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How to improve preformance of drawing in c#

Member 33751415-Sep-09 1:33

15-Sep-09 1:33

HI,
In a special case in our project i have to draw around 180,000 rectangles on the window, Its taking almost 2 seconds to do it, and it has zoom and scrolling features too. Is there any way to impove the performance.

Thanks
ravi

Re: How to improve preformance of drawing in c#

Nuri Ismail15-Sep-09 1:47

Nuri Ismail

15-Sep-09 1:47

See Don't Flicker! Double Buffer![^] Smile | :)

Regards
Nuri Ismail

Re: How to improve preformance of drawing in c#

Luc Pattyn15-Sep-09 4:39

Luc Pattyn

15-Sep-09 4:39

double-buffering improves the visual experience, it does not really change the execution speed.

Smile | :)

Luc Pattyn

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Re: How to improve preformance of drawing in c#

Nuri Ismail15-Sep-09 4:59

Nuri Ismail

15-Sep-09 4:59

Thanks, I know that. Smile | :)

The OP was talking about zoom and scrolling features. I decided that double-buffering technique could greatly improve the visual experience when using these features.

Thanks
Nuri Ismail

Re: How to improve preformance of drawing in c#

musefan15-Sep-09 2:09

musefan

15-Sep-09 2:09

That is a lot of rectangles, are you by any chance using them to represent a grid? If so then you could try using lines to draw the grid, this would reduce the number of draws to ~900. If not a grid, then what needs so many rectangles?

Life goes very fast. Tomorrow, today is already yesterday.

Re: How to improve preformance of drawing in c#

Eddy Vluggen15-Sep-09 2:39

Eddy Vluggen

15-Sep-09 2:39

Perhaps you can draw it in a separate thread and pass the resulting picture back to be used as a background for the Window?

I are Troll Smile | :)

redirect to PHP page from C# code

Alaa Telfah15-Sep-09 1:32

Alaa Telfah

15-Sep-09 1:32

Hi for all
im now tring to redirect my project to PHP page from C# APP
and i used these lines (code):
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create("http://localhost/d.php");

// execute the request
HttpWebResponse response = (HttpWebResponse)
request.GetResponse();

that executed my program without showing me a PHP page in my browser

and i used these lines also as my code

string targetURL = @"http://localhost/MyPage.php";
System.Diagnostics.Process.Start(targetURL);

and that run true but i prefer the first method to do that
So any help

Thanks in advance

Re: redirect to PHP page from C# code

SeMartens15-Sep-09 1:37

SeMartens

15-Sep-09 1:37

Hi,

the first method will not open a browser, because you are doing a http-request. This means you call the site like a browser. The second call opens the browser because the operating system will open the browser to handle the command (in this case an url) you passed.

For displaying the php-page within your app you could use the webbrowser-control.

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Convert The Layout Of The Application Between Arabic And English

Thaer Hamael15-Sep-09 1:20

Thaer Hamael

15-Sep-09 1:20

Hi All

I'm create a system of medium-sized
I want to be the system of bilingual Arabic and English
I want to do the work Mithod GENERAL Oqo Bmnadadtha screen present in the system
How Ostzia of change in the screen from right to left or vice versa
Has been used following code but all the screen using this code to close immediately after opening

if (Arbic)
{
Form.RightToLeft = RightToLeft.Yes;
Form.RightToLeftLayout = true;
}
else
{
Form.RightToLeft = RightToLeft.No;
Form.RightToLeftLayout = false;
}

thanks Rose | [Rose]

Thaer

Re: Convert The Layout Of The Application Between Arabic And English

Keith Barrow15-Sep-09 1:34

Keith Barrow

15-Sep-09 1:34

You should look at using Internationalization. This will greatly cut down the work you need to do.
This link[^] has a section on Arabic support. here[^]

Isolation Levels

scotlandc15-Sep-09 0:53

scotlandc

15-Sep-09 0:53

Hi,

Am trying to update a database, setting a datetime value to the value set on a datetimepicker, and every time I try it, I get the following error message

ERROR[HY000][DataDirect][ODBC Progress OpenEdge Wire Protocol driver][OPENEDGE]Statement not allowed in readonly isolation level (7671)

Is it possible to override this isolation level, and if so, please can someone point me in the right direction of how?

With thanks in advance

Scott

Thumbnail of minimized Form

Paw Jershauge15-Sep-09 0:39

Paw Jershauge

15-Sep-09 0:39

Does anyone know how to get an thumbnail of an Form thats Minimized Confused | :confused:

This code works ok when the form is normal or maximum size, but not when its minimized, or anything in front of it.

private Bitmap GetFormImage(Form formToCapture)
{
    Bitmap formImage = null;
    using (Graphics g = formToCapture.CreateGraphics())
    {
        formImage = new Bitmap(formToCapture.Size.Width, formToCapture.Size.Height, g);
        using (Graphics mg = Graphics.FromImage(formImage))
        {
            IntPtr dc1 = g.GetHdc();
            IntPtr dc2 = mg.GetHdc();
            BitBlt(dc2, 0, 0, formToCapture.ClientRectangle.Width, formToCapture.ClientRectangle.Height, dc1, 0, 0, 13369376);
            g.ReleaseHdc(dc1);
            mg.ReleaseHdc(dc2);
        }
    }
    return formImage;
}

Appreciate the help... Thumbs Up | :thumbsup:

With great code, comes great complexity, so keep it simple stupid... $Shucks | :-\$ $Shucks | :-\$

Re: Thumbnail of minimized Form

musefan15-Sep-09 1:21

musefan

15-Sep-09 1:21

You could try showing the form, get the image, and then minimize it again

Life goes very fast. Tomorrow, today is already yesterday.

