Re: Creating a Help Form - C# Discussion Boards

Re: How to add items in listbox from database

PauloCastilho17-Apr-09 12:38

PauloCastilho

17-Apr-09 12:38

Try to use this two properties: DataValueField and DataTextField.
e.g.

<br />
//SOURCE_FROM_DB -> The method or object or ... whatever ... that has the items.<br />
myListBox.DataSouce = SOURCE_FROM_DB;<br />
//VALUE_COLUMN_NAME -> The column name of the DataSource that represents the VALUE of the item.<br />
myListBox.DataValueField = "VALUE_COLUMN_NAME";<br />
//TEXT_COLUMN_NAME -> The column name of the DataSource that represents the TEXT of the item.<br />
myListBox.DataTextField = "TEXT_COLUMN_NAME";<br />
myListBox.DataBind();<br />

How understand Dataset changes ?

Coban_17-Apr-09 3:22

Coban_

17-Apr-09 3:22

Hi all, I have a dataset which I have designed in database designer. I have desinged a form with drag drop datasources. So there is a navigator. If I change some textboxt value etc.. at run time, When I had pressed buttons on navigator (Next, Previous, First or Last) before I saved. , Can it give a message that is
"There are some changes. Do you want to save ??"

How can I understand cahnges on dataset at runtime ??

Thanks all

S.A.A

Creating a Help Form

caksabre217-Apr-09 3:14

caksabre2

17-Apr-09 3:14

Hello,

I really want to create a help page in my C# windows application and was wondering if anyone has any recommendations on best practice for this.

Cheers,

Chris

Re: Creating a Help Form

Henry Minute17-Apr-09 4:11

Henry Minute

17-Apr-09 4:11

There are plenty of examples for this on MSDN and the Web. Search for 'creating application help .NET'.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: Creating a Help Form

caksabre217-Apr-09 5:16

caksabre2

17-Apr-09 5:16

Sorry Henry, but I tried searching on that with the quotes and still didn't find anything.

Could you specify and exact page?

Thanks

Re: Creating a Help Form

Henry Minute17-Apr-09 5:24

Henry Minute

17-Apr-09 5:24

Try Googling 'creating help' or 'creating help files'. Without the quotes. Loads of hits. Take your pick.

Re: Creating a Help Form

Naruki19-Apr-09 15:53

Naruki

19-Apr-09 15:53

You could have just said "no". It's as helpful and more accurate.

Codemonkeys don't do it at all. Too busy coding.

Re: Creating a Help Form

Henry Minute19-Apr-09 23:36

Henry Minute

19-Apr-09 23:36

I disagree.
Saying no, would achieve nothing. By pointing out likely phrases to Google for the OP gets a chance to find an article that they can understand. The topic was too complex to allow a simple step by step answer, or a code snippet. Equally, my own favourite article might not have suited the OP.
This way they get to choose their own.

I had originally given what I thought was a likely phrase, the OP said it was no good, even though it was very, very similar to those suggested later. The OP had neither the wit nor intelligence to modify it for themself, in order to get more relevent responses. The topic is such a common one that there are thousands of articles on how to do it, no point in re-inventing the wheel.

simple page load query

AndyInUK17-Apr-09 2:39

AndyInUK

17-Apr-09 2:39

Hi all,

How can i call a private void abc(def ghi) method from a page load.
Here def is a abstract class.

Thank you

Re: simple page load query

Colin Angus Mackay17-Apr-09 2:45

Colin Angus Mackay

17-Apr-09 2:45

AndyInUK wrote:
How can i call a private void abc(def ghi) method from a page load.
Here def is a abstract class.

def being an astract class isn't going to make any difference that I can see. ghi is a reference to the base class def, ghi will naturally have to be a instance of a class derived from def that isn't abstract.

The issue is where is this private method located. If it is in the same class as the Page_Load then that's fine. If it is anywhere else then it isn't fine.

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Re: simple page load query

AndyInUK17-Apr-09 2:51

AndyInUK

17-Apr-09 2:51

yes it is in the same class as Page_Load. it is user control code basically.
but i am not getting the right syntax ?

i have tried calling abc(ghi). This gives me runtime error. So is something wrong with the method or i am calling it wrongly in page load

Re: simple page load query

Colin Angus Mackay17-Apr-09 2:56

Colin Angus Mackay

17-Apr-09 2:56

AndyInUK wrote:
but i am not getting the right syntax ?

Something like this?

// define ghi
def ghi = new jkl(); // jkl is derived from def
 
// make the call:
abc(ghi);

If that isn't want you meant could you explain a bit more.

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Re: simple page load query

Colin Angus Mackay17-Apr-09 3:16

Colin Angus Mackay

17-Apr-09 3:16

That was odd... Your message just disappeared. Here is my response to it.

