transfer data from windows mobile to server and retrieve it

Question

5.00/5 (1 vote)

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hello friends!!

I want to send data e.g imei no to server from windows mobile. we have asp.net application on the server . Please tell me how to send this and retrieve the sent data, so that we can insert it into database.
Thank you

[EDIT]

this what i have done. Client side program

C#

using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;

namespace Client
{
    public partial class Form1 : Form
    {
        string url = "http://localhost/testwebsite/default.aspx?field1=name";
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_Send_Click(object sender, EventArgs e)
        {
            try
            {
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(new Uri(url));
               
            }
            catch (Exception ex) { MessageBox.Show(ex.Message.ToString()); }
        }
    }
}

Server side program:

C#

protected void Button1_Click(object sender, EventArgs e)
   {
       try
       {
           String s = Request.QueryString["field1"];
           Label1.Text = "value got:" + s.ToString();
       }
       catch (Exception ex) { Label1.Text = ex.Message.ToString(); }


   }

This i have done just for testing purpose.
but am getting the following error when click on the button in asp.net website
Object reference not set to an instance of an object.

Posted 5-Apr-11 7:46am

Noel3090

Updated 7-Apr-11 9:51am

Sergey Alexandrovich Kryukov

v4

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pankajupadhyay29 5-Apr-11 14:00pm

what you want?? To create a windows mobile application which communicate with server ??????????

Noel3090 5-Apr-11 15:01pm

yes and then upload some data to website (asp.net) retrieve data from it and store it in database

walterhevedeich 7-Apr-11 21:59pm

From what I understand, you want to pass IMIE NO from your client application to the website, and then, to the database. If I may ask, whats the purpose of having the data sent to the website first. Can you just send it directly to the database?

2 solutions

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pankajupadhyay29 · Answer 1 · 2011-04-05T17:56:00

Use ASP.Net web service and call that service from your windows mobile application where you can get that information and in the web service you can write the code to save the data to db.

Following links might help you to get Device information in windows mobile application

http://www.codeguru.com/forum/showthread.php?t=444933[^]
http://social.msdn.microsoft.com/Forums/en-US/vssmartdevicesvbcs/thread/c10f1962-257f-449a-84be-bc4e25753099/[^]

Links for creating web service

Your first C# Web Service[^]
ASP.NET Web Service[^]

For a while if you don't want to go through creating web service then do one thing create a web service project in vs the helloword method will created for you

copy that and rename put a string parameter imieno and in function body save that value to db.
--Pankaj

Sergey Alexandrovich Kryukov · Answer 2 · 2011-04-05T08:08:00

Solution 1

There is no such thing as "transfer data" to "just server". Usually, the Server is a machine. What it does totally depends on the software it runs, and there is nothing generic about it. You need to decide what your server-part software should do (and perhaps develop such software if a regular FTP or HTTP server is not what you need), only than you should think what a particular client part should do.

[EDIT]
Answering follow-up Question:
Now I understand the server is HTTP. I did not get why a regular Web client is not an options. Probably some local code (and the Mobile client system should be involved). In this case, you need to use the class System.Net.HttpWebRequest: send a request (using POST method, I presume) to the server. Check is all the API you use is available for your system. I found platform compatibility information on the help pages for Framework v.2.0, 3.0 and 3.5 (http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest(v=vs.90).aspx[^]), but by some reason not for 4.0. (maybe this version is not yet ready for this platform?). Anyway, I think it should be available on the Framework already installed on your mobile device.

Look at the code sample here: http://msdn.microsoft.com/en-us/library/system.net.webrequest.aspx[^]. This class is abstract, but run-time class will be System.Net.HttpWebRequest, as it will be constructed via the factory WebRequest.Create method which will select appropriate run-time by your URL.

The example above is just a skeleton.
I have found a more detailed sample for you, this time the one using "POST" method and actually sending some data. It should be very close to your client code. Here: http://msdn.microsoft.com/en-us/library/debx8sh9.aspx[^].