Re: Thumbnail of minimized Form

Paw Jershauge15-Sep-09 2:01

Paw Jershauge

15-Sep-09 2:01

This is not posible... but a good alternative... thanks for the reply...

With great code, comes great complexity, so keep it simple stupid... $Shucks | :-\$ $Shucks | :-\$

Re: Thumbnail of minimized Form

Henry Minute15-Sep-09 1:38

Henry Minute

15-Sep-09 1:38

The Form class, like all Control descendants has a ToBitmap method, I don't know if you might be able to make use of that.

I hesitate to expand on my answer, since to me a Minimized Form has no graphical representation to put in an image. When minimized a Form is only shown in the TaskBar, and then only if the appropriate properties are set.

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: Thumbnail of minimized Form

Paw Jershauge15-Sep-09 2:03

Paw Jershauge

15-Sep-09 2:03

You are absolutly correct on this, the form has not graphical representation, but how does M$ do it, when you look at vista or win7 thay can make an thumbnail of an window thats minimized... Thanks for the reply...

With great code, comes great complexity, so keep it simple stupid... $Shucks | :-\$ $Shucks | :-\$

Re: Thumbnail of minimized Form

Henry Minute15-Sep-09 2:11

Henry Minute

15-Sep-09 2:11

Paw Jershauge wrote:
but how does M$ do it, when you look at vista or win7 thay can make an thumbnail of an window thats minimized

If I knew that, I'd probably be working for them. Smile | :)

Unfortunately I don't. Frown | :(

However, I have just found this[^], which refers to a SetIconicThumbnail method, which sounds, sort of, like it might be what you need.

Good Luck! Smile | :)

Re: Thumbnail of minimized Form

Paw Jershauge15-Sep-09 6:25

Paw Jershauge

15-Sep-09 6:25

Hey Henry

Thanks for the reply, i did find that one aswell, unfortunately it only works under Windows 7, which does not work for me... but ones again, thanks for the effort... Wink | ;)

With great code, comes great complexity, so keep it simple stupid... $Shucks | :-\$ $Shucks | :-\$

how to clear the value of the ASP.NET FileUpload control in Web application.

coolsharath15-Sep-09 0:00

coolsharath

15-Sep-09 0:00

Hi,

I need to clear all the Control field's - (Radiobuttonlist, Dropdownlist, Textboxes and Fileupload) values on a button click. I am able to do for Radiobuttonlist, Dropdownlist and Textboxes but not able to do for FileUpload control. Can anyone please help me out in this. Thanks in advance

Thanks,
Santa.

Re: how to clear the value of the ASP.NET FileUpload control in Web application.

Keith Barrow15-Sep-09 0:05

Keith Barrow

15-Sep-09 0:05

You should:

1. Post this in the ASP.NET forum.
2. Post some code to show what you have tried.

Customer Grid View

Syed Shahid Hussain14-Sep-09 23:59

Syed Shahid Hussain

14-Sep-09 23:59

Hi,

I want to show serial numbers on the row headers and check boxes in the first columns of the grid. Please give me an idea or reffer me to some good article.

Thanks

Syed Shahid Hussain

Re: Customer Grid View

Henry Minute15-Sep-09 1:48

Henry Minute

15-Sep-09 1:48

Firstly, what sort of grid?
1) A Windows Forms DataGrid?
2) A Windows Forms DataGridView.
3) A Web Forms DataGrid.

If either of the first two, and they are the only two items of data that you want in your DataGrid, it seems to me that you might be better using a data bound CheckedListBox.

Re: Customer Grid View

Syed Shahid Hussain15-Sep-09 2:56

Syed Shahid Hussain

15-Sep-09 2:56

Thanks Henry,

But I want to make a user control in which I can allow the user to see row numbering and the selection check box. numbering is not so important but check box is keen requirement. And I want to give the check box option in the properties window so that in some cases if we dont want to show check box it will not generated. Iæve in mind that there is onpaint method where I've to write code but how I just want a move.

(This GV will be used very frequently in my appplication so that plz reply soon I wnat to develop it as soon as possible)

Thanks

Syed Shahid Hussain

Re: Customer Grid View

Henry Minute15-Sep-09 3:05

Henry Minute

15-Sep-09 3:05

I suggest the following search terms for Bingle

1) c# add checkbox column to datagridview
2) c# datagridview row header text

Loads of hits for both. Just pick the ones that fit your scenario best.

hide the text in specified position?

raj23136214-Sep-09 23:26

raj231362

14-Sep-09 23:26

hi..all,

We are going to make PDF file from image tiff. Also we have co-ordinate information of the text. Now we want to hide the text in specified position. Is this dll has facility to hide the text in specified position?

Please Help me..

any example would be appreciated..

Thanks,
Raj

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