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As Luc had been telling you yield is one way.
When using Console.ReadLine you were stopping the execution at some point correct? Essentially the same as calling the CancelAsync method on a BackgroundWorker object, again as Luc has suggested to you.
Again, IMO, you are making it much more difficult than it needs to be. You should be able to search breadth or depth from any point, not start at the beginning and wait for input.
I know the language. I've read a book. - _Madmatt
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if i stop by Console.ReadLine(), the algorithm execution pause until user inserts the input. but the pause in specific recursion level.
after the input was inserted, the algorithm continue to run from the point it paused.
If i'll use CancelAsync and exit the thread, how i would be able to return to the exact point it was stopped ?
modified on Monday, December 6, 2010 5:05 PM
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You have a poor algorithm if it must pause and wait for input and can't be reentered. IMO.
If you have to pause and wait for input then consider a Workflow, which from your description is what you should be using anyway. and I suggested to you yesterday.
http://msdn.microsoft.com/en-us/library/dd851337.aspx[^]
I know the language. I've read a book. - _Madmatt
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Thanks for the link...
I'll read it
I assume i was need to use it any way, but a problem that Software Engineering in Uni is not so developed as it should be
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if you want real synchronization between two threads, there are several tools available for that. Have a look at ManualResetEvent and AutoResetEvent classes. The pseudo-code could be:
public string WaitForUser(string message) {
...
myAutoResetEvent.WaitOne();
return someGlobalVariable;
}
public void myButton_Click(object sender, EventArgs e) {
string s=myTextBox.Text;
someGlobalVariable=s;
myAutoResetEvent.Signal();
}
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Why on earth are you interacting with a console application from your WPF application? It sounds like you're really making problems for yourself.
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Pete O'Hanlon wrote: Why on earth are you interacting with a console application from your WPF application? It sounds like you're really making problems for yourself.
I started with console, i'll move it to class library, and eventually i'll add a dll as a reference.
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Do it right the first time and it will save you considerable work and problems.
I know the language. I've read a book. - _Madmatt
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Fair enough. That clarifies things a lot - for a moment, I was worried that you were asking questions in the console app. Anyway, Luc's suggestion is as reasonable as any other you're likely to get and the syntax is nice and straightforward.
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igalep132 wrote: is it possible to fire events between threads ?
No.
Event handlers are executed on the thread that raise the event.
Although... what about avoiding cross-thread WinForms calls in events?...
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i can`t make it in textbox
but in masked textbox i make the mask "00\0000" but user can enter month greater than 12 so i want to restrict this
or make valdation type the mask follow so user can`t enter > 12 or <1 or > this year
how ?
or can i make new type ("mm\yyyy") 
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Rather than a MaskedTextBox, why not use a DateTimePicker? That way the date is always valid, and it is obvious regardless of locale.
If you can't, then you would be best to use a ValidatingType property[^]
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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Hello Mohamed,
I don't know if it would fit in your scenario, but I'd advise you to try to use a datetime picker where Format property is set to custom.
Cheers
Manfred
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thnx to all
ok .... how to create new type in C#
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The maskedtextbox is described here[^], and it's usage is explained with a nice example at the bottom of that page. You'd set the mask to "00/0000" according the example, but I bet that it takes somewhat more customizing than merely changing the mask.
Mohamed Nabawy wrote: can i make new type ("mm\yyyy")
You could create a new class that encapsulates both a month and a year. The current edit-controls would not know how to interact with your class, unless you also create a TypeConverter.
I suggest you keep it simple and put two textboxes on that form; limit the keys that can be entered to numbers. Done
I are Troll 
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I'm trying to make a simple web browser with tab support and am having difficulty with getting pages to load in the right tabs.
I can make new windows and tabs and switch between them, however the web page typed in the address bar always loads in tab 0. I've never really used tab controls before and I'm kind of learning as I go.
I think I need somehow to almost dynamically name each new instance of webBrowser so they can be accessed individually but I don't know how to go about something like that.
Here's what I've got so far
private void toolStripTextBox1_KeyPress(object sender, KeyPressEventArgs e)<br />
{<br />
if (e.KeyChar == 13)<br />
{<br />
int currentTab = tabControl1.SelectedIndex;<br />
MessageBox.Show(currentTab.ToString());<br />
webBrowser1.Navigate(toolStripTextBox1.Text);<br />
}<br />
}<br />
<br />
private void Form1_Load(object sender, EventArgs e)<br />
{<br />
webBrowser1.Navigate("http://www.google.co.uk");<br />
}<br />
<br />
private void newWindowToolStripMenuItem_Click(object sender, EventArgs e)<br />
{<br />
Form nextWindow = new Form1();<br />
nextWindow.Show();<br />
}<br />
<br />
private void newTabToolStripMenuItem_Click(object sender, EventArgs e)<br />
{<br />
TabPage nextTab = new TabPage("Google");<br />
tabControl1.TabPages.Add(nextTab);<br />
tabControl1.SelectedTab = nextTab;<br />
WebBrowser webBrowser1 = new WebBrowser();<br />
nextTab.Controls.Add(webBrowser1);<br />
webBrowser1.Dock = DockStyle.Fill;<br />
webBrowser1.Navigate("http://www.google.co.uk");<br />
<br />
<br />
}
Thank you for any help
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Hi,
here are some thoughts:
1.
