Re: Difference b/w dispose() & finalize() - C# Discussion Boards

Re: DllImport and cstring

Saamir31-Aug-07 4:15

Saamir

31-Aug-07 4:15

Hi leppie, What do you mean by original thread, this is the only thread I have.

Please respond to this.

Thanks

S

sasa

Re: DllImport and cstring

leppie31-Aug-07 5:02

leppie

31-Aug-07 5:02

Hehe sorry, I was referring to this one http://www.codeproject.com/script/comments/forums.asp?msg=2206354&forumid=1649#xx2206354xx[^] D'Oh! | :doh:

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Re: DllImport and cstring

Saamir31-Aug-07 5:16

Saamir

31-Aug-07 5:16

Thank you for your response. I get the error saying Methods type signature is not pinvoke compatible. Any ideas?

S

sasa

ListBox

minniemooo31-Aug-07 3:12

minniemooo

31-Aug-07 3:12

hi,
How do I add numbers in a listBox?
eg. I have a list of numbers in my listbox and I want to add them and place the result in a textBox.

Re: ListBox

pmarfleet31-Aug-07 3:47

pmarfleet

31-Aug-07 3:47

Use a variable to maintain a running sum. Iterate through each item in the listbox. For each iteration, convert the value of the current item to a number and add its value to the current value of the running sum variable. Finally, write the value of the running sum variable to your textbox.

Paul

Re: ListBox

\laddie31-Aug-07 4:31

\laddie

31-Aug-07 4:31

Here is the code if you require Smile | :)

int sum =0;

for(int i=0;i

Difference b/w dispose() & finalize()

Dineshraj31-Aug-07 1:48

Dineshraj

31-Aug-07 1:48

What is the difference between dispose() and finalize()methods in c#?

Re: Difference b/w dispose() & finalize()

Colin Angus Mackay31-Aug-07 2:00

Colin Angus Mackay

31-Aug-07 2:00

Dineshraj wrote:
dispose() and finalize()methods in c#?

Dispose() is an implementation of the IDisposable interface. It is used to clean up unmanaged resources from an object when it is no longer needed. You explicitly call the Dispose method.

The Finalize method (using the destructor syntax in C#) is called when the Garbage collector cleans up the object. It should not be created unless needed as it slows garbage collection. If it is needed it most likely will call the Dispose method (so that all your clean up code is in one place). You have no control over when the finaliser is called.

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Re: Difference b/w dispose() & finalize()

martin_hughes31-Aug-07 2:48

martin_hughes

31-Aug-07 2:48

Does this mean that explicity creating a destructor, say:

~MyClass()
{
   ...
}

is just a different way of writing:

protected override void Finalize()
{
   ...
}

"It was the day before today.... I remember it like it was yesterday."

-Moleman

Re: Difference b/w dispose() & finalize()

Pete O'Hanlon31-Aug-07 3:12

Pete O'Hanlon

31-Aug-07 3:12

The ~ syntax will implicitly call the finalizer.

Deja View - the feeling that you've seen this post before.

Re: Difference b/w dispose() & finalize()

Pete O'Hanlon31-Aug-07 2:07

Pete O'Hanlon

31-Aug-07 2:07

Dispose is a method on an interface (IDisposable) that tells you that you can free up some resources. It is not guaranteed to be called, but can be called either explicitly via the MyObject.Dispose method, or implicitly when the instance has been wrapped in an using block, e.g.

using (SqlConnection conn = new SqlConnection())
{
 ..
}  // The Dispose method will have been called here.

The finalizer is run by the garbage collector, so you have no idea when it will run (under normal conditions that is - it is possible to explicitly call a Finalizer, but this is generally bad practice). Now, if you implement IDisposable.Dispose() then it is normally good practice to suppress the Finalizer. This is done by calling the method GC.SuppressFinalize() in the Dispose method. To this end, I tend to write a message to the trace logs if I get into a Finalizer when I have a Dispose method. By doing this, I can see where I haven't freed up resources explicitly.

Deja View - the feeling that you've seen this post before.

Re: Difference b/w dispose() & finalize()

Colin Angus Mackay31-Aug-07 3:12

Colin Angus Mackay

31-Aug-07 3:12

Pete O`Hanlon wrote:
To this end, I tend to write a message to the trace logs if I get into a Finalizer when I have a Dispose method. By doing this, I can see where I haven't freed up resources explicitly.

Now that is an excellent idea!

