1using System;
2using System.Collections;
3using System.ComponentModel;
4using System.Configuration;
5using System.Data;
6using System.Data.SqlClient;
7using System.Drawing;
8using System.Web;
9using System.Web.SessionState;
10using System.Web.UI;
11using System.Web.UI.WebControls;
12using System.Web.UI.HtmlControls;
13using System.Net;
14using System.Text;
15using System.IO;
16
17namespace PayPalTest
18{
19	public class PDTHandler : System.Web.UI.Page
20	{
21		#region Web Form Designer generated code   ...
22
23		override protected void OnInit(EventArgs e)
24		{
25			InitializeComponent();
26			base.OnInit(e);
27		}
28		
29		private void InitializeComponent()
30		{    
31			this.Load += new System.EventHandler(this.Page_Load);
32		}
33		#endregion
34
35		const string PAGENAME = "PDTHandler";
36		#region Page_Load   ...
37
38		private void Page_Load(object sender, System.EventArgs e)
39		{
40			//Check if transaction canceled
41			if (Request.QueryString["tx"] == null)
42				Response.Redirect("Message.aspx?M=1");
43			else
44			{
45				//Get the PDT data from PayPal
46				string strPDT = GetPDT();
47
48				//Success?
49				if (strPDT.IndexOf("SUCCESS") > -1)
50					Response.Redirect("Message.aspx?M=2");
51				else
52					Response.Redirect("Message.aspx?M=3");
53			}
54		}
55		#endregion
56		#region GetPDT   ...
57
58		private string GetPDT()
59		{
60			string PDTID = ConfigurationSettings.AppSettings["PayPalPDTID"];
61			string strTransID = Request.QueryString["tx"].ToString();
62			string strServerURL ="https://www.paypal.com/cgi-bin/webscr";
63
64			string strFormValues = Request.Form.ToString();
65			string strNewValue;
66			string strResponse;
67
68			//Create the request back
69			HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(strServerURL);
70
71			//Set values for the request back
72			objRequest.Method = "POST";
73			objRequest.ContentType = "application/x-www-form-urlencoded";
74			strNewValue = strFormValues + "&cmd=_notify-synch&at=" + PDTID + "&tx=" + strTransID;
75			objRequest.ContentLength = strNewValue.Length;
76
77			//Write the request back IPN strings
78			StreamWriter objSW = new StreamWriter (objRequest.GetRequestStream(), System.Text.Encoding.ASCII);
79			objSW.Write(strNewValue);
80			objSW.Close();
81
82			//Do the request to PayPal and get the response
83			StreamReader objSR = new StreamReader(objRequest.GetResponse().GetResponseStream());
84			strResponse = objSR.ReadToEnd();
85			objSR.Close();
86
87			//Return the response
88			return Server.UrlDecode(strResponse);
89		}
90		#endregion
91		#region GetPDTValue   ...
92
93		string GetPDTValue(string strPDT, string key){
94			
95			string[] arrBits = strPDT.Split('\n');
96
97			string strField = "";
98			string strValue = "";
99			string strLine = "";
100			
101			string strOut = "";
102			for(int i = 0; i < arrBits.Length; i++)
103			{
104				strLine = arrBits[i].ToString();
105				if(strLine.IndexOf("=") > -1)
106				{
107					strField = strLine.Substring(0, strLine.IndexOf("="));
108					strValue = strLine.Remove(0, strLine.IndexOf("=")+1);
109					if(strField == key)
110						strOut = strValue;						
111				}
112			}
113			return strOut;
114		}
115		#endregion
116	}
117}