C# Discussion Boards - CodeProject

ThetaClear30-Jan-07 6:16

30-Jan-07 6:16

Hello everybody

I have layouts pictures of a TrackBar.
I wanted to know how can I set the pictures to the TrackBar control.
What I mean is I have a picture of the slider (the thing that I move in the trackbar) and I have the pictures for the actual trackbar that changes according to the place that I move the slider bar.
How can I do it?

thanks for your help

Re: TrackBar

Christian Graus30-Jan-07 9:17

Christian Graus

30-Jan-07 9:17

Make the control owner drawn. Or, you may need to write your own control.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Re: TrackBar

ThetaClear30-Jan-07 9:42

ThetaClear

30-Jan-07 9:42

That's the first time I'm doing this kind of thing so I didn't quite understood your answer.
Can you elaborate, please.

thanks for the help

Re: TrackBar

Christian Graus30-Jan-07 10:41

Christian Graus

30-Jan-07 10:41

You can set a control to be OwnerDrawn, which means you handle an event and draw it yourself. You can then draw whatever bitmap you like. I'm not sure how this will work for a trackbar, but I know of no other way to create a trackbar that has a custom look, unless you wrote the class yourself.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Re: TrackBar

Luc Pattyn30-Jan-07 12:28

Luc Pattyn

30-Jan-07 12:28

There are a couple of articles on trackbar

You might have a look at this one[^]

Smile | :)

Luc Pattyn

Re: TrackBar

ThetaClear31-Jan-07 2:52

ThetaClear

31-Jan-07 2:52

thanks for your answers! Smile | :)

UserControl within a UserControl

goldoche30-Jan-07 5:05

goldoche

30-Jan-07 5:05

Hi, I have a very frustrating problem. I have this UserControl I use on a Form. This UserControls is nothing complicated: buttons, textboxes, etc. When I start my application, everything works fine.

When I add another (simple) UserControl to my first UserControl, everything works fine too... well almost everything. The application starts and works 100%, but when I close it and go back to the Designer of my main application, Visual Studio says that:

"An exception occurred while trying to create an instance of MyProject.MyUserControl. The exception was "Object type cannot be converted to target type."."

I seems that the Designer creates an instance of every control on the Form and this particular UserControls cannot be created properly.

I really need some help, this is going to drive me nuts! I've spent more than two days on this problem!

Re: UserControl within a UserControl

Martin#30-Jan-07 5:26

Martin#

30-Jan-07 5:26

Hello,

I also had a lot of bad days because of that.

1)
What you can try is, copy the dll or exe (where your second usercontrol is in) to a temp file and then ad the control in he designer over that dll.
I think the problem is some kind of circular dependences between the usercontrols.
In worst case you could try to export the second control in a seperat project(dll) and try it again.

2)
An other posibility is that your second usercontrol throws an exeption.
Therefore you could start a second instance of your design application (VS or something) and connect to the first.
Then you have to change the settings, that you jump in the debugger if an exception occurs.

Hope it helps.

All the best,

Martin

Re: UserControl within a UserControl

Luc Pattyn30-Jan-07 5:36

Luc Pattyn

30-Jan-07 5:36

Maybe this article[^]
contains what you need, or at least provides a hint.

Smile | :)

Luc Pattyn

Save treeview expanded state

studiomaxer30-Jan-07 4:18

studiomaxer

30-Jan-07 4:18

I'm working on an application where i need to reload nodes based on database info. I need to save the expanded state so that the user doesn't have to navigate back to where he was after the reload. I can't for the life of me get this working.

Anyone know how to do this?

Re: Save treeview expanded state

Mircea Puiu30-Jan-07 4:50

Mircea Puiu

30-Jan-07 4:50

I think ... it was already asked and answered before (even 2 solutions were offered).
I was proposing something like this:

ArrayList history;
....
history = new ArrayList(); // in Form1_Load()
....
// In reeView1_AfterSelect()
TreeNode tn = this.treeView1.SelectedNode;
if (tn != null) this.history.Add(tn);
....
// In YourBackButton_Click()
if (this.history.Count < 2) return;
// Unregister the AfterEselect event
this.treeView1.AfterSelect -= new System.Windows.Forms.TreeViewEventHandler (this.treeView1_AfterSelect);
// Get the previously selected node
TreeNode tn = (TreeNode)this.history[this.history.Count - 2];
// Remove the last selected node from the history
this.history.RemoveAt(this.history.Count - 1);
// Select the node and expand it
this.treeView1.SelectedNode = tn;
while (tn != null)
{
	tn.Expand();
	tn = tn.Parent;
}
// Re-register the AfterSelect event
this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
// Set the focus to the TreeView
this.treeView1.Focus();

Some other guy has proposed the use of Stack instead of my ArrayList (even better).