AndyInUK wrote:
So how to create instance of this abstract class ?

You cannot make an instance of an abstract class. Marking a class as an abstract is telling the compiler that you don't want anyone creating an instance of it. You must derive from an abstract class and make an instance of that.

AndyInUK wrote:
And how did the jkl derived from abc?

public abstract class abc
{
    // You class content goes here
}
 
public class jkl : abc // jkl is derived from abc
{
    // Your class content goes here
}

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Re: simple page load query

Eddy Vluggen17-Apr-09 3:24

Eddy Vluggen

17-Apr-09 3:24

AndyInUK wrote:
yes it is in the same class as Page_Load. it is user control code basically.

Is it part of the page, or part of that user-control? If it's private to the user-control, you won't be able to call it from outside that user-control.

I are troll Smile | :)

Re: simple page load query

Colin Angus Mackay17-Apr-09 5:14

Colin Angus Mackay

17-Apr-09 5:14

Weird... Another message disappears just as I'm replying to it...

AndyInUK wrote:
There are various methods derived in abstract class

That doesn't make any sense.

You derive a class. You override methods. Or you make methods virtual (available for overriding) or abstract (mandatory for overriding)

AndyInUK wrote:
I am unable to find such derived class.

If I knew what you were talking about rather than naming things after sequential groups of letters it might make more sense.

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Reading files

satsumatable17-Apr-09 2:20

satsumatable

17-Apr-09 2:20

Hi,

I'm trying to read a file which is present in remote PC (basically i've created a logical drive in my local system and mapped it) it works well during debug mode but it doesnt work in the release mode (when i install the project).

Do i need to set any permissions? It is C# Windows Application.

Thanks

Re: Reading files

Colin Angus Mackay17-Apr-09 2:22

Colin Angus Mackay

17-Apr-09 2:22

satsumatable wrote:
it doesnt work in the release mode (when i install the project).

How, exactly, does it not work? Does it produce an error? If so what? If not how can you tell it isn't working?

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Re: Reading files

satsumatable17-Apr-09 2:27

satsumatable

17-Apr-09 2:27

It throws an error as like below

It is saying part of the file path is not found.

Re: Reading files

stancrm17-Apr-09 2:29

stancrm

17-Apr-09 2:29

probably you call like "myfile.exe". That means, if you change the directory, then the file is not there anymore.
Try to call using fullname, like "c:\mydir\myfile.exe".

Re: Reading files

stancrm17-Apr-09 2:28

stancrm

17-Apr-09 2:28

use try catch, show the exception message, then you can see what's wrong with your application.

Re: Reading files

satsumatable17-Apr-09 2:31

satsumatable

17-Apr-09 2:31

file path is exactly going like "c:\mydir\myfile.exe"

Re: Reading files

stancrm17-Apr-09 2:36

stancrm

17-Apr-09 2:36

try to show your path+file in a messagebox, just find it, whether the file exists or not.

Re: Reading files

Alan Balkany17-Apr-09 3:42

Alan Balkany

17-Apr-09 3:42

You need to put a '@' before the string to handle the back slashes correctly:

@"c:\mydir\myfile.exe"

A security exception was not handled in your code

lachu00917-Apr-09 2:07

lachu009

17-Apr-09 2:07

Hi,

I got an error "A security exception was not handled in your code" when i try to open a page using server.transfer.But when changed the application server it worked perfectly. what could be the issue? Is it an IIS configuration issue ,Server configuration issue or any other..

Thanks in advance

cross thread operation not valid, when closing a windows form

But_Im_a_Lady17-Apr-09 1:19

But_Im_a_Lady

17-Apr-09 1:19

Hi All,

After spending ages on google trying to understand & recify my problem, and having no success, I am hoping someone here can point me in the right direction.

Here is my problem...

I have a windows form, which has a selection of standard toolbox controls and custom User controls, some of which are added at design time & some of which are added at run time.

This all works fine, but when I close the form I get this message:-

"Cross-thread operation no valid: Control 'chkShowSparesMatrix' accessed from a thread other than the thread it was created on".

This control is a standard MS check box which is added at design time. None of its properties are changed in code, the only event which is acted upon is 'checkedchanged':-

private void chkShowSparesMatrix_CheckedChanged(object sender, EventArgs e)
{
    if (chkShowSparesMatrix.Checked)
    {
        usrSparesMatrix1.IsStandAlone = false;
        usrSparesMatrix1.Visible = true;
    }
    else
    {
        usrSparesMatrix1.IsStandAlone = false;
        usrSparesMatrix1.Visible = false;
    }
}

If I remove this control, I get the same message on another control.

If anyone can throw light on this for me I would be grateful, or if you need more info to understand my problem I can forward you this.

Thanks in advance,

Janet

Lady Programmers are a rare breed!

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.