You can test it using some available running Web site.

—SA

Posted 5-Apr-11 8:08am

Sergey Alexandrovich Kryukov

Updated 8-Apr-11 8:32am

v7

Comments

Noel3090 5-Apr-11 14:38pm

thanks SAKryukov for the reply
But i mentioned above that we asp.net application on the server.. ie we need to send data to asp.net website and retrieve it and store it in database

Sergey Alexandrovich Kryukov 5-Apr-11 15:00pm

Or, I see. Sorry, I did not pay attention. Still, it it a regular form with POST method? Why just using a Web browser in the mobile is not a solution? If it's something special, you should explain it...
--SA

Noel3090 6-Apr-11 11:35am

i have windows mobile application. so i hv to retrieve imei no and send to server. And then insert the retrieved value in database. please help, i really cant understand how to do it

Sergey Alexandrovich Kryukov 6-Apr-11 16:47pm

I updated the Answer. Please see the text after [EDIT]
--SA

Noel3090 7-Apr-11 8:56am

but how to post data when you have windows mobile application? am not using browser.

Sergey Alexandrovich Kryukov 7-Apr-11 12:47pm

I say, the post is done via HttpWebRequest.

After all, I gave you only one reference, read it, finally! This is all you need, everything is explained there.

This is exactly what it is: the class to send POST, GET or any other HTTP request to any Web site through its URL and get a response from the Web site. HttpWebRequest is instead of Browser and can do any request a real Browser can do. Do you think a Browser does anything complex? Only page rendering is extremely complex, everything else is just sending HTTP request and getting response (which you probably don't even need, you need only the status if the operation).

This is simple enough. See the help on this class: Microsoft give you nice and clear code sample.

--SA

Sergey Alexandrovich Kryukov 7-Apr-11 16:04pm

I saw your code. O gosh, what are you trying to do? Why on earth you're trying to use Request on server side?! I have no idea how you want to test it. Use available Web site, I don't think you can simulate it right now (well install one on the local computer -- another option).

I've added some usage sample to my updated Answer.

Exception... better don't report it at all. You need to report exception dump, use Exception stack to show all lines of code where it goes. Comment relevant lines of code in your code sample. How anyone can understand which reference is null?

OK, go ahead now. I gave you some more instruction. You must be pretty close.

--SA

Noel3090 8-Apr-11 2:37am

Sorry SAKryukov am pretty new to this asp.net, so it would very nice if you could tell me in detail.
Thanks for the reply.
But i dint understand Use availale website. Am doing this, all on local Pc.
and Regarding server code, what to use instead of "request"b??

Sergey Alexandrovich Kryukov 8-Apr-11 11:00am

Oh, if you're using your local Web server, it's OK.
I don't understand you code on server side, because this is a very small fragment. It it is a server, how can you use Request. I cannot tell you what to use instead, because I have no idea what are you trying to do. You need HTTP server and some code behind to process the posted data. It should be two URLs and Web pages (one with form, another processing post and showing result) or just one URL (optionally showing different pages depending on is it before post or already posted). I thought you're only working at client part, so you already have a Web application to work in production. If you need to test it, you need identical or similar Web application...
--SA

Noel3090 8-Apr-11 12:32pm

if you didnt understand, am explaining you again.
I have windows mobile app, which retrievs location info e.g latitude . this app then sends that info to server with asp.net. Now i want this data to be retrieved and then stored in database.

Sergey Alexandrovich Kryukov 8-Apr-11 12:44pm

I understood it in first place, if you still did not notice that.
Do you have this APS.NET application already or have to develop it?
You original question was about client part. I gave you the answer.
You do not explain what is you difficulty right now.
(I see no sense in your server-part code, but you did not asked anything about it, you only asked in response to my note that I don't see any sense in using request in that code. You did not really show enough code of the server side and never answered what do you want to achieve. If you still have a question about server side, explain it first. What you just repeated does not add anything to this information.)
--SA

Noel3090 8-Apr-11 13:05pm

thanks SA. M realy running out of time, i need this for my final year project.
We have already developed asp.net appl. If you were in my place how you would have done it?
Please help me.

