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Visual C# General

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  - 1
    - Threading synchronization Don't know if this helps....I had a program that used to monitor incoming UDP socket for specific messages from multiple internal webservices on different servers. That program would have to dynamically create and push data to multiple tabs which would then route the data to into various controls upon the tab page. I found that by creating a timer and having the timer collect the data and do the creation of the tabs and subsequent data distribution processing was the most effective. Any callbacks or invokes would only push data onto queues which could be locked for thread safety and those queues would be emptied only by the timer data manager. That way only one process is responsible for pushing data towards the GUI, it was a centralized Flight Tower so to speak and that would kick off to an internal drum beat. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 2
    - Abstraction Abstraction is concerned with hiding, or providing detail at a later date. An class that is abstracted is something where you provide an interface that must be implemented within the class, but that class itself contains no implementation itself. The difference between an abstract class and an interface is that the abstract methods could be implemented by a derived class as well as the base class providing some functionality, or implementation as well. An interface merely defines the contract the an implementation must adhere to, to be considered able to communicate using that interface. So a short example could be, and clearly this won't compile, but will give you some ideas and keywords to search on... public abstract class SomeClass { . . public abstract void SomeMethod . public void AnotherMethod() { Console.WriteLine("Hello.") } . } Then a derived class: public class SomeOtherClass : SomeClass() { // You have to provide the implementation here, as this is abstract... public void SomeOtherMethod() { Console.Writeline("Hello again."); } . // Note that you get AnotherMethod() for "free"... . } I hope this helps you, as the above is a pretty simplistic answer. If it doesn't make sense, shoot me another post, and I'll try again! Martin. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 3
    - How to replace "\\" with "\" I need the startup directory to pass it to an external program as command line argument. I know I can split up application startup path along \\ with String.Split() and recombine the pieces with @"\" but I always expect something more - obvious and of course done by someone else earlier Here is the code, I don't think it would matter: Code Snippet Process p=new Process(); string dest=@"DestDir\xyz.txt"; ... p.Arguments=Application.StartUpDirectory+dest; p.Start() Tag: Visual C# General Still Active Though Log Off Visual C#
  - 4
    - Accessing rows/columns in MultiDimensional Arrays Since it is up to you to define the width of a multidimensional array, you can simply divide by that width. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 5
    - How to convert Parameterized Delegate from C# to VB.Net? Just isolate enough code to demonstrate the issue and post it here. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 6
    - C# still going strong? Well I'm definitely not a VB.NET basher...it is a great language with some advantages over c# (such as background compilation)...i'd encourage you to take a look at this excellent posting . Out of necessity I've worked quite a bit in both languages and despite the neverending debate I think one vs the other comes down to personal preference rather than one being clearly superior. Before .NET came on the scene is was largely Visual Basic vs C++ and the argument was somewhat less hazy. If you came from a VB background chances are you migrated into VB.NET. Due to the steep learning curve there were always more Visual Basic programmers than C++ programmers and so it stands to reason that the rationale behind seeing more VB.NET examples than C# ones comes down to the 'squeaky wheel gets the grease'. Personally I haven't seen a predominance of VB.NET over C#...if anything it has been the reverse. Case in point...most conferences I go to (the most recent was the Houston TechFest) the speakers ask at the beginning of the session whether the preference is for C# or VB.NET code samples and every single time it is more heavily weighted towards C#. Personally I use C# whenever possible because I think it helps enforce better practices whereas VB.NET tends to take a more lenient approach. Last but not least most contract opportunities are very upfront about things being written in C# because VB.NET has not quite, for whatever reason, shaken its misperception as a weaker language so it is more financially rewarding for me to focus on C#. The reality is that in the hands of a professional programmer...VB.NET or C# will produce the same high quality code...the perceived differences would more rightly be attributed to the skill of the person at the keyboard. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 7
