DataGridView updating datasource problem - C# Discussion Boards

Re: how to solve C# graphicsPath.widen outofmemoryException

DaveyM695-Apr-09 23:08

DaveyM69

5-Apr-09 23:08

This will happen when StartPoint == EndPoint.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: how to solve C# graphicsPath.widen outofmemoryException

wgh168996-Apr-09 4:01

wgh16899

6-Apr-09 4:01

thank your answer ,but incorrectness.

Pen p = new Pen(Color.Black,PenWidth);

GraphicsPath gp=new GraphicsPath();

Point StartPoint=new Point(234,123);
point EndPoint=new Point(567,345);

gp.AddLine(StartPoint,EndPoint);

gp.Widen(p);//error:outofmemoryException

This will also happen when StartPoint != EndPoint .

Re: how to solve C# graphicsPath.widen outofmemoryException

DaveyM697-Apr-09 1:13

DaveyM69

7-Apr-09 1:13

That code works for me with no exception. The only way I can generate an exception is if the points are equal.

Is this the actual code you are using? If not, the problem could be elsewhere in your code and not manifesting itself until the Widen call.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: how to solve C# graphicsPath.widen outofmemoryException

wgh168997-Apr-09 2:19

wgh16899

7-Apr-09 2:19

thanks for your answer ,you are right.

Static KeyWord

Isaac Gordon5-Apr-09 21:48

Isaac Gordon

5-Apr-09 21:48

Hi Experts
Please Help Me About The Static Keyword in C#.NET
But is Diff. Between Int i;Static Int i;
and Why And When We Make Static Class ,Methods or Variable Declare Static in C#.NET
....................
Pls Pls.................

Dinesh Sharma

Re: Static KeyWord

Megidolaon5-Apr-09 21:57

Megidolaon

5-Apr-09 21:57

Static says that something is not bound to objects.

Class members are usualy members of the instances, not of the class itself.
Static changes this and the attributes of methods are part of the class itself, you can't access from instantiated objects, because they don't have it.

The advantage instance members are as many times in the memory as you have instantiated objects, while static members are only once in the memory, no matter how many instances you have (even 0).

Also, as static members are independant from instances, you can use them to provide things to work with for all objects instantiated from a class.
If it is was an instance member, the value would differ for each instance, in case of methods they usually don't have acess to other instances.

Static members are called by using the point (.) operator directly from the class name.
For example int.Tryparse() is a static method that does not get called from an instance (an int variable or radical), but the class itself.

Re: Static KeyWord

N a v a n e e t h5-Apr-09 22:04

N a v a n e e t h

5-Apr-09 22:04

Adding to the first reply, Static variables got more lifetime. It stays in the memory until the application domain where it is hosted ends.

Sharma Dinesh Kumar wrote:
And When We Make Static Class ,Methods or Variable Declare Static in C#.NET

There are many situations where static classes or methods are appropriate. One example is, Singleton[^] design pattern implementation.

Navaneeth

How to use google | Ask smart questions

DataGridView updating datasource problem

half-life5-Apr-09 21:24

half-life

5-Apr-09 21:24

hi,

the layout:
1. datagridview with a datasource (access db)
2. new button column "Update" to ...

the problem:
whenever i click on the Update Button, without pressing Enter when i've finished editing no updtae occures (to the db file)

in other words Smile | :)

only when i press the Enter after i've finished editing a cell and then press the "Update" button the update occures (to the db file)

the Q???
what the hell????, Sorry sorry
what is hapening,
i've added the valuechanged event (on the data grid view) and the value did change before i click the Update Button, is there any push value to...
help Sigh | :sigh:

Have Fun
Never forget it

Re: DataGridView updating datasource problem

Greg Chelstowski5-Apr-09 22:07

Greg Chelstowski

5-Apr-09 22:07

The CellValueChanged event triggers, I believe, after the cell you've been editing comes out of editmode.
I would say, on the buttonclick of your updatebutton use your CurrentCell's EditedFormattedValue in your db updating method.
Hope this makes sense...