Sergey Alexandrovich Kryukov 8-Apr-11 13:18pm

Good. Can you use this ASP.NET application or run its copy close to you? This way, you need not to waste time on server-side programming for the testing/debugging (and you also could suffer from new mistakes). You can try to use a regular post using a Web browser (is it possible?) to be able to compare results with HttpWebRequest.
--SA

Sergey Alexandrovich Kryukov 8-Apr-11 13:48pm

OK, it looks reasonable for the first glance, but again you're trying to simulate HTTP server. My idea was different: it is possible to use existing ASP.NET application (this code is not it, isn't it?)? What problems do you have so far?
Also, could you please copy this code by updating your Question via "Improve question"? I'll later remove this comment properly, as having such long comment makes discussion more difficult?..
--SA

Noel3090 8-Apr-11 13:26pm

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));
request.Method = "POST";
//[Look here: who will actually send some data? You have to... -- SA]
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

Sergey Alexandrovich Kryukov 8-Apr-11 13:50pm

OK, same question: does it work? If not, what's the problem?
Again, how about moving it to your Question? you can remove old code from there -- old revisions are available...
--SA

Noel3090 8-Apr-11 14:03pm

No, am not able to retrieve posted data :(

Sergey Alexandrovich Kryukov 8-Apr-11 14:28pm

Wait, wait. To post or retrieve the posted data? Now you need to debug it. Can you debug server side? Did you get response on client side? (I understand you're not using it but you already get the response. Check what's in it. Now, where is the data you want to post? You did not put it yet, so what do you expect? Look at HttpWebRequest again. This is debugging stage, I can't debug it for you...
--SA

Sergey Alexandrovich Kryukov 8-Apr-11 14:36pm

Now, see yet another update I've added to my Answer.
I wonder why you're not trying to find out such basic things by yourself. You did not mechanically copy 100% of the sample, but certainly did not try to understand it. Simple logic should show you that if you really need to post some data (you know your actual data, I don't), you need to actually send it, and HttpWebRequest has all the members to accomplish it, just look at its help. OK?
--SA

Sergey Alexandrovich Kryukov 8-Apr-11 15:17pm

I just wonder: it that your vote of "1"?
--SA

Noel3090 8-Apr-11 15:47pm

ya i got response on client side.. but i m not getting posted data.

// string url = "http://localhost/testwebsite/default.aspx?field1=bats";
the value bats i should get, but m not getting it

Noel3090 8-Apr-11 15:48pm

ya i got response on client side.. but i m not getting posted data.

// string url = "http://localhost/testwebsite/default.aspx?field1=bats";
the value bats i should get, but m not getting it
no dint vote that

Sergey Alexandrovich Kryukov 8-Apr-11 18:53pm

OKThe "?field1=bats" is a parameter, part of URL, not POST. This is a different method of sending data, not part of POST. You need to know how the server part gets data. If you get data from POST, this is one thing, if just from URL (you shown with field1 parameter) -- another thing.
--SA

Noel3090 10-Apr-11 3:36am

If u know then please explain me , what changes should i make

Sergey Alexandrovich Kryukov 10-Apr-11 20:14pm

First you need to understand, how your Server part accepts the input: in the form of URL parameter or the Post. If the post, you have the sample code (from Microsoft). Just write your data instead.
--SA

Noel3090 11-Apr-11 14:02pm

My client is Windows mobile application, So how should i send data?

Sergey Alexandrovich Kryukov 11-Apr-11 14:38pm

I learned it many times already. Do you see the sample of sending data in my last reference?
But first, sort out the confusion: it it URL parameter or POST expected?
Here is another idea: do you have a web page which can pass this data to server (not on mobile, just via Web browser)? It does it via the form or Ajax call. If you have it, do same thing programmaticaly.
--SA