C# Discussion Boards - CodeProject

KIDYA19-Jun-09 1:39

KIDYA

19-Jun-09 1:39

ya mydate is my installation date.....so if anyone change system date then that will affect on project.How to handle this?

harold aptroot19-Jun-09 2:45

harold aptroot

19-Jun-09 2:45

Don't bother, are you so greedy that you must even catch the people who go through big trouble to apply workaround that could mess up their system? Almost no one will change their system date, and the people who will aren't about to buy anything anyway. So avoiding wasting time on things like that is a bigger win.

PIEBALDconsult19-Jun-09 6:58

PIEBALDconsult

19-Jun-09 6:58

KIDYA wrote:
my installation date

If you're storing that somewhere I can probably change it, I don't even need to change the system time.

Datagridview shows same record again

harold aptroot19-Jun-09 1:31

harold aptroot

19-Jun-09 1:31

Do you really want to do that? My reaction to things like that is always to delete all traces of the program and warn my friends not to use it unless they can find a patch for it.

KIDYA18-Jun-09 23:48

KIDYA

18-Jun-09 23:48

Hello Experts!!

When i am displaying datagridview,it displayed same records 2 times.I am using dataset to display records.i dont knw why it happens??
Help me!!!

Re: Datagridview shows same record again

Christian Graus18-Jun-09 23:50

Re: Datagridview shows same record again

18-Jun-09 23:50

Well, what have you done ? Have you verified the record does not appear twice in the dataset ? It's either in the data twice, or you've done something weird when you styled the control. Without any code, and a list of things you have tried, it's hard to help.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

padmanabhan N19-Jun-09 0:46

padmanabhan N

19-Jun-09 0:46

all the records are displaying twice or any specific record is displaying....
If all the records are displaying then the problem is in your database...
check the where condition in the database....

Padmanabhan

Re: Datagridview shows same record again

CrazyCoder2619-Jun-09 2:14

CrazyCoder26

19-Jun-09 2:14

Try clearing dataset.

CC26

Set Control Values on Form from other class

Programm3r18-Jun-09 23:46

18-Jun-09 23:46

Hi all,

I have a class that performs some actions and calculations. Lets call it: class Calc
I also have a win form class called: class winForm
I want to set a label Text property on the win form from the Calc class.

How can I do this?
Many thanks in advance

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Christian Graus18-Jun-09 23:49

18-Jun-09 23:49

The calc class needs a referene to the form, or, better yet, a delegate needs to be hooked up between the two classes, so that calc can fire an event inside the form.

dan!sh 18-Jun-09 23:57

18-Jun-09 23:57

Christian Graus wrote:
a delegate needs to be hooked up between the two classes,

A delegate just to set label text? Confused | :confused:

जय हिंद

Christian Graus18-Jun-09 23:59

18-Jun-09 23:59

A delegate is the only clean way to have communication between classes. Better that, a designated event, than passing reference to forms around and exposing text properties on labels.

dan!sh 19-Jun-09 0:13

19-Jun-09 0:13

In this scenario, if Calc has only one instance thoughout and if that gets created in the form itself, then
a) would databinding the label text be enough?
b) still stick to delegates?

जय हिंद

Dave Kreskowiak19-Jun-09 4:39

Dave Kreskowiak

19-Jun-09 4:39

Who cares... The entire point is that the non-form class shouldn't have ANY knowledge of the form using it. It should not have any reason at all to modify UI controls. What if the class needs to be used by another non-form class somewhere down thte road??

The correct way to do this would be to have the Calc class expose methods, events, or delegates, that outside consumer would subscribe, or otherwise wire-up, to receive notifications that the Calc class outputs. But, these would not be manadatory subscriptions to use the class. It should be left up to the caller to determine if it needs this notification information, not the Calc class.

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Dave Kreskowiak
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Visual Developer - Visual Basic
2006, 2007, 2008

Programm3r18-Jun-09 23:59

18-Jun-09 23:59

Thanks for the response Christian.
You don't perhaps have any good links on the web referring to an example?

If not ... i do know how Google works ... just wondering.

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Christian Graus19-Jun-09 0:01

19-Jun-09 0:01

There are some good articles on delegates right here on code project, so search this site first, then google if you need to. I don't know off hand, but I know there's been a lot written about them.

You CAN just keep an instance of your form in your other class, but it's really ugly, delegates are the neat and clean way of doing what you want.

Programm3r19-Jun-09 0:03

19-Jun-09 0:03

Thanks for the info. Smile | :)

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

dan!sh 18-Jun-09 23:52

18-Jun-09 23:52

Ever heard of Properties in C#?

जय हिंद

Programm3r18-Jun-09 23:55

18-Jun-09 23:55

Hmmmm .... Let me think ... yes OMG | :OMG:

I was trying to think of a very simple example, my real scenario is a bit different.

How would one link the property with the value of the Label without checking the value of the Property each time?

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

dan!sh 19-Jun-09 2:41

19-Jun-09 2:41

Sorry. I thought this is all that needs to be done.

जय हिंद

I Believe In GOD18-Jun-09 23:54

I Believe In GOD

18-Jun-09 23:54

Class

class Class1
{
    public void ChangeTextctl ( string text , System.Windows.Forms.Control ctl )
    {
        ctl.Text = text;
    }
}

Form

Class1 cls = new Class1();
cls.ChangeTextctl("Test", button1);

Non related to the Above
P.S : if you want to change the control text from another form
then set the control modifiers as Internal . and call it from the instant

I know nothing , I know nothing ...

Christian Graus19-Jun-09 0:00

19-Jun-09 0:00

I think he wants to do it in the other direction. To do it in the direction you suggest, makes no sense at all.

Programm3r19-Jun-09 0:02

19-Jun-09 0:02

Just a quick question:

When creating a new instance of the class by calling the constructor, wouldn't you re-initialize all of the controls again? InitializeComponent();

What if you don't want that to happen?

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^