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I believe that most of the messengers use UDP for communication! Or am I wrong? 
But still, yes, UDP is unreliable whereas TCP is. So I guess its a choice between speed and reliability.. 
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
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Save My Soul - (SMS) wrote: Protocol wise, I think UDP is better for Messengers as they are fast.
 It's a chat application! Who cares about the .0005 seconds faster the 1 or 2 message packets would take get there! In a chat app, reliablility is better than the negligable "speed" gain you get.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Is your app communicating over the web or just a lan.
If communicating over the web you may want to read up on SOAP web services....
i myself have been working on a messenger app i have gotten pretty far but
not a client/server app
each node is sort of a client and server itself.
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I agree. This way seem much more logical.....
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
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What it when clicking the Reply link! Make sure your replying to the correct post.
I'm not the one writing a chat app...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Ok, Ok.... Use TCP.... Look, I just read somewhere that chat Apps usually use UDP for communication, OK. 
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
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That's true, most of them do. But in the OP's requirements, reliable delivery requires TCP, because UDP doesn't guarantee that the packets will make it to the recipient, let alone in the orrect order.
Read up on the protocols before you start making recommendations about their use!
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I did know that UDP was unreliable but didn't know that it was unreliable to this extent that we couldn't trust it. Thanks for pointing that out.
If UDP is so unreliable, why the hell is it there and what type of applications use it??
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
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Save My Soul - (SMS) wrote: If UDP is so unreliable, why the hell is it there and what type of applications use it??
Streaming media.
UDP is connectionless, so you don't expect any acknowledgements back from the client, or multiple clients in broadcast. There are no retrys on packets that are lost since the send never gets notified that they've been dropped or recieved out of order. Since this is where TCP gets "bogged down", if you could call it that, UDP is a little faster.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I receive this error
"An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
Here is my connection string
Data Source=SQLEXPRESS; Initial Catalog=dbEasyManager; User id=sa; Password=;
i even had data source = localhost
Came across enabling pipes in sql config manager, but i have no idea where that is in the manager cant find it
that may not even be the problem, because i had connected to the db before with someone elses code just dont know where it is.
can someone help me please
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kourvoisier wrote: Data Source=SQLEXPRESS
This tells it to look for the SQL Server on a machine called SQLEXPRESS. I suspect that this is the instance name and you just haven't told it which machine on your network to find that instance of SQL Server.
Try:
Data Source=MachineName\InstanceName
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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Colin Angus Mackay wrote: Data Source=MachineName\InstanceName
I still get the same error.
here is connection string i used among others
"Data Source=./SQLEXPRESS; Initial Catalog=dbEasyManager; User id=sa;Password=;"
after adding a connection thru database explorer, by browsing thru the files and selecting the actual database, it stated i made a successful connection. It then generated a connection string.....(below)
Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Program Files\MicrosoftSQLServer\MSSQL.\MSSQL\Data\dbEasyManager.mdf";Integrated Security=True;ConnectTimeout=30;UserInstance=True
I was going to test this connection string in my code but couldnt figure out how to make the whole thing a string with the extra ""'s in it throws the syntax off.
Bottom line is i still cant connect to my database
I am using SQL server 2005 express and
visual 2005 c# express on a windows xp machine
the name of my database is dbEasyManager.mdf
someone help me, is there any other info you need to get me connected, its got to be something little i just cant figure it out.
HELP
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server=(local)/SQLExpress;database=Pubs;Integrated Security=true
Error i get because of the slash "/" --> Unrecognized escape sequence
why is this?....
on tutorials they have it setup this way but when i compile i get this error...
someone help me.
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After a couple of days of trying to figure this thing out i did!
something very simple, i knew it would be
in my connection string the "unrecognized escape sequence" error i was getting was because
c# does not like the "/" character one bit, so before your string you must use the @ symbol
to make c# happy.
and WHALA!!! works like a charm
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Hello,
I am beginner in c#.net, i need your help.Now i am in a problem i want to delete a folder with data in my c# application.Can you help me please.
Thanks in advance.
alex.
Help me
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how i can control electric items through c# application?
need some help from u people.
Sheharyar_JH
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By sending data over WiFi, or serial bus, or parallell port or USB, or internet, having your 'electric item' connected to the correct media over which you are sending your commands. Adjust the item so that it can interpret any command you send to it. Make sure your item is powered. And that should pretty much do it.
(more specific questions might result in more specific answers btw)
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Because the question was SOOOO vague, with an utter lack of any detail, that it was the only answer possible! 
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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The technology you are refering to is called X10. It is aimed at controlling household appliances thru you computer.
MS recently posted an article on doing exactly this on their 'codeforfun' website. Sorry, no link, but you should find the answers you are looking for. 
xacc.ide-0.1.1 released! :) Download and screenshots
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Hi all, idont know where am i going wrong please help me.My idea is that, i am retrieving the deptnames from database into the dropdown list and afterthe selection of the deptname the respective details are to be displayed on the datagrid. The code is working till the dropdownlist.
code to get deptnames to the dropdownlist:
private void Page_Load(object sender, System.EventArgs e)
{
try
{
connectdb();
Cmd.CommandText = "Select distinct (Dept) from emp";
da.SelectCommand = Cmd;
da.Fill(ds,"Emp");
DropDownList1.Items.Clear();
foreach (DataRow dr in ds.Tables["emp"].Rows)
{
DropDownList1.Items.Add(dr["Dept"].ToString());
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
Con.Close();
}
code to dispaly the details onto datagrid:
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
try
{
connectdb();
Cmd.CommandText = "Select * from emp Where Dept Like '" + DropDownList1.SelectedItem.Value.ToString() + "' order by Empno";
da.SelectCommand = Cmd;
da.Fill(ds,"Emp");
DataGrid1.DataSource = ds;
DataGrid1.DataMember = "Emp";
DataGrid1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
Con.Close();
}
Note: The same code is working if i enter the deptname in a textbox and click the button to display details on to the datagid. But the code is not working if i select the option in the dropdownlist.Is the event Dropdownlist_SelectedIndexChanged relevent or any other events are there to select the dropdownlist.
pleasehelp me
thanks in advance
yamini
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Hi,
By default AutoPostBack property for dropdown list is set to false, set the AutoPostBack property to true
Thanks
Warm Regards
Prakash-B
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Can anyone give me the exact difference between Virtual and Override? I am a bit confused... 
Bikash Rai
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