var question = (_2b || !(_2b));

Re: DataGridView updating datasource problem

half-life5-Apr-09 22:25

half-life

5-Apr-09 22:25

first of all thanks for replying Smile | :)

CurrentCell's EditedFormattedValue is not helping because i'm updating using the
tableAdaptor.Update(Row) method Smile | :)

and the thing is that Pressing the Enter button or not does;nt change the fact that the value has changed Smile | :)

but still - if i'll not press the Enter button the updating will not occur Smile | :)

thanks

Have Fun
Never forget it

Re: DataGridView updating datasource problem

Henry Minute6-Apr-09 1:57

Henry Minute

6-Apr-09 1:57

half-life wrote:
and the thing is that Pressing the Enter button or not does;nt change the fact that the value has changed

It has changed on the screen, but has it changed in the bindinglist?

But why should anyone answer your question? You obviously know all the answers already!

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: DataGridView updating datasource problem

half-life6-Apr-09 2:03

half-life

6-Apr-09 2:03

now i know u're meaning in life is to pursue not happiness but People insted Smile | :)

nice

go for it,
and to your Q

yes it has changed in the bindinglist Smile | :)

i've fixed that too

oow, again thanks for your help Smile | :)

but please don't help me in the future

Have Fun
Never forget it

Re: DataGridView updating datasource problem

Henry Minute6-Apr-09 2:08

Henry Minute

6-Apr-09 2:08

Oh really, it's no problem!

Sizing issue with rotate Graphic

FrankeyJames5-Apr-09 20:22

FrankeyJames

5-Apr-09 20:22

Okay, I thought this should be for a new thread....

I have an existing image.

originalImage = new Bitmap(path.ToString());

Bitmap newImage = new Bitmap(originalImage.Width, originalImage.Height);
g = Graphics.FromImage(newImage);

Matrix matrix = new Matrix();
matrix.Rotate(10f);

g.TranslateTransform( ((float)originalImage.Width) / 2,  ((float)originalImage.Height) / 2);
g.RotateTransform(10f);
g.TranslateTransform(-((float)originalImage.Width) / 2, -((float)originalImage.Height) / 2);


g.DrawImage(originalImage, 0, 0);

This works just as I want it to in terms of rotating on an axis in the center of a picture instead of 0,0 (x,y)coords. However, say my original picture is (wXh) 473x640 and when resized 10f I know it's supposed to be 577x712 or so. The reason it's bigger is that when the picture is rotated, say, angle of 10, the top left corner is no longer within the original dimension of the image and therefore apear cut off. I do not want this. I want the image to resize as needed to fit the entire contents of a rotated image.

Any idears? Setting the g.DrawImage and setting the width height, even to the known values needed, just exands the image is the Graphics object, so it appears, already lopped off parts of my image to stay within the initial constraints. I don't know how to mkae the Graphic larger bigger without affecting the Bitmap it initially used....

If there are any good sources for .net graphics that'd be great. I can't find an examples in dr. google and my pro c# book doens't have any such examples.

Re: Sizing issue with rotate Graphic

Christian Graus5-Apr-09 20:29

Christian Graus

5-Apr-09 20:29

You're on the right step with your translate code, so that you rotate around the centre. I'm not sure how to calculate the required size of the new image, but obviously you need to know it when you create newImage, so you can create an image of the right size. I would imagine you could work out some triangles that are formed by the outline of the old image and the new one, and use trig to work out the length of the new sides, and thus work out the size of your new image.

Christian Graus

Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

Re: Sizing issue with rotate Graphic

FrankeyJames5-Apr-09 20:57

FrankeyJames

5-Apr-09 20:57

Hello,

Well, instead of doing the hard work I used another program to rotate 10 degrees and it resized appropritately (at least visually). From this I gathered the new dimensions of what the resized picture should be.

