C# Discussion Boards - CodeProject

3-Nov-09 8:20

Dear Sirs,

I can't figure out the difference between Control.Validated and Control.Validating. I see the difference is that one's called, then the other's called. Here is the code I found in Control:

if (this.NotifyValidating())
{
    return true;
}
if (bulkValidation || NativeWindow.WndProcShouldBeDebuggable)
{
    this.NotifyValidated();
}

So it looks like Validating can cancel the Validated event's scheduled run by setting the Cancel field of the EventArgs, but is that the only difference? Of what use is that? Thanks.

In Christ,
Aaron Laws

http://ProCure.com

Not Active3-Nov-09 8:47

Not Active

3-Nov-09 8:47

Rather than guessing what each event does why not take the time to actually read the documentation?

control.validated[^]

control.validating[^]

I know the language. I've read a book. - _Madmatt

LimitedAtonement3-Nov-09 9:15

3-Nov-09 9:15

Dear Mr. Nischalke,

Yeah, I read that, I just can't figure out what the use might be.

In Christ,
Aaron Laws

http://ProCure.com

Christian Graus3-Nov-09 9:33

Christian Graus

3-Nov-09 9:33

It's painfully clear. When you validate, there's an event you can catch to do further validation and thus reject it. When it's been validated, there's an event so you can know if it passed or not.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Not Active3-Nov-09 9:39

Not Active

3-Nov-09 9:39

You are going to have a very difficult time in this field if something so simple throws you off.

I know the language. I've read a book. - _Madmatt

Gerry Schmitz3-Nov-09 18:51

Gerry Schmitz

3-Nov-09 18:51

One must always be vigilent so as to not become too qualified ... Smile | :)

LimitedAtonement4-Nov-09 5:11

4-Nov-09 5:11

HA! Who is in danger of being too qualified?

In Christ,
Aaron Laws

http://ProCure.com

Christian Graus3-Nov-09 8:48

Christian Graus

3-Nov-09 8:48

Well, if you think about what the words mean, validating can be cancelled as it's called during the validation process. Validated is called after.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

LimitedAtonement4-Nov-09 5:10

Record/Play .wav Files in C#

4-Nov-09 5:10

Dear Sirs,

Thanks for your sharp responses. It didn't throw me off, but it seemed a bit redundant, that's all. The clarity is indeed blinding as to what happens, but the intent is still - to me - less than clear. I'm beginning to see why this might be necessary, but I still can't think of an example. A specific example could be great, if you please.

In Christ,
Aaron Laws

http://ProCure.com

Pansy M.Arafa3-Nov-09 8:12

Pansy M.Arafa

3-Nov-09 8:12

I need to know which library or class to use to record and play .wav files in C#
please mention if the library needs to be downloaded, added or it's already inside visual studio 2005/2008
If it's a class,if it is a C# class or I need to implement it or copy its code

Thanks in advance

Re: Record/Play .wav Files in C#

LimitedAtonement3-Nov-09 8:24

are socket operations generally expensive?

3-Nov-09 8:24

A quick Google search reveals
C# MP3 Sound Capturing/Recording Component[^]
A full-duplex audio player in C# using the waveIn/waveOut APIs[^]
A low-level audio player in C#[^]

Have you checked these links?

In Christ,
Aaron Laws

http://ProCure.com

deostroll3-Nov-09 8:07

Re: are socket operations generally expensive?

3-Nov-09 8:07

I do reading and writing from/to a socket. But both are done asynchronously...I've noticed whenever my application is running, the taskmanager systray icon shows 100%, and it so happens tht my app is responsible for this too...

Paulo Zemek3-Nov-09 8:44

Paulo Zemek

3-Nov-09 8:44

In which language are you developping?
When I developped in C++ Builder (VCL, the same from delphi) I got this type of problem.
My solution was to use a home-made dll at that time, calling the API directly.

If you don't have a choice of changing the component used, try simple setting the priority of the process to a lower one. Not a real solution, but at least will make the rest of the operating system more responsible.

Re: are socket operations generally expensive?

deostroll3-Nov-09 9:27

3-Nov-09 9:27

Luc Pattyn3-Nov-09 13:27

Luc Pattyn

3-Nov-09 13:27

Hi,

if your program is using all CPU cycles, it is most likely you did something stupid in your code, such as implementing a loop that always or under certain conditions does not wait on anything (no blocking read, no time delay). Here is the simplest bad example:

while(true) {
    if (DataAvailable()) ReadData();
}

Now assume DataAvailable is a simple method that most often returns false... your loop is spinning at the speed of light, wasting all the cycles of a CPU core while not doing much useful work. Just add a Thread.Sleep(100) or so in there.

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

deostroll3-Nov-09 18:22

3-Nov-09 18:22

so whts the technique to optimize this...?

Luc Pattyn3-Nov-09 23:40

Luc Pattyn

3-Nov-09 23:40

if your code has one or more loops like the one I have shown, then using a blocking read or adding a time delay is the solution, as I have told you already.

and that is not "optimization", it is "elimination of bad mistakes".

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

deostroll4-Nov-09 2:36

4-Nov-09 2:36

Then I guess my only go is to use a ManualResetEvent...will this cause further performance problems?