Destroying objects. - C# Discussion Boards

Re: exposing an object instance over .NET remoting

Doom-Child23-Mar-05 11:27

23-Mar-05 11:27

Alright, I've figured it out. You create an object, initialize it, then expose it using RemotingServices.Marshal. Too cool.

DC

Multi Language Interface

jawwad_jee23-Mar-05 9:32

jawwad_jee

23-Mar-05 9:32

I want to create an interface in Arabic / Urdu language in VB.Net / C#.
If if have an example, please send me to my mail address jawwad.farook@gmail.com.

I shall be thankful

Re: Multi Language Interface

TylerBrinks23-Mar-05 12:05

TylerBrinks

23-Mar-05 12:05

Everything you need is in the System.Globalization namespace. You can use resource files to hold culture-specific variations of text strings and display them based on the target language.

Plenty of examples online if you search for them.

How to handle SQL errors with severity 10

_J_23-Mar-05 9:07

_J_

23-Mar-05 9:07

how to handle sql errors with severity less then 10 in C# Confused | :confused:

.... From russia with love ....

Re: How to handle SQL errors with severity 10

TylerBrinks23-Mar-05 11:58

TylerBrinks

23-Mar-05 11:58

try
{
...
}
catch(SqlException ex)
{
...
}
finally
{
...
}

Re: How to handle SQL errors with severity 10

_J_23-Mar-05 21:23

_J_

23-Mar-05 21:23

when severity less then 10 it's an information message, so it's SqlError, and in not exists in SqlException i tried what u wrote and on error i don't go to catch block.

.... From russia with love ....

Re: How to handle SQL errors with severity 10

TylerBrinks24-Mar-05 4:16

TylerBrinks

24-Mar-05 4:16

Use @@ERROR in your SQL

Destroying objects.

paixtis23-Mar-05 8:57

paixtis

23-Mar-05 8:57

I have a 3 tier (biz data and gui layers) web app.

Should I be destroying the BLL or DAL objects after I am none using them?

How come w3wp.exe on the server keeps growing as people use the web app?

Does the fact that none is destroying the objects when they use them have anything to do with it?

We recently moved to the QC box and I am very concerned with the mem usage of w3wp.exe going up as I am testing the site. I am the only user.

Thank you in advance for any advice.

Paixtis

Re: Destroying objects.

TylerBrinks23-Mar-05 11:57

TylerBrinks

23-Mar-05 11:57

pages are destroyed for you after a page is rendered to the client. Unless you have objects in Application, Session, or Cache you don't need to destrooy anything. What you're seeing with the w3wp process should be normal. It should expand and contract in size based on use.

Re: Destroying objects.

paixtis24-Mar-05 4:18

paixtis

24-Mar-05 4:18

Thank you for your feedback.

This is also my understanding for the .Net environment.

Here is also my concern. One user (me), browing a handful of pages balloed the resources used by w3wp to 80MB. I killed the session and nothing was released.

What heppens if 5 users access thensystem at the same time? I am going to set up a similar test, but I am interested in your theory/comments.

Thanks

Paixtis

Re: Destroying objects.

TylerBrinks24-Mar-05 4:22

TylerBrinks

24-Mar-05 4:22

IIS is designed for multiple clients accessing resources at the same time. Check your IIS settings for optimization. It can handle thousands of users, certainly 5 shouldn't be an issue.

DAAB of Enterprise Library

_J_23-Mar-05 8:17

_J_

23-Mar-05 8:17

Please provide me advantages/disadvantages regarding the Data Access Application Block in Enterprise Library.

.... From russia with love ....

Re: DAAB of Enterprise Library

turbochimp23-Mar-05 16:29

turbochimp

23-Mar-05 16:29

Please avail yourself of the many sources of information on the internet. Look on the MSDN website[^], or just Google 'DAAB Enterprise Library'.
There are also probably relevant articles on CodeProject.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Need help in C#

WCH23-Mar-05 7:25

WCH

23-Mar-05 7:25

:->
I want to use picturebox control to display a image file on a dialogue with C#.I don't
know how to display any part of the image by changing the picturebox property.
Anybody can give me some help.
THANKS IN ADVANCE!