Still, armed with this it does now good to set the size of the new image using g.drawImage() because the image within graphics object is already chopped up. So all setting the new image with the larger widthXheight known values does is create a bigger 'chopped up' pic. ;-]

It's strange, I thought perhaps setting the variable newImage = bitmap() with the known values, but that just make the initial picture bigger and therefore the result (g.drawimage()) equally bigger (compared to original image dimension), but still it's chopped up.

What the problem is, i think, is that the Graphics object somehow needs to be enlarrged before I call the rotate function... well, that's sort of what I've narrowed it down to. It's funny, moments ago I even found a really good exmpale of roating a Graphics...but, still, they didn't account for the resizing issue.

Re: Sizing issue with rotate Graphic

Christian Graus5-Apr-09 21:07

Christian Graus

5-Apr-09 21:07

FrankeyJames wrote:
is that the Graphics object somehow needs to be enlarrged before I call the rotate function...

Yeah, if you rotate the original image, which is too small, then it's obviously going to get chopped ont he side. As I said, you can't resize a grpahics object.

Re: Sizing issue with rotate Graphic

FrankeyJames5-Apr-09 21:19

FrankeyJames

5-Apr-09 21:19

Yeah...

I think I got it now. I think I figured out what is wrong. Now I just need to do this math calculation so it's automated....

If and when I get a godo solutiong working I'll post it here.

Re: Sizing issue with rotate Graphic

Luc Pattyn6-Apr-09 3:14

Luc Pattyn

6-Apr-09 3:14

Hi again,

As you figured out, it is easiest to translate things such that the origin is at the center.

These are the equations that rotate a point (x1,y1) around the origin over an angle alpha, whose cosine and sine are cosa and sina:

x2 =  x1 * cosa + y1 * sina
y2 = -x1 * sina + y1 * cosa

If you apply that to the rightmost top and bottom points (W1/2,H1/2) and (W1/2, -H1/2) where W1 and H1 are original width and height, you get two new points one of which will have the extreme X value (hence half of the new width) the other the extreme Y value (half of the new height).

Smile | :)

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- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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How to Execute C# / SQL statement in outlook

dabuskol5-Apr-09 20:14

dabuskol

5-Apr-09 20:14

Hi,

I have a system web page (c#) that is running within the company there is one process in the system that needs approval from vendor/supplier within the company (separate office). The request is that thay just want to receive email notification for approval using MS outlook and then there are 2 buttons (approved/reject) either of the two should execute the SQL statement that will update the flag of the record table.

Any suggestions on how to do it?

My solution:
I created a web page where all the updates for approve/reject was there. I can send outlook message to the users with 2 buttons. Once he click either of the two it will run the web page and should execute the SQL statement. Unfortunately, nothing happen. At the same time the web page should close automatically.

Regards

Dabsukol

Re: How to Execute C# / SQL statement in outlook

Christian Graus5-Apr-09 20:21

Christian Graus

5-Apr-09 20:21

Your client is making stuff up. Real developers step in and tell people why they can't have anything they like.

In this world, Outlook limits what it will display/allow because of all the viruses out there. I would not be surprised if what they want, won't work.

How to make FTP

E_Gold5-Apr-09 19:56

E_Gold

5-Apr-09 19:56

Hi
how can i build FTP client for copy files from the server to other computers
and terminal ?

thank's in advance

Re: How to make FTP

Rajdeep.NET is BACK5-Apr-09 20:03

Rajdeep.NET is BACK

5-Apr-09 20:03

This is not the place for asking anything related to basic networking or whatever. We only solve programming problems, that too only if the code is provided for rectification. Got it? Big Grin | :-D

Re: How to make FTP

stancrm5-Apr-09 21:03

stancrm

5-Apr-09 21:03

Simple FTP demo application using C#.Net 2.0[^]

How to preserve file attributes

sumit70345-Apr-09 19:51

sumit7034

5-Apr-09 19:51

Hi I am copying file using SafeFileHandle but if source folder contains any hidden file it also get copy but in destination it is not a hidden file. I want that after copy the attributes remain the same.

Please Help

Thanks in Advance.
Rose | [Rose]

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