Re: Help Button - C# Discussion Boards

25-Jul-07 7:42

You have to use the KeyPressed event handler and change the keypress to what you want.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Change KeyValue

Thaer Hamael25-Jul-07 7:53

Thaer Hamael

25-Jul-07 7:53

thanks mr Paul Conrad but this events do not correct events becouse

this event do not supplay just e.KeyChar and the Enter Key do not have Char and i cont change the key value
Rose | [Rose]

Thaer

Re: Change KeyValue

Paul Conrad25-Jul-07 8:04

25-Jul-07 8:04

You should be able to change e.KeyChar, Enter does, it is ascii 13...

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Help Button

RussBus25-Jul-07 6:28

25-Jul-07 6:28

Does anyone know what is called when you click this button:

http://davidkean.net/images/helpwindow.jpg

I want to use that help button but don't want to turn max and min off on the title bar.

Guffa25-Jul-07 6:34

Guffa

25-Jul-07 6:34

For some unknown reason they have chosen the highly illogical name HelpButton for that. Wink | ;)

You have to turn the minimise and maximise buttons off for the help button to show up.

---
single minded; short sighted; long gone;

RussBus25-Jul-07 6:40

25-Jul-07 6:40

Yeah see what I want to do is us the help button without turning the min and max buttons off. So I want to link it to another button on my form, thus trying to figure out how it is called. Wink | ;)

Guffa25-Jul-07 8:56

Guffa

25-Jul-07 8:56

RussBus wrote:
Yeah see what I want to do is us the help button without turning the min and max buttons off.

Yes, you said that in your first post, and I said that it's not possible.

RussBus wrote:
So I want to link it to another button on my form, thus trying to figure out how it is called.

What do you plan to "link", and how do you plan to "link" it?

If you want a button on the title bar you have to place it there yourself. I don't know exactly how to do that, but I fear that you have to send windows messages to the window to create the button and handle the events.

---
single minded; short sighted; long gone;

RussBus25-Jul-07 9:04

25-Jul-07 9:04

I just want the button some where on my form, does not have to be in the title bar. So when you click on my help button I want the same thing to happen if you push the one in the title bar.

Paul Conrad25-Jul-07 9:35

25-Jul-07 9:35

RussBus wrote:
I just want the button some where on my form, does not have to be in the title bar.

Just make your own button with a question mark image then.

RussBus wrote:
I want the same thing to happen if you push the one in the title bar.

Why even bother with that one when you have another help button on your form?

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

RussBus25-Jul-07 9:58

25-Jul-07 9:58

I have a button currently on my form that says help, that is not the problem the problem is getting that button to react the same way as the on in the title bar... thus allowing me to remove the on from the title bar.

Luis Alonso Ramos25-Jul-07 16:58

Luis Alonso Ramos

25-Jul-07 16:58

How does the help button in the title bar react differently?

If you handle the event for those buttons, just execute the same code, and both buttons will react the same. Or am I wrong?

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

My Blog!

RussBus26-Jul-07 3:54

High performance: DataGridView1.DataSource = MyDataTable (100,000 rows) [modified]

26-Jul-07 3:54

The help button in the title bar sets the mouse cursor to a "?" and allows you to click on any control which then brings up a small help window.

I don't know what event to call for that button is the problem.

god4k25-Jul-07 6:21

god4k

25-Jul-07 6:21

Dear, Sir and Madam

How to improve performance for the code below?

DataGridView1.DataSource = MyDataTable; //(MyDataTable contains 100,000 rows)

The code above spent About 8-9 seconds that so long.

Thank You.

NOTE: WinForm not WebForm

-- modified at 12:39 Wednesday 25th July, 2007

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

Dave Kreskowiak25-Jul-07 7:32

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 7:32

You're retrieving 100,000 rows and 8 to 9 seconds isn't fast enough for you?? Hint: Retrieve less rows! If you're not doing anything with ALL of those rows, there's no reason to retrieve them, now is there?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Paul Conrad25-Jul-07 7:48

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 7:48

Dave Kreskowiak wrote:
Hint: Retrieve less rows! If you're not doing anything with ALL of those rows, there's no reason to retrieve them, now is there?

Exactly. I don't understand why people want to fetch that much at once, unless it is some kind of coordinate mapping/computing thingee-bobber.

Dave Kreskowiak wrote:
100,000 rows and 8 to 9 seconds

That's on the order of approximately 10k records/second...

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

god4k25-Jul-07 8:19

god4k

25-Jul-07 8:19

MyDataTable get data(rows) from Xml file not from database.

If I use MyDataTable.DefaultView.RowFilter = "xxx",
it will spent time for this process instead.

8 to 9 seconds is not fast enough for me.

Is there any idea to improve performance?

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

kubben25-Jul-07 8:26

kubben

25-Jul-07 8:26

Break up the xml file to smaller files and load the correct one base off whatever RowFilter you are planning on setting.

Ben

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

Dave Kreskowiak25-Jul-07 8:34

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 8:34

An XML file is a just a Text file. It takes a LONG time for the DataSet class to load AND PARSE that much stuff. 8 to 9 seconds for a file that big is GOOD. You simply have no choice but to break that file down into smaller chunks, organized how you want it filtered, then load only those files that you need.

There is no other way to speed this up...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Paul Conrad25-Jul-07 8:38

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 8:38

Dave Kreskowiak wrote:
8 to 9 seconds for a file that big is GOOD.

No kidding, especially for an XML file. Talk about bitching over spilled milk... If it is such a big deal, then he needs to refactor the problem into a smaller file like kubben recommended.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

god4k25-Jul-07 8:44

god4k

25-Jul-07 8:44

8-9 seconds that I tell you not include Load AND PARSE Xml file.

DateTime d1 = DateTime.Now;
DataGridView1.DataSource = MyDataTable
DateTime d2 = DateTime.Now;
TimeSpan ts = d2 - d1;
Console.WriteLine(ts);

Thank You.

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

Dave Kreskowiak25-Jul-07 9:39

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 9:39

god4k wrote:
8-9 seconds that I tell you not include Load AND PARSE Xml file.

Then why did you say so?!?

god4k wrote:
DateTime d1 = DateTime.Now;
DataGridView1.DataSource = MyDataTable
DateTime d2 = DateTime.Now;
TimeSpan ts = d2 - d1;
Console.WriteLine(ts);

You're not seriously rendering 100,000 rows in a dataGrid, are you?? Is the user even going to look at all of that crap?? You really need to rethink your design, 'cause there is no way to speed up the rendering of 100,000. What does the user need to see?? That is all you should be showing them. I can't think of a single good reason to show a user 100,000 rows of a table...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Paul Conrad25-Jul-07 9:48

Re: High performance: DataGridView1.DataSource = MyDataTable (100,000 rows)

25-Jul-07 9:48

Cut the amount of data down as Dave has said. Only pull up the data that the user is going to be using at the moment, and 100,000 rows is not going to be the case. Allow the user to filter the rows he/she is going to need.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Dave Kreskowiak25-Jul-07 13:46