    - Array as a buffer in multithreading Hello! I have an array of MemoryStreams. The main thread is updating one element at a time and the other threads are iterating over the array and checking if they are free to read the elements. If a MemoryStream is locked in the array, they won't read it and continue to another MemoryStream in the array. How can I implement this scenario I'm using the array as a buffer, the threads are reading from it and sending data over network, that's why I can't allow the main thread do the work of reading and sending the data. I need to make the other threads recognize and not read the element that is being updated. Thank you Tag: Visual C# General Still Active Though Log Off Visual C#
  - 8
    - Completely Invisible/Hidden Application Still shows up in the task-manager, which was one of his pre-requisites. A Windows Service will only show in the Processes. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 9
    - while loop error--need help Seems to me the big problem your having is that -1 can never appear. Read returns 0 when it reaches the end of the stream, not -1. As can be seen in the remarks section of MSDN http://msdn2.microsoft.com/en-us/library/system.io.filestream.read.aspx Have fun, -mwalts Tag: Visual C# General Still Active Though Log Off Visual C#
  - 10
    - Losing value after calling method for use with another Lets explain again. Focus on this piece of code first: if ((String.Compare(lastAlbumTitle, currentAlbumTitle,true) == 0) || (firstAlbum == 1)) { AddNewProduct(xl, row, host, fileExtWAV, " Album ", filePathSourceWAV, fileName, moveFile, sstore); //Album WAV } else { AddNewProduct(xl, row, host, fileExtWAV, " Track ", filePathSourceWAV, fileName, moveFile, sstore); //Track WAV } What's happening and where the probelm is: 1) The loop starts. Through first iteration of the Loop, this is called: AddNewProduct (xl, row, host, fileExtWAV, " Album ", filePathSourceWAV, fileName, moveFile, sstore); it goes through and creates the JAAAlbum object, populates it with some values, and does it's thing as you can see and finishes 2) Now we iterate through the loop to the 2nd Excel record, this time, it evaluates to the else in the if statement and runs this: AddNewProduct (xl, row, host, fileExtWAV, " Track ", filePathSourceWAV, fileName, moveFile, sstore); Ok, all I'm saying is that in that in the call to AddNewProduct(xl, row, host, fileExtWAV, " Track ", filePathSourceWAV, fileName, moveFile, sstore); the JAAlbum object is lost from #1 and it's values are lost including ProductID . So in other words I do not know why JAAProductID object is out of scope or is garbaged...I need it for my second call for the AddNewProduct for Track because I need to pass both the Track's ProductID and Album's ProductID to my AddNewProductRelationship_Album_Track method Tag: Visual C# General Still Active Though Log Off Visual C#
  - 11
    - Restricting parameter values? use .ToString() method to get the string from Enum datatype. U can't use spaces in between the string in this case. U can also throw the exception for restricting. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 12
    - How to return and use a value from one method call to another Hi, if you want to make the variables static then you just need to declar them static inside your class i.e. class X { private static int myValue; ... In regards to your compiler errors, "not all paths returns a value" means there is some way your code can execute that means you do not hit a "retux x" statement, your method returns a long, however inside the switch case for "track" you do not return any value, your code will then exit the switch statement but there is no return statement also, the function always has to return something. The unreachable code detected is telling you that you have some code that will never execute, probably because you have a return statement before some code i.e. public void Foo() { return; int i = 1 + 2; //this is unreachable and will never be executed. } Mark. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 13
    - How do I Retrieve text from other programs? Here's something I found that lines up with what I expected you would have to do for a graphical window: drill down to the correct window handle and then either send it a WM_GETTEXT message or find some other way. WM_GETTEXT will work if it is a standard Windows control. >> Use the tool Spy++ (that came with MSVC) for you to learn about window hierarchies, and in particular the hierarchy relevant to the specific other application you're going to be working with. You must figure out, using Spy++, how you're going to "drill down" from the desktop through successive child windows until you get to the text box. Once you've figured out how, you'll have to code this "drilling" yourself, using FindWindow/FindWindowEx/GetWindow. If it's one of the standard text box controls, you'll be able to send a WM_GETTEXT (equivalently, GetWindowText()) to it. (I think you can at least... I think there aren't any cross-process problems with getting the window text). If it's a custom control that doesn't support this, then all bets are off, and there's no general solution. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 14
