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Are you describing a scenario where, with the MdiParentForm:
1. one or more MdiChildForms are open and visible (not "collapsed"):
... and ...
2. you then create a new MdiChildForm and 'Show it: naturally it then has "focus," and is front of all other Child Forms:
... and ...
3. then you click inside the "client area" of a visible part of one of the other MdiChildForms that were already open:
... and ...
4. that already-open MdiChildForm you clicked in the client area of: does not: then: have "focus," and is not, now, in front of all the other Child Forms ?
If that is what you are describing: then, there's something very wrong with your code: because: the standard default behavior for clicking on any open (not collapsed) MdiChidForm, in its client area, or on its TitleBar, is: to give it "focus," and bring it in front of all other child forms that are visible.
The logical question to ask, I think, is: when you create a new instance of what will be an MdiChildForm: are you immediately setting its 'MdiParent property to your MdiParent Form ?
And now, excuse me while I get on my "soapbox" and tell you why I think you should not be using Mdi architecture in the first place:
1. it's outmoded, deprecated by MS, and allows the end-user to make visually confusing UI's.
2. even if both MdiParentForm, and MdiChildForm have their 'DoubleBuffered property set to 'true: when you drag a child form around by its TitleBar: you get just an outline of the Child Form.
3. you set the BackGroundColor of your MDIParentForm to some color: that setting is ignored, and you get a dark grey background. You gotta hack around to set its BackColor.
4. It's possible to drag your Child Forms so they are only partially in view inside the MdiParentForm.
So, what's better ? I suggest you consider: independently shown secondary Forms, or you use UserControls, or Panels, that you make movable by the end-user if that's required.
good luck, Bill
"Everything we call real is made of things that cannot be regarded as real." Niels Bohr
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There is a program needed to display 32 road stream on its form, but I found that the display time delay is too hard. Is there anyone meet the similar problem?
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With such a poor desciption of what you app is doing and a non-existant snippet of your rendering code, it's impossible for anyone to answer this question.
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What is 32 road stream? Without this basic information, I'm afraid that I can't even begin to formulate an appropriate answer.
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Sorry, my English is not enough good. The "32 road stream" means using 32 Panel Controls to display video. 8 x 4 layout. In the Main Form, there are 8 Panel Controls in every row and there are 4 Panel Controls in every column. Now I need these 32 Panels to display different video at the same time. At present, I haven't had good idea about how to optimize the these video display.
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Playing video is a resource intensive operation (it takes up a lot of processor/video time). The processing time is going to depend partly on the quality and size of the video streams. Are you scaling the images down to fit in the panels? What control are you using to display the video?
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Hi Pete,
I defined a myself-define control, myVideoWindow, derived from Panel to display Video. When myVideoWindow received the frame data, it will save the frame data as a Bitmap object then use Invalidate() to notificate the Form the refresh the control. In control myVideoWindow's OnPaint() function, I use the g.DrawImage() to draw last frame data.
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Hi All,
I am using google translator to translate my code from different languages to english but if i want to translate multiple(and with different data) files it is taking so much of time so that i want to use threads to translate those multiple files at a time and i am having data in ms access tables(multiple) i need to translate that data too
please provide me the c# code for using threading for converting multiple database tables and files
Thank you so much
Regards,
Sri
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Have a look at something called the Task Parallel Library. If you search here on Code Project, you will find some excellent articles on it (pay particular attention to those by Sacha Barber).
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Sridk wrote: please provide me the c# code
You look lost; the forum is for software developers, aimed at helping when one is stuck.
If you need someone to "provide you with codes", hire someone to write 'em.
Bastard Programmer from Hell 
if you can't read my code, try converting it here[^]
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Sridk wrote: please provide me the c# code
Asking for code is considered rude here and may invite a rain of downvotes. Instead, ask for ideas.
