Re: database question - C# Discussion Boards

Receiving same udp datagram twice

14-Aug-05 23:13

General rule use smallest datatype as you need
smallest will run faster
look at this article may help you

Data Type Performance Tuning Tips for Microsoft
[^]

MCAD

PatteOne14-Aug-05 19:57

PatteOne

14-Aug-05 19:57

Hi!
When I try to send udp-packets broadcasted in my local LAN by this code:

<br />
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);<br />
s.SendTo(Encoding.ASCII.GetBytes("Some text to send"), new IPEndPoint(IPAddress.Parse("192.168.0.255"), 11000));<br />

And do the receive with this:

<br />
client = new UdpClient(11000);<br />
IPEndPoint EP = new IPEndPoint(IPAddress.Any, 11000);<br />
byte[] buffer = client.Receive(ref EP);<br />

I always get two messages received! My explanation for this is, that udp is connectionless and by broadcasting it it's returned by some other device - I don't know.. Can you explain it to me and give a tip how to avoid it?

System.Windows.Forms.ListBox .net 2.0 problem

Shane Stevens14-Aug-05 17:54

Shane Stevens

14-Aug-05 17:54

Hi,

Is it just me or does the ListBox class in .net 2.0 exhibit some odd behaviour?

For instance, when I use the mouse wheel to scroll it seems to do some weird redraw-from-the-top update method.

Also, it flickers like crazy when resizing. I've tried enabling the double buffering mode to no avail. I have overridden it to draw icons next to the text which works fine, but it seems to clear the entire background, not just the dirty area, every time.

As a sanity check I then placed a stock ListBox control on a new form to see if it works in its standard mode but it exhibited the same symptoms. The odd thing is it doesn't do this with .net 1.1. Confused | :confused:

Does anyone else suffer from this or know of a solution?

Regards,
Shane

Shane Stevens
Technical Director
Blue Tongue Entertainment
www.bluetongue.com

database question

nidhelp14-Aug-05 15:18

nidhelp

14-Aug-05 15:18

hi
im using MS access database to keep my data and using visual studio .net 2003 to design forms...

i want to know how to retrieve data from access to my forms in visual studio .net.. what codes must i write in visual studio .net or must i use some access wizard to do what i want?

thanks!

Rob Graham14-Aug-05 16:29

Rob Graham

14-Aug-05 16:29

see System.Data.Oledb Namespace[^]

Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

nidhelp14-Aug-05 20:53

nidhelp

14-Aug-05 20:53

ok, now i want to check with you>
where do i write my codes to connect to my database from within my app? do i write the codes in a new form or the form i've been using all along to create my app?

thanks!

Mohamad Al Husseiny14-Aug-05 23:20

14-Aug-05 23:20

nidhelp wrote:
ok, now i want to check with you>
where do i write my codes to connect to my database from within my app? do i write the codes in a new form or the form i've been using all along to create my app?

if you have to get many data when you start your appliactio use splash screen to connect and get the data
and when the you got the data show the form that deal with data
But general rule try to separate the code that access and manipulate the database and put it in dll and call it from your win forms

MCAD

System.Activator question..?

tatchung15-Aug-05 0:19

tatchung

15-Aug-05 0:19

Its more of a preference for the programmer but security-wise and readability i agree it has to be put in a different form. I usualy do my queries in a different form, pass it to another dll for sorting, editing, etc then finally pass it to my win app or web app.
Hope that helps!

Kampai!!!

Besinci14-Aug-05 11:42

Besinci

14-Aug-05 11:42

Hi, examine the following code.. for my puspose it works fine..
but, -How do I check 'myType' realy exists ???

public static object Construct(Type myType)
{
return System.Activator.CreateInstance(myType);
}

Re: System.Activator question..?

DavidNohejl14-Aug-05 12:26

DavidNohejl

14-Aug-05 12:26

What do you mean? If you get that type as argument myType it does exist Confused | :confused:

If you mean something like System.Activator.CreateInstance("MyType",...); then it throws exception as described in MSDN[^]

You can use Assembly.GetType Method (String)[^] to determine if type is in assembly, it returns null if type wasn't found.