    - cannot find dll Is the .dll located on the other computer Please provide the code with the directory referece. Adamus Tag: Visual C# General Still Active Though Log Off Visual C#
  - 15
    - Calendar I'm so rry, but I still fail to understand your problem. I'm from Uruguay, and if I was to make a calendar, CultureInfo.CurrentUICulture.DateTimeFormat.GetDayName(DayOfWeek.Friday) would return "Viernes"... and that's pretty much what I would want. Can you help me understand what the problem is Tag: Visual C# General Still Active Though Log Off Visual C#
  - 16
    - Rotating Two Dimensional Arrays sorry, but i do not follow what you mean Tag: Visual C# General Still Active Though Log Off Visual C#
- Next
  - 1
    - OnClientClick Priority? try change your code "<input type="submit">" to "<input type="button">". because if the button's type is submit, it will be submit the data when you click the button. and other feilds will be clear. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 2
    - where to find static definitions I thought that when you marked a method and class as static that all the objects that the class and methods use have to also be static. Is this not the case Tag: Visual C# General Still Active Though Log Off Visual C#
  - 3
    - Math with datetime?? There is no "one" answer to this problem. It is all a matter of how you define "age". You haven't provided a rock solid definition of "age" (which, of course, needs to say what to do about the differences in the number of days per month). Tag: Visual C# General Still Active Though Log Off Visual C#
  - 4
    - Error code: 0xe0434f4d Default .Net security does not allow you to run .Net programs directly from a network share (this is a Good Thing). Normally, you have to copy a .Net program to a local drive before you can run it. However, in your case this looks like it is not possible. One way around it is to change the local machines security policy to allow .Net programs to run from a network drive. (From Control Panel|Administrative Tools -> .Net Framework 2.0 Configuration, and it's somewhere in there...) Tag: Visual C# General Still Active Though Log Off Visual C#
  - 5
    - app.config or settings.settings Application settings are stored in the app.config file. You'll find a section that contains each of your settings along with the type and default value. This allows the application at runtime to get access to the default settings available. If you define a setting as user scope then the setting will also be stored in the user's local config file (since they won't have write access to the app config). This probably only occurs when the user changes the setting (through your UI). Nevertheless the app.config holds the settings for the application plus the defaults for the user settings. Now settings.setting is a code file. If you open it up (the actual source file, double clicking will take you to the project's settings page) you'll find that it is nothing more than a class that exposes each of the settings from the config file as properties. This allows you to programmatically access the settings at runtime without having to interact with the configuration subsystem (which is how you access the app.config) file. You almost never should mess with the settings.setting file. It is dynamically generated each time you use the project property pages to add or edit a setting. You should also normally not muck with the app.config settings either as you might mess up the syntax. Instead you should use the project's property pages to add and edit settings. However if you wanted to, for example, copy the settings from one application to another you could open the app.config file and copy the section from one application to another. You would then need to open the project's property pages to force the IDE to generate/update the settings.setting file. Michael Taylor - 12/28/06 http://p3net.mvps.org Tag: Visual C# General Still Active Though Log Off Visual C#
  - 6
    - closing app probs ahmedilyas wrote: Perhaps your application is still doing something in the background Such as creating another thread which is still running and hasnt finished yet What does your application exactly do Are you sure your are not looking at the application .vshost instance in task manager whilst you are running an instance of VS with that solution loaded (some people do get confused) the aplication uses a while loop(BoolExit =! false) to check if a process is running. if the process exited the app will start the process again.(a restarter) If i click the stop Button (BoolExit = true) and the loop will break. Some of the user i got they dont click the stop button they only click the X button to exit. the while loop stays open and the app windows closes, and the process keeps restarting. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 7
