C# Discussion Boards - CodeProject

23-Jun-08 2:57

then ehy not build a DataTable with your result set and then bind it to the DataGridView?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

Re: DataGridView copy

V.23-Jun-08 3:02

23-Jun-08 3:02

more or less the road I'm heading to right now. thanks. Wink | ;)

V.

Stop smoking so you can: Enjoy longer the money you save.
Moviereview Archive

Re: DataGridView copy

Harvey Saayman23-Jun-08 3:05

Validation List<t> object</t>

23-Jun-08 3:05

any time

good luck!

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

RichardContact-123-Jun-08 2:08

RichardContact-1

23-Jun-08 2:08

Anyone know how I can validate the Add method of a List<> property I have on a class short of overriding the Add method with a custom class?

e.g.

private List<string> stringList
public List<string> StringList
{
get
{
return stringList;
}
set
{
// Want to do validation here but isn't fired by Add method....
}
}

Thanks for any help on offer....

Re: Validation List object

N a v a n e e t h23-Jun-08 2:16

N a v a n e e t h

23-Jun-08 2:16

You need to create your class which wraps List<<>. Write your own "Add" method, do validation there before you add to underlying list.

RichardContact-1 wrote:
set
{
// Want to do validation here but isn't fired by Add method....
}

This won't fire. When you call YourObject.StringList.Add(), get is executing, not set. get returns List<> instance and you add item to that. If you were doing YourObject.StringList = new List<string>, set will get executed.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

How to use google | Ask smart questions

Re: Validation List object

Giorgi Dalakishvili23-Jun-08 2:24

Giorgi Dalakishvili

23-Jun-08 2:24

Have a look at this: Why do collections not know they have been changed?[^]

Giorgi Dalakishvili

#region signature
my articles
#endregion

double buffer question

Harvey Saayman23-Jun-08 2:05

23-Jun-08 2:05

hey guys

how do i enable double buffering on a specific panel?

where exactly do i put this?

SetStyle(ControlStyles.AllPaintingInWmPaint |
            ControlStyles.UserPaint |
            ControlStyles.DoubleBuffer |
            ControlStyles.ResizeRedraw,
            true);

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

Christian Graus23-Jun-08 2:25

Christian Graus

23-Jun-08 2:25

myPanel.SetStyle(....

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Harvey Saayman23-Jun-08 2:33

23-Jun-08 2:33

i tried that before posting... its not showing up in intellisence... is there some assembly i should be referencing(using blah.blahblah;)?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

Ed.Poore23-Jun-08 3:28

Ed.Poore

23-Jun-08 3:28

It's a protected method so usually it doesn't appear in Intellisense. If you're authoring a custom control then you typically put the code into the constructor:

public MyControl()
{
  base.SetStyle(/* ... */);
}

I doubt it. If it isn't intuitive then we need to fix it. - Chris Maunder

Harvey Saayman23-Jun-08 4:18

23-Jun-08 4:18

Ed.Poore wrote:
If you're authoring a custom control

indeed i am

i tried that but it didnt work... here is my constructor...

public BreakClockControl()
{
    InitializeComponent();

    base.SetStyle(ControlStyles.AllPaintingInWmPaint |
             ControlStyles.UserPaint |
             ControlStyles.DoubleBuffer |
             ControlStyles.ResizeRedraw,
             true);
    base.UpdateStyles();
}

note: im painting on a panel thats on the control, not the control itself, might that be the problem?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

Ed.Poore23-Jun-08 4:22

Ed.Poore

23-Jun-08 4:22

Yes, in all likely hood. You'd have to enable it on the panel as well. You should be able to call it without having the intellisense - try it and see if it compiles.

I doubt it. If it isn't intuitive then we need to fix it. - Chris Maunder

Harvey Saayman23-Jun-08 4:37

23-Jun-08 4:37

i got it to work like so

public class doubleBufferPanel : Panel
{
    public doubleBufferPanel()
    {
        this.SetStyle(ControlStyles.AllPaintingInWmPaint |
                     ControlStyles.UserPaint |
                     ControlStyles.DoubleBuffer |
                     ControlStyles.ResizeRedraw,
                     true);
            this.UpdateStyles();
    }
}

then i replaced the panel with the doubleBufferPanel, renamed it to same name as the panel i used, hooked up the event handlers ect...

it wasnt flickering anymore but my drawings got all messed up... is that the only way to do it?

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

Ed.Poore23-Jun-08 6:03

Ed.Poore

23-Jun-08 6:03

Isn't there a property to set the double-buffering. This no need for a custom panel?

By messed up how do you mean, that line shouldn't change anything unless your drawing code is badly written.

Harvey Saayman23-Jun-08 9:11

23-Jun-08 9:11

i got it working the previous way... all i did was do it over and it worked

Ed.Poore wrote:
By messed up how do you mean

i use the panel.ClientArea as my square that i draw in, the same thing for every drawing method... yet half the pic was centered as it should be and the other half was way over to the left. maybe just a bug of some kind...

Ed.Poore wrote:
drawing code is badly written

it probably is hey, im new to GDI and stil getting used to it...

thanx for all your help bud!

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

exception

cst_kvp23-Jun-08 1:38

cst_kvp

23-Jun-08 1:38

Explain NullReferenceException? How to resolve it?

leppie23-Jun-08 1:45

leppie

23-Jun-08 1:45

It's when you try to something with an object, but the object hasnt been created.

Look at MSDN for tons of examples.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

Christian Graus23-Jun-08 2:01

Christian Graus

23-Jun-08 2:01

Fix your code. If you don't know how, post it so we can explain it to you.

N a v a n e e t h23-Jun-08 2:03

N a v a n e e t h

23-Jun-08 2:03

It occurs when you are accessing an object with NULL value. Make sure you instantiated object using new keyword.

cst_kvp wrote:
Explain NullReferenceException

OT : why don't you be polite when asking questions ? Read this[^]

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

How to use google | Ask smart questions

Nagy Vilmos23-Jun-08 2:16

Nagy Vilmos

23-Jun-08 2:16

N a v a n e e t h wrote:
why don't you be polite when asking questions ?

You're wasting your time. All his questions are

Subject: Life
Explain life?

The concept of actually showing what is being attempted to provide context is alien to him.

Panic, Chaos, Destruction.
My work here is done.