seems you have a TabControl with one TabPage+WebBrowser added in Visual Designer; and inside newTabToolStripMenuItem_Click() you have code to add a TabPage+WebBrowser at run-time. This makes your first TabPage technically different from the future tab pages, not a very good idea:
Right now the first tab page has its WebBrowser kept in a variable webBrowser1 which is a class member of your Form; it is therefore the one that gets used in toolStripTextBox1_KeyPress(), no matter which TabPage is currently visible. The extra tab pages have a local variable, also called webBrowser1, but that only exists in the scope of newTabToolStripMenuItem_Click().
2.
almost all web browsers (e.g. FireFox) support tabs, and show a single TextBox for entering a URL; however the content depends on which TabPage is current. There basically are two ways to achieve this:
(a) really have a single TextBox and switch its content whenever the tab pages get switched;
(b) have a TextBox for each TabPage, all at the same Location, however all but one invisible. This might be easier.
3.
This is what I would do (assuming a Form called MyBrowser):
- with Visual Designer add a TabControl without Tab Pages to MyBrowser; and an invisible TextBox for URLs ("tbDummyURL").
- create a "BrowserPage" class that holds everything about a single tab page, including a TextBox "tbURL" and a WebBrowser "browser";
- create a variable MyBrowser.currentBrowserPage that holds the current browser page (initially null);
- create a method BrowserPage MyBrowser.AddTab; it would instantiate and return a BrowserPage, add its TabPage to the TabControl, set its TabPage.Tag to itself, and set its TextBox.Location to tbDummyURL.Location without making it visible.
- create a method MyBrowser.ShowTab(browserPage); it would set currentBrowserPage.tbURL.Visible false (unless null) and browserPage.tbURL.Visible true.
Then at run-time probably immediately create and show the first tab; whenever some button gets clicked create and show an additional tab; etc.
refinement: if you have another button to close the current tab, you need to remove the TabPage, and show again the previous tab. The proper way would use a most-recently-used approach, which you can implement with a List<BrowserPage> in MyBrowser. Then ShowTab(browserPage) should remove browserPage from the list, and add it again, effectlively moving it (if it was already in the list) to the last position in the list. So, closing a tab would remove it from the list, and the now last entry, if any, should be shown.
This may be a bit much, I suggest you try it step by step. Ask again if you get stuck (but please use PRE tags, not CODE tags, for code snippets).
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Thank you, that makes a lot more sense now, should be easy enough to change what's affected by the address bar with a tab index changed event or similar.
I'll let you know how I get on,
Thank you
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you're welcome.
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Well I am sad to say that I have usually avoided inheritance because I don't have a full understanding of it and/or I haven't yet found a good use for it.
So my newest learning project is a client / server (have been posting about it you may notice alot). A brief overview of what I have been doing is passing my custom object over TCP. My custom object is a seperate DLL project.
Erik didn't like it but to be honest I haven't came up with a better way or fully understood. AFter reviewing hie article that he pointed me to I'm just wondering if I should be using a interface and/or inheritance.
Here is my Commons object:
[Serializable]
public class Commons
{
public Commons()
{
TimeStamp = DateTime.Now;
}
public enum Tasks
{
CHECKIN,
DISKDRIVE,
DRIVEINFO,
FAN,
MESSAGE,
PHYSICALMEMORY,
PRINTERS,
PROCESSES,
REGISTER,
SERVICES,
SOFTWARE,
ADD_CMD,
CLOSECD,
GET_ALL,
REBOOT,
OPENCD,
SHUTDOWN
}
public Tasks Task { get; set; }
public Tasks AddTask { get; set; }
public DateTime TimeStamp { get; set; }
public string AgentId { get; set; }
public string Netbios { get; set; }
public string IpAddresses { get; set; }
public string PhysicalAddresses { get; set; }
public string Message { get; set; }
public int LocationID { get; set; }
public Software[] Software { get; set; }
public Services[] Services { get; set; }
public DiskDrive[] DiskDrive { get; set; }
public DrivesInfo[] DriveInfo { get; set; }
public Memory[] Memory { get; set; }
public Printers[] Printers { get; set; }
public Processes[] Processes { get; set; }
public Fan[] Fan { get; set; }
}
Now those other classes look like this:
[Serializable]
public class Printers
{
public string PrinterName { get; set; }
public string PaperSizes { get; set; }
public string PrinterResolutions { get; set; }
public bool SupportsColor { get; set; }
public bool IsDefaultPrinter { get; set; }
public bool CanDuplex { get; set; }
public bool IsPlotter { get; set; }
}
So getting an idea of what I'm trying to do, I am wondering if a situation like this will best serve using a interface and/or inheriting a class? I get the idea, you implement a interface, you inherit a class.. but like I said I haven't put together a good use for something I'm trying to do.