Never forget: "Stay kul and happy" (I.A.)

David's thoughts / dnhsoftware.org / MyHTMLTidy

System.net.Mail default smtp host

oOomen14-Aug-05 10:57

oOomen

14-Aug-05 10:57

i was using the old system.web.mail classes.
and try to sent emails with net.mail, but i get an exception:

System.Net.Mail.SmtpFailedRecipientException was unhandled by user code
Message="Mailbox unavailable. The server response was: 5.7.1 Unable to relay for bla@bla.bla"

host property of SmtpClient must be set up! but what is default smpt host? is it "localhost"? i get an exception if i use it.

if i use this code it work for me (System.Web.Mail):

SmtpMail.SmtpServer = null;

SmtpMail.Send(mail);

because the name of the local SMTP server is used!!!!!!

WHAT NAME IS IT? how can i find it out?
i need the name to set the property Host of SmtpClient (System.Net.Mail).
thanks

thank u for ur advice

Re: System.net.Mail default smtp host

Bounz14-Aug-05 11:11

Re: System.net.Mail default smtp host

14-Aug-05 11:11

You have to specify SMTP-server, which you will use for sending mail...
I did following:
myClient = new SmtpClient(serverName, Convert.ToInt32(serverPort));
where serverName is IP-adress of SMTP-server.

--
Digitally yours, Bounz

Vasudevan Deepak Kumar15-Aug-05 0:28

Vasudevan Deepak Kumar

15-Aug-05 0:28

Bounz wrote:
myClient = new SmtpClient(serverName, Convert.ToInt32(serverPort));

You may use IPAddress or the Dns Name of the server also. But the quicker trick would be CDOSys can be configured to relay to the local server and have the local server relay to a SmartHost in the network, which would do all relay, authorization checks etc to send the mail.

That way, our application is freed up from using a slow costly network communication resource through its process.

Vasudevan Deepak Kumar
Personal Web: http://www.lavanyadeepak.tk/
I Blog At: http://deepak.blogdrive.com/

Re: System.net.Mail default smtp host

Vasudevan Deepak Kumar15-Aug-05 0:24

Vasudevan Deepak Kumar

15-Aug-05 0:24

This is a duplicated post. You have also posted in ASP.NET and I have answered it there.

The URL to refer for your doubt is: http://www.systemwebmail.com/[^]

Vasudevan Deepak Kumar
Personal Web: http://www.lavanyadeepak.tk/
I Blog At: http://deepak.blogdrive.com/

not case-sensitive string.Replace()

Bounz14-Aug-05 10:27

14-Aug-05 10:27

How can i perfom case-NONsensitive replacing in string? Advice, please..

--
Digitally yours, Bounz

Guffa14-Aug-05 10:29

Guffa

14-Aug-05 10:29

You could use a regular expression.

---
b { font-weight: normal; }

Bounz14-Aug-05 10:46

14-Aug-05 10:46

Give an example, please. Blush | :O

I want Replace() to find "thurman" in "Uma Thurman"... How can I implement this?

--
Digitally yours, Bounz

Mohamad Al Husseiny14-Aug-05 10:51

14-Aug-05 10:51

pattern like [Tt]hurman will work

Regex rx=new Regex("[Tt]est");
string strRep=rx.Replace("Test test testable Mohhahahah","XZXXX");
MessageBox.Show(strRep);

MCAD

Bounz14-Aug-05 11:21

14-Aug-05 11:21

thanks a lot to all..
i found answer:
i have to use

Regex rx = new Regex("(?i)WhatIWantToReplace"); <br />
string strRep = rx.Replace("TextInWhichReplace", "WithWhichReplace");

--
Digitally yours, Bounz

Mohamad Al Husseiny14-Aug-05 11:29

14-Aug-05 11:29

if you dont know the first character use
[\ws] which mean any character
so pattern would be like this [\ws]est
which will match test and best and so on

MCAD

Guffa14-Aug-05 12:03

Guffa

14-Aug-05 12:03

Simply:

string result = Regex.Replace("Uma Thurman", "thurman", "whatever", RegexOptions.IgnoreCase);

---
b { font-weight: normal; }

Bounz15-Aug-05 9:14