There are many ways to execute multiple tasks in parallel including:
1. Create as many instances of the Thread class and execute them in parallel.
2. Use the ThreadPool class
3. Use BackgroundWorker class
4. Use Task Parallel Library
A word of caution: Using threads may not necessarily improve the performance of your code unless you have multiple processors or your processor has multiple cores. So if you have a single processor with a single core, it will not make any difference in the time taken to complete the task. On the contrary, it may actually slow down your task due to the threading overhead.
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Okay so here's the deal. I have an event that generates a number of xaml components on the fly. One of these xaml components also has some events hooked up to it. In order to do this I am using the following line of code
Holder.ManipulationDelta += new ManipulationDeltaEventHandler(HolderManipulationDelta);
This is then handled with
private void HolderManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e) {
What I need is to be able to pass in an extra parameter in the event such as...
private void HolderManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e, CompositeTransform mv) {
However this seems to be invalid. I've tried googling and got some stuff on delegates etc but I cant get my head around it. Can anyone help me out?
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Are you trying to find a way to make the third parameter optional?
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By default there is no third parameter and when i try and add one I get the error message:
"No overload for 'HolderManipulationDelta' matches delegate 'Windows.UI.Xaml.Input.ManipulationDeltaEventHandler'"
I'm looking for a way to add the third parameter in.
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You may want to look into using override. I can't find any tutorials that might help you and I'm not exactly an expert on the subject. But it might be worth while to search on your own as you'll know better what you need.
Edit: The override function is used for changing things in classes and such, from what I can gather.
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There's nothing to override here. If you change the signature of a method, you are adding a new method, not overriding an existing one.
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How does the CompositeTransform get created?
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I'll add a bit more of the code. The compositetransform is created along with one of the xaml components.
public void NewButton_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
Canvas newcanvas = new Canvas();
CompositeTransform mv = new CompositeTransform();
AppGrid.Children.Add(newcanvas);
Ellipse Holder = new Ellipse();
Holder.ManipulationDelta += new ManipulationDeltaEventHandler(HolderManipulationDelta);
}
private void HolderManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e){
This code compiles, but I need to add the third parameter into the holdermanipulationdelta event, and when i do that i get the error message above.
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Why don't you make "mv" a class member? If you don't want to go that route for some "insane"  reason, you can do what you want with lambdas:
Canvas newcanvas = new Canvas();
CompositeTransform mv = new CompositeTransform();
AppGrid.Children.Add(newcanvas);
Ellipse Holder = new Ellipse();
Holder.ManipulationDelta += (x, y) =>
{
HolderManipulationData(x, y, mv);
}
That'll work, but I'd make it a class member since that's more "proper" IMO .
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I'm fairly new to coding and was just trying to bodge it together quickly before figuring out the proper way to do it haha. Might sound a bit silly but it's the way I learn best. Thanks for your help I'll give that a go 
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The standard convention in .NET for event delegates is to have just 2 parameters, the first is the object that generated the event and the second is a class derived from EventArgs that provides more information about the event. Note that this is not a hard and fast rule and you can have as many parameters as you like, but sticking to the convention makes your code cleaner, readable and maintainable.
You can compose your CompositeTransform class inside ManipulationDeltaRoutedEventArgs as an instance field.
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Cheers for your response. As I said I'm fairly new to this and I wasn't aware this was an option. I don't suppose you have a link to any good resources/tutorials on doing this so that I can read up on it?
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I consider SledgeHammer's response, using a Lambda, as the best, elegant solution (and I'm not competent in WPF/XAML), but I am curious, if you are defining a custom EventArgs class for use with your EventHandler:
Why could you not add another parameter, of whatever 'mv's Type is, to that custom EventArgs class; then in your explicit EventHandler implementation which is "wired-up" to the Event, you can test if that instance of 'mv is null, and ignore, or, if not null: do whatever you want to do ?
If this question is (and I fear it may be) way out-of-focus, I appreciate being corrected !
best, Bill
"Everything we call real is made of things that cannot be regarded as real." Niels Bohr
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