Now what I am doing with this data once it reaches the server is inserting it into SQL. If a client gets the TASK == PRINTERS, then it will perform a lookup using WMI of all local printers, poopulate the Printers[] array and send back to the server. So server gets the TASK == PRINTERS and see the Printers[] array is populated and proceeds to insert that data into SQL.
Sorry if this question is kind of broad.
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Jacob D Dixon wrote: I get the idea, you implement a interface, you inherit a class..
So you understand more than many here. 
In most cases, I define an interface and an abstract class to act as a base for other classes. However, maybe you don't need a hierarchy of classes at all. I was playing with WCF last spring and didn't need a hierarchy of classes. With a Web Service, your client usually makes calls to different methods of the server, rather than sending different commands to one method.
I guess I'd need a higher-level overview of what you're trying to accomplish to give a better answer. The big question is... Is this an actual thing you need? Or merely an exercise to learn new things?
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PIEBAL,
Everything I do is just an exercise to learn new things. I'm not currently a programmer or in school for doing this stuff. (I am in school for programming but they teach you very basic crap, and nothing like this... at least the school I'm in).
I'm currently a Network Engineer and setup this software called LabTech. It is a remote monitoring / control application. You have your server out on the internet, and install agents to different locations (different networks). They report stuff like hardware, processes, services, and more. I know that it is made with VB.net and possibly some C#.
Anyways I just wanted to try to make my own applicaton that was similiar. So far I have my server and agent. They communicate and transfer data (my Commons object) over TCP (Socket Class).
The server holds in memory "pending commands". With each Commons object is arrays, Agent ID, and other things (you can see this class in the first post). So basically we are just transferring that back and forth. So when the agent checks in, the server looks in memory (a List<commons>) to see if there are any Commons object that pertains to that agent (by AgentID.. GUID).
So lets say I want a certain agent to get a list of processes and return to server. I manually add (for right now) a commons object to the List on the server.
The agent checks in.
Server queries the List<commons> object for objects that match that Agent's ID.
Server returns array of Commons[] object (because it might have more than one command) to client
Client performs the commands
Client returns array of Commons[] object to server
Server loops through and inserts the data into SQL.
So if we are wanting the agent to get its Services and send to data we will set the Commons Object TASK to Services and the client will populate the Services[] array (Which is just another class that holds stuff like ServiceName, Status, etc).
For this exercise I rather not use a web service. I wanted to learn more about TCP protocol. The server is using the Socket class asyncronous and the client is not. Here is a post where Luc helped me out with my server's Socket implementation:
http://www.codeproject.com/Forums/1649/Csharp.aspx?fid=1649&fr=151#xx0xx[^] (this is working fine).
Hope that helps you understand more of what I'm doing 
Note:
And of course I can always send you my project if you wanted lol.
modified on Saturday, December 4, 2010 11:22 PM
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Oh, yeah, OK. Personally I'd use WCF, but learning sockets can be good too (I have done very little of it). A more advanced technique would be to have the communication layer abstract, perhaps with a plug-in*, so the client and server don't actually know or care how the communication is performed (as long as they are both configured the same).
I'll re-read the other post and see if I can think of anything else.
* Which also usually uses an interface and maybe an abstract base class.
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I think using a web service would make the task easier. I just want to get a handle on Sockets and a good "design" of a client / server model. Erik also suggested the same thing as you about the communication layer. Saying that the server should handle anything thrown at it pretty much. I just haven't been able to wrap my head around his suggestions on how to make it work for me for this particular project. I mean technically right now it does handle everything. It detects if it is a Commons[] object, and if it is then does something with it. If it isn't a Commons[] object then it just does nothing with it.
But the way I have it designed.. any future updates would require the server to be updated (which would mean the agents couldn't check in at that time), and the agents to be updated depending on what is being added. Like if I wanted to make v2 be able to reboot the agents to safe mode, then most likely it would require a server & agent upgrade. I just don't see how to get around doing this task without an upgrade later on.
I hope that makes sense. I guess I'm just looking for pointers on making my classes more "professional" and easier to manage. I mean I think they are easy to manage because I built them lol.
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The socket-oriented communication to a third-party system that I had to do on my last job was very simplistic (circa 1980s?). It was strictly ASCII text -- the first two characters were the number (type) of message, the next four characters were the length of the message, followed by the data of the message. I used an enumeration (as you did) to hold the message types, but I had no need of defining a hierarchy of message classes.
I just took a quick look at my code and I see that I defined one class, which derives from EventArgs; it is used for sending and receiving the messages. Received messages are passed up the chain by events. Sent messages are passed along to the log via events. Otherwise I probably wouldn't defnie a class at all. The Windows Service that performs this communication merely reads new messages from a table, sends them, and marks them as sent; and reads messages from the socket and inserts them into the database (marked as received). Other Services handle entering messages to send and dealing with responses.
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