TCP/IP connexion failed in csharp smart device

[Lost User]

Tunisien86 wrote:

I am not so good at english informatic vocablary.

Your English is fine, but there's a mixup in classes that act and look similar. The one on the mobile device has an .sdf-extension and is a file-based datastore. You've already worked with this type of database. Typically, you make a SqlCeConnection[^] and execute a SqlCeCommand[^]. The database on Sql Server has a .mdf extension, and is a server-based datastore. It works in a similar fashion, you open a SqlConnection[^] and execute your SqlCommand[^] In short, when you talk to .sdf you use a SqlCeConnection, when you talk to an .mdf you use a SqlConnection. The long story can be found on MSDN[^].

I are Troll :suss:

[Tunisien86]

Hi Eddy, Thanks a lot for u collaboration :).I understand u meaning.I make changement but still not working. My new code is like that:

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

namespace ModeDifféré
{
public partial class Form6 : Form
{
public Form6()
{
InitializeComponent();
}

    private void comboBox1\_SelectedIndexChanged(object sender, EventArgs e)
    {

    }

    private void Form6\_Load(object sender, EventArgs e)
    {
        string sConnection = "Data Source=192.168.1.4,1433;Initial Catalog=GMAO;User ID=sa;Password=sa;";
        string sSQL = "SELECT DISTINCT \* FROM D°\_urgence";
        SqlCommand comm = new SqlCommand(sSQL, new SqlConnection(sConnection));
        SqlDataReader dr = null;
        try
        {
            comm.Connection.Open();
            dr = comm.ExecuteReader();
            while (dr.Read())
                comboBox1.Items.Add(dr\[0\]);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
            return;
        }
        dr.Close();
        comm.Connection.Close();
    }
}

}

In fact,my combobox should contain the result of my select statement,but when running,the system is show an sqlexception and nothing is added to my combobox. Is the IPadress the problem?the ipconfig command returns to me this:

C:\Users\Admin>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Admin-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 06-1B-9E-4A-A0-8C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR5007EG Wireless Network Adapter

[Tunisien86]

Hi Calla, Eddy suggests that i change sqlcecommand to sqlcommand because I use .mdf database. Or i don't know maybe i am not understanding what he said :laugh: Thanks

[Luc Pattyn]

don't use

catch (Exception ex) {
    MessageBox.Show(ex.Message);
}

as it may hide a lot of useful information. Instead use

catch (Exception ex) {
    MessageBox.Show(ex.ToString());
}

at least as long as it is not working properly all the time. :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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[Tunisien86]

Hi Luc, I made the changement u ask but the exception still.I wanna clarify that I wanna connect to my database .mdf and not .sdf.Something still not clear in my mind why should i use .mdf database or I work a mobile application so .sdf database required??,:mad: Thanks for u contribution :((

[Luc Pattyn]

Tunisien86 wrote:

but the exception still

what did you expect? it does not make the exception go away, it makes you get more information from it, so you have a better chance at understanding what goes wrong and where. X|

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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Prolific encyclopedia fixture proof-reader browser patron addict?
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[Pete OHanlon]

Is the remote instance really 192.168.1.4 or is it 192.168.1.4\SQLExpress? By default SQLExpress databases run under a SQLExpress instance, and this is what you need to connect to.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

[Michel Godfroid]

You'll have to check 1) Do you have network connectivity on your emulator: start Internet explorer on the emulator, and try to access a well known website (www.codeproject.com). 2) Is your firewall open on port 1433? Also, which exception are you getting now? we need the full text of the exception, which you should now have, if you followed Luc Pattyns' code.

[Tunisien86]

Hello, I have an sql server 2005 standart Edition and not express.A snapshot of my sqlexception is available at this link http://yfrog.com/iycaptureawj[^] Thanks

[Michel Godfroid]

If I follow the code in the article he refers to, he would have dumped the instance browser, and locked SqlExpress to port 1433.

[Michel Godfroid]

Ah the joy of developing for mobile! X| We can't read the full exception (your screen is too small). Put a breakpoint at the exception statement, and examine the 'ex' variable when the expression occurs.

[Tunisien86]

Hi Micheal, As a reponse of u suggestions: 1)my emulator doesn't have network connectivity. 2)how can i know that my firewall is open on port 1433? 3)the sqlexception I got :http://yfrog.com/iycaptureawj[^] Thanks :)

[Lost User]

Tunisien86 wrote:

In fact,my combobox should contain the result of my select statement,but when running,the system is show an sqlexception and nothing is added to my combobox.

It's easier to find a problem if you include the message of the exception. In this case it's probably caused by a common error - your tablenames contain illegal characters. You can "fix" it with brackets;

string sSQL = "SELECT DISTINCT * FROM [D°_urgence]";

Also note that the change in code assumes that your select-statement is run against an SQL Server instance, one that has access to the *.mdf-file that you want to read from. If this data is stored locally, in an *.sdf file, then you'd indeed need the SqlCe-classes.

Tunisien86 wrote:

Or should I take the physical @ as the @ of my computer?

Ideally, you take the computers' name and the instance name and put it in a configurationfile. Something like "Admin-PC/MySql2005Instance". There might be lots of IP-adresses on a computer, but it usually only has a single name that identifies it in the network. It also communicates easier, imagine yelling "Reboot Skynet and Idefix" in contract to "Reboot One-Nine-Two Doht One-Six-Eight Doht One Doht Zero.. - No Four, I meant Four!" :cool:

I are Troll :suss:

[Pete OHanlon]

Try changing your connection string to

Data Source=192.168.1.4,1433;Network Library=DBMSSOCN;Initial Catalog=GMAO;User ID=sa;Password=sa

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

[Michel Godfroid]

Tunisien86 wrote:

the sqlexception I got :http://yfrog.com/iycaptureawj\[^\]

Yeah, that one we've already seen. try to get the full exception ON THE PC (see my other reply about this)

Tunisien86 wrote:

my emulator doesn't have network connectivity.

Well, there you have it. No point in testing the others until you can establish that. 1) Is your emulator cradled? 2) do you see the connection in Mobile device center or in ActiveSync?

[Tunisien86]

Hi Eddy, I wanna clarify something.The database I would connect to is the database of the society I work in.As u know,maintenance societies try try to make easy its work:a technician uses the PDA to connect to the database of the society and finishs his work.The "big" database is a .mdf file.Something was not clear how can i connect to .mdf databse while i should connect to .sdf fine because I develop a mobile application??Is that possible Also about the ip@,is it true what i did?I don't understand u statement really :) is it a problem of Firewall???? Thanks

[Tunisien86]

Hi Pete, I changed but the sqlexception still:

Unknown connection option in connection string: network library.

thanks

[Tunisien86]

Hi Michel, when running the exception is :

NULLREFERENCEEXCEPTION IS UNHANDLED
Null ReferenceException

and it point to this statement of my code:

dr.Close();

Thanks

[Michel Godfroid]

No, that's another exception. It happens because your try block never executed succesfully. put a breakpoint at MessageBox.Show(ex.Message); and look at the value of ex then (with the debugger)

[Tunisien86]

Hi Michel, My emulator is not cradling.When googling,I found this link talking about how to cradle an emulator:http://netcf2.blogspot.com/2005/11/getting-started-using-emulator.html[^] I wanna ask should I use a real PDA?is the emulator enough? Thanks