test.com/thank-you-for-your-order.aspx");

}

catch (Exception ex)

                {

                   

                    Response.Write("catch");

                    throw;

                }

            }

            else

            {

                Response.Redirect("http://test.com/Checkout.aspx");

            }

else

        {

            Response.Redirect("http://test.com/Checkout.aspx");

        }

#region method to update Paypal user info

    public void InsertPapalInfo()

    {

        test.BusinessLayer.DataAccessLayer.DBPaypalInfo.InsertPaypalInfo(Convert.ToInt64(InvoiceId), cardHolderNm, bilAdd, traId);

    }

    #endregion

Step 3 :Configure all .cs files

a)      DoCapture.cs

b)      ECDoExpressCheckout.cs

c)       ECGetExpressCheckout.cs

d)      ECSetExpressCheckout.cs

e)      Paypal.cs

f)       PaypalIntegration.cs

And Payflow_dotNET.dll to bin now paypal will work for you thanks !!!!