Re: Difference b/w dispose() & finalize()

Vasudevan Deepak Kumar31-Aug-07 2:31

Vasudevan Deepak Kumar

31-Aug-07 2:31

There is some good discussion here:

http://www.codeproject.com/dotnet/GC_101.asp?df=100&forumid=34269&exp=0&select=1408298[^]

Vasudevan Deepak Kumar
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Re: Difference b/w dispose() & finalize()

Scott Dorman31-Aug-07 8:18

Scott Dorman

31-Aug-07 8:18

First of all, you generally don't want to write a finalizer unless you really need to. There are a lot of rules that should be followed in a finalizer and a lot of assumptions that can normally be made about the state of the objects and the runtime are not valid inside a finalizer. They add a cost to your object as well, even if the finalizer is never called.

That being said, as others have pointed out, Dispose is part of the IDisposable interface and helps implement the Dispose pattern. This pattern provides an explicit method for cleaning up resources.

A finalizer provides for implicit cleanup and, if your class has one, will be automatically called at some non-determistic time as part of the garbage collection process.

Scott.

—In just two days, tomorrow will be yesterday.

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Re: Difference b/w dispose() & finalize()

Scott Dorman31-Aug-07 8:19

Scott Dorman

31-Aug-07 8:19

Forgot to mention, you can also take a look at this article that explains how to implement IDisposable and the Dispose pattern.

http://www.codeproject.com/useritems/idisposable.asp[^]

Scott.

—In just two days, tomorrow will be yesterday.

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Receiving Mail from an Exchange Server

Programm3r31-Aug-07 1:20

Programm3r

31-Aug-07 1:20

Hi all,

I'm trying to get all the mail from an exhange server, can anyone please help me (namespaces, classes functions) Confused | :confused:

?

Many thanks
Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
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Re: Receiving Mail from an Exchange Server

Vasudevan Deepak Kumar31-Aug-07 2:30

Vasudevan Deepak Kumar

31-Aug-07 2:30

http://www.codeproject.com/csharp/gmcdoexmail.asp[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

how use Line Break in Gios PDF .NET library [modified]

sanjeevRanjan31-Aug-07 1:07

sanjeevRanjan

31-Aug-07 1:07

I have used Gios PDF .NET library for PDF creation. My requirement is that, i dont want to create new page evary time for new tables, i have to use 2 line break after each table in PDF Page. is it possible to write multiple tables on same PDFPage using 2 line break after each tables.(I want to avoid unnecessary spaces on PDFPage).

Please send me source code in C#.net, thanks in advance.

Thanks,
Sanjeev Ranjan

-- modified at 9:09 Friday 31st August, 2007

Re: how use Line Break in Gios PDF .NET library

Vasudevan Deepak Kumar31-Aug-07 2:34

Vasudevan Deepak Kumar

31-Aug-07 2:34

If you have posted this in the Article's MessageBoard (http://www.codeproject.com/cs/library/giospdfnetlibrary.asp[^]), the author will also know of your query and can respond better.

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

query string encryption

Sonia Gupta31-Aug-07 1:05

Sonia Gupta

31-Aug-07 1:05

i have to pass the username name and password to another form using the query string.
Is there any way to encrypt the query string ? So that the data can we secured

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: query string encryption

Pete O'Hanlon31-Aug-07 1:08

Pete O'Hanlon

31-Aug-07 1:08

This is never a good idea. Even with encrypted text, the query string is still going to be visible thereby allowing somebody else to steal and use the query string.

Deja View - the feeling that you've seen this post before.

Re: query string encryption

Sonia Gupta31-Aug-07 1:32

Sonia Gupta

31-Aug-07 1:32

i know it will be visible , but the information will not be directly visible to others

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: query string encryption

Pete O'Hanlon31-Aug-07 1:58

Pete O'Hanlon

31-Aug-07 1:58

As it is transmitted over a network it will be visible to others (packet sniffers etc). Never design security like this - especially as this info is text encoded.

Deja View - the feeling that you've seen this post before.

Re: query string encryption

Vasudevan Deepak Kumar31-Aug-07 2:33

Vasudevan Deepak Kumar

31-Aug-07 2:33

Use session to hold such confidential data. You may like to check out XCrypt (http://www.codeproject.com/csharp/xcrypt.asp[^])

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

asp.net panel like code project

mfmaneef31-Aug-07 1:02

mfmaneef

31-Aug-07 1:02

hello,

is there any specific control in asp.net which we can use somethign like in codeproject sections navigations menu in left corner which expands when we click a main category? please give me some idea about these. Big Grin | :-D

aneef

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