    - calling an executable from within running app I have been looking for a couple of days now and I suppose I am just looking in the wrong places. As I have recently started migrating my knowledge from that of C / C++ to C# so I still have much to learn; However I would be most grateful if someone could point me in the right direction. Have also performed multiple searches and perhaps I am just not succint enough in what I am typing to find that which I seek. While keeping in mind I am also just now learning to program within Windows most all previous experience within C / C++ has been within Linux / Unix and previous to that was all assembly and C/C++ within DOS years back. So, I have much to learn reiterated once more. I am looking for something within the C# language that would be equal to that of the C - ansi / posix function 'system("foobar.exe");' So that I can call an executable from within a running app. TYVM in advance Erin Ferguson-Stange Tag: Visual C# General Still Active Though Log Off Visual C#
  - 8
    - Best way to marshal an array of C style strings Yes. Another option is to split the field into seven different strings of length 30 if that's more conventient. You can also use a char[] instead of a string if you prefer. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 9
    - How can I control already open IE windows? I ended up using SendKeys and creating a new instance of IE each time a user clicks on the button. Some helpful links I came across: http://msdn2.microsoft.com/en-us/library/66ahbe6y(vs.71).aspx http://www.webtropy.com/articles/InternetExplorer.asp Internet%20explorer Tag: Visual C# General Still Active Though Log Off Visual C#
  - 10
    - How to make a tabpage invisible from user? Help Thank you very much. Tag: Visual C# General Still Active Though Log Off Visual C#
  - 11
    - VB6 ActiveX Dll Problem ! After compiling a activeX dll in VB6. I had tried to use it in my C# application : [DllImport ("MyLib.dll",EntryPoint="Function1")] private static extern int MyFunc (int _num); -> I get an exception "Entry Point not found !" It's my activeX Dll code : public function Function1 (byval num as long) as long ..... How to reuse this dll, Somebody help me ! Tag: Visual C# General Still Active Though Log Off Visual C#
  - 12
    - Add a Menu to the IDE I want to Add a seperate menu to the visual C# IDE! is it possible...to do add a seperate menu to the default visual studio 2005 IDE. (Say after the HELP menu.) OR putting as another item in an existing menu. (Say in the TOOLS menu) how to do it!..is it possible Tag: Visual C# General Still Active Though Log Off Visual C#
  - 13
    - How to check whether the system is 32 bit or 64 bit ? Hi Martin, Thanks for the reply. I have two applications. (a) A Window App on which the code is working fine to give the OS Version as intended. The OS is 64 bit and it rightly displays (b) An Outlook VSTO Addin (A plugin which gets added in Outlook 2007) but the same code says that the OS is 32 bit. Both of the above applications have been developed on a 32 bit machine. Any ideas Tag: Visual C# General Still Active Though Log Off Visual C#
  - 14
    - how to call a function of another class hi i am trying delegate but i have been having trouble with an error talking about cant deserialise at the security level i recenrly found a way for it to be solve but the code is in the app.config file <serverProviders> <formatter ref="soap" typeFilterLevel="Full" /> </serverProviders> how can i add it into my code to cater my program can help me Tag: Visual C# General Still Active Though Log Off Visual C#
  - 15
    - Please help me with C# code I've just started C#, but I have been doing some terminalIO stuff in java and one of the java apps calculates pi. the math should be the same.---- import java.util.Scanner; public class PiCalculator{ public static void main(String[] args) { // Declare Variables Scanner reader = new Scanner(System.in); double pi; double x = 1; double count = 0; double no = 1; double pi2 = 0; double end; double piCurrent; //request input System.out.print("Enter number of iterations: "); end = reader.nextDouble(); //Calculations while(count < end) { pi = pi2 + (no / x); x += 2; no *= -1; pi2 = pi; piCurrent = pi2 * 4; count ++; } pi = pi2 * 4; //Display the value System.out.println("The value of pi after " + end + " iterations is " + pi + "."); } } Tag: Visual C# General Still Active Though Log Off Visual C#
  - 16
    - Trim transparent whitespace from Image I would like to trim the alpha whitespace from an existing Image (read from a png). For example: A big transparent image with a small solid circle somewhere shall be trimmed down to a rectangle bearing the circle. Is there some high level method I can use Tag: Visual C# General Still Active Though Log Off Visual C#

Han Qiao

Hi,

I need to make my application so that it won't closed when the windows Log Off.
I did cancel form_closing event, but it makes the system can't Log Off.

Why i need this ...............................Remote Log On.

Is that possible using C#

Thanks in advance

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Re: Visual C# General Still Active Though Log Off

Appel

What do you mean with Remote Log On

If you want your application to always run you can create a Windows Service. Then that service can listen for incoming remote or local connections from clients.

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Re: Visual C# General Still Active Though Log Off

Han Qiao

Log On to other machine remotely. So far my boundary just for LAN connection.
Cool... never thought it is Windows Service.

Thanks a lot.

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