E-MAIL : LYHM5.2@GMAIL.COM Rose | [Rose]

Re: Need help in C#

Judah Gabriel Himango23-Mar-05 7:43

Judah Gabriel Himango

23-Mar-05 7:43

To display an image in the pciturebox,

myPictureBox.Image = Image.FromFile("something.jpg");

Is that what you're looking for? You might try searching CodeProject and MSDN articles before posting.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango

Re: Need help in C#

WCH23-Mar-05 7:49

WCH

23-Mar-05 7:49

Thank you for your help.I just want to partly display the image ,not all the image.
:->

Re: Need help in C#

Judah Gabriel Himango23-Mar-05 9:00

Judah Gabriel Himango

23-Mar-05 9:00

I don't think there's anything built into the framework for this; just grab the part of the image you want and construct a new image from it.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango

Interface Problems

Ox53746F6E6523-Mar-05 6:27

Ox53746F6E65

23-Mar-05 6:27

Hi!

I got a litte problem with an interface.
An interface-declaration is provided in an DLL.
Application A loads at runtime a DLL with a class that implemented the interface mentioned above.

I have got this until now:

// works perfect
object oGen= (object) Activator.CreateInstance((cGenAssembly.GetTypes())[1]);

TheInterface iInt= oGen as iInt;

if (iInt== null)
{
MessageBox.Show("Error");
}
else
{
// Do some stuff
}
I get an InvalidCastException.
If I cast the generated object into a class (for example System.Windows.Forms.Form) i can call functions.

must I cast the generated object into the correct class and afterwards i can create the interface or is there another possibility?

thanks for your help

INT 19H

Re: Interface Problems

leppie23-Mar-05 6:41

leppie

23-Mar-05 6:41

Ox53746F6E65 wrote:
TheInterface iInt= oGen as iInt;

That should be:

TheInterface iInt= oGen as TheInterface;

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Interface Problems

Ox53746F6E6523-Mar-05 6:45

Ox53746F6E65

23-Mar-05 6:45

Sorry, my fault.

But even this Method doesn't work.

53746F6E65
INT 19H

Re: Interface Problems

J4amieC23-Mar-05 9:21

J4amieC

23-Mar-05 9:21

The simple answer in that case is that the object you are creating either does not implement that interface, or it cannot be cast to an object which implements that interface.

I suggest using the debugger to determine exactly what object is returned from your Activator.CreateInstance call.

Re: Interface Problems

Joel Lucsy23-Mar-05 7:10

Joel Lucsy

23-Mar-05 7:10

If its marshalled from another appdomain, i think you need CreateInstanceAndUnwrap, or unwrap the object it gives separately.

--
Joel Lucsy

Re: Interface Problems

Ox53746F6E6523-Mar-05 7:41

Ox53746F6E65

23-Mar-05 7:41

Changed the creation code to:
object oGenForm = cCurrentDomain.CreateInstanceFromAndUnwrap("pathtodll", (cGenAssembly.GetTypes())[1].ToString());

and it still doesn't work.

53746F6E65
INT 19H

Dispose Error

JMichael246823-Mar-05 4:38

JMichael2468

23-Mar-05 4:38

I am working on an app that uses a login form. The login form touches a database to validate the user. If the user chooses a cancel button on the login form a result flag is set to false and the login form closes. The main (calling) form tests the result and if it is false then the app should exit. That is where the following error occurs.

An unhandled exception of type 'System.ObjectDisposedException' occurred in system.windows.forms.dll

Additional information: Cannot access a disposed object named "frmMain".

Here is my code:

<br />
[STAThread]<br />
static void Main() <br />
{<br />
     Application.Run(new frmMain());<br />
}<br />
<br />
public frmMain()<br />
{<br />
     InitializeComponent();<br />
     this.Show();<br />
     frmLogin frm = new frmLogin();<br />
     frm.ShowDialog();<br />
     if (frm.LoginResult == false)<br />
	Application.Exit();<br />
}<br />

What causes this, and how do I fix it?

Re: Dispose Error

mav.northwind23-Mar-05 6:04

mav.northwind

23-Mar-05 6:04

Hi!
Could it be that you're coming from a VB background? Smile | :)

Remove this.Show(); from your frmMain constructor to get rid of the ObjectDisposedException.
But your main frame will show afterwards, even when LoginResult is false.

You could do it like this:

static void Main()
{
  frmLogin frm = new frmLogin();
  frm.ShowDialog();
  if (frm.LoginResult == false)
    return;
 
  Application.Run(new frmMain());
}

Regards,
mav

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