SkyWalker

Re: Save treeview expanded state

bobsugar22230-Jan-07 10:17

bobsugar222

30-Jan-07 10:17

Hehe! That was me Smile | :)

It was to implement history for a "Back" button on a treeview. But you could use it here. Here it is. Or the principle anyway. If you just want to remember the last selected node you wouldn't need a whole Stack or ArrayList though. Just an internal reference to the node.

Cancel Search Operation

Monika Dotnet Newbie30-Jan-07 4:01

Monika Dotnet Newbie

30-Jan-07 4:01

Hi,

I am trying to cancel the Serach operation once it gets started, Search is any kind of text search against database, i am using hibernate for database connectivity, Could anyone give me a direction to start.

Thanks in advance
Monika

Re: Cancel Search Operation

Mircea Puiu30-Jan-07 4:19

Mircea Puiu

30-Jan-07 4:19

You coud use a BackgroundWorker, with WorkerSupportsCancelation set to true

SkyWalker

Set Webservice wsdl Programmticaly

Tyler4530-Jan-07 3:44

Tyler45

30-Jan-07 3:44

Hello friends,
I use some web services in my project. But I want to change some this one web services ip.
For ex.
i use http://192.168.0.1/ex.wsdl some times i want to use
http://192.168.0.5/ex.wsdl.
both of them are same functions.
Is there any idea?
Thanks
Best Regards

Re: Set Webservice wsdl Programmticaly

jchigg200030-Jan-07 4:10

jchigg2000

30-Jan-07 4:10

Under what conditions do you want to use the other IP Address?

Re: Set Webservice wsdl Programmticaly

Tyler4530-Jan-07 4:44

Tyler45

30-Jan-07 4:44

there is no condition. wsdls will be fill on combobox when user select any of web service will be run on this url.
i found something that:
if i create a web service object and then there is a url property, and it is possible to set it. now i am trying to use it,

It's urgent

sjs4u30-Jan-07 3:24

sjs4u

30-Jan-07 3:24

How to set evaluation period for the perticular software or any project develop in C#.Net.

that is after 30 days the project will not work. It will asked for patch or key

Re: It's urgent

Martin#30-Jan-07 3:32

Martin#

30-Jan-07 3:32

It looks like you haven't looked at the advice Christian Graus gave you last time.
1 - please use meaningful titles

Maybe you have time to take a look:
http://www.codeproject.com/script/comments/forums.asp?msg=1278604&forumid=1649#xx1278604xx[^]

Re: It's urgent

Colin Angus Mackay30-Jan-07 3:47

Colin Angus Mackay

30-Jan-07 3:47

sjs4u wrote:
How to set evaluation period for the perticular software or any project develop in C#.Net.

that is after 30 days the project will not work. It will asked for patch or key

sjs4u wrote:
It's urgent

Isn't this something that you should have thought of at the start of the project?

A piece of advice. When you start a project you identify as many of the risks that may make it take longer than expected, or things that you don't know about. Now, I've never managed to identify ALL of them at the start, but I managed enough of them so that nothing comes as a complete surprise.

This is obviously something that you don't know how to do. Also, the fact that you are asking urgently suggests the project is almost over. Some things need to be designed in at the start and cannot just be dropped in - that is why we plan for them.

Now, in answer to your question. There are many people much more clever than I that have worked on this question for years. You can find their work at places such as Aladdin[^]

Upcoming events:
* Glasgow Geek Dinner (5th March)
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Re: It's urgent

Pete O'Hanlon30-Jan-07 3:50

Pete O'Hanlon

30-Jan-07 3:50

Good reply.

Colin Angus Mackay wrote:
There are many people much more clever than I that have worked on this question for years

Don't sell yourself short. It's not that they are necessarily cleverer, it's just that this is their field of expertise.

the last thing I want to see is some pasty-faced geek with skin so pale that it's almost translucent trying to bump parts with a partner - John Simmons / outlaw programmer

Deja View - the feeling that you've seen this post before.

Re: It's urgent

ed^nrgc30-Jan-07 5:21

ed^nrgc

30-Jan-07 5:21

Then BUY IT!!!! Mad | :mad: