Set Limit To The Number Of Threads For BackgroundWorker?
Mar 17, 2011Is there any way/property to set BackgroundWorker to execute only x number of threads?
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How To Run Multiple Threads With BackgroundWorker
Jan 13, 2010I am writing a project in Visual Basic where I need to run several instances of the same method in parallel. I can do this using BackgrooundWorker by having several (4) copies of my code module (modules 1, 2, 3 and 4) with a call to background worker in each. I then have a Main form which invoke the 4 modules which setup 4 simultaneous background threads. Seeing as the code is the same I want to simply invoke the same module 4 times.
However when I do this I get an error from Backgroounworker that it is already busy. As I understand it this means that it is being shared. However, I have specifically instantiated it as "private" (private with events worker as new backgroundworker). I have tried running the same code in a Class instead of a Module but unless I make it public I have no way of invoking it from Main. I need to be able to pass each thread data from main for it to work on and if the class is private I cant invoke it.
Limit To Number Of Events?
Mar 19, 2009I am working on an application that has a number of forms in it, doing asynchronous comms with a "radio network" over a serial port.To handle replies from the network in the appropriate form, I am using RaiseEvent. As time goes on, I seem to be needing more and more events. Is there a limit to the number of events that can be firing off at the same time?
I understand that computers can't actually do several things simultaneously, but obviously while the code triggered by one event is still running, another one might fire.
C# - Limit On Number Of Classes That A Namespace Can Have In .net?
Aug 9, 2010Is there any limit on number of classes that a namespace can have in .net ? Further what is the recommended number of classes that there should be in a namespace?
View 8 RepliesHow To Limit Random Number Range
Apr 16, 2009How could I limit the random number range? For instance, limiting the number within the range of 1-100.
View 5 RepliesLimit The Number Of Decimal Places?
Jan 29, 2010ive done a bmi calculator bbut the end result has 4 or 5 decimal places when i only need one. how do i limit the number of decimal places
View 3 RepliesLimit The Number Of Decimal Values To 3 In Numbers?
May 3, 2010I'm trying to limit the number of decimal values to 3 in numbers such as .3125 but I also have numbers such as .5 which I need to leave as is.
how can I determine if a number is 4 decimal places and cut off the last number.. I don't want to round up either.. .3125 should be .312 not .313 and .5 should stay at .5 and not .500.
Run X Number Of Manageable Threads?
Mar 23, 2011How can I make an application to start only "x" number of threads at a time?
View 1 RepliesVS 2010 Get A Max Of Number Of Threads Available?
Feb 26, 2012I've written an app - that use httplisteners to talk to other winforms (they will be services but are now simple form apps so I can easily show stats as they communicate). One UI app talking to three other "service" apps - all talking to each other as well...Everything uses multi-threading...At any rate - how many threads do I have available - I see that most of the apps seem to run "two or three" consecutive threads - but not more than that.Is that just a byproduct of running in the IDE - or is there a max of number of threads available?When more threads are asked for than are available - do they simply wait to get started for a free thread to become available?
View 4 RepliesHow To Limit Number Of Character That Need To Be Enter In Data Grid
Jul 15, 2009In my datagriedview i have 5 column called T,C,F,S and H.I want to specify in column C that the user must enter 3 digit. For column H the maximun value should be 2000 so user should not enter more than 2000.how i can specify this condition for my datagriedview column?
View 2 RepliesLimit Number Of Character In Unbound Datagriedview Column?
Jul 15, 2009In my datagriedview i have 5 column called T,C,F,S and H.
I want to specify in column C that the user must enter 3 digit. For column H the maximun value should be 2000 so user should not enter more than 2000.
how i can specify this condition for my datagriedview column?
Number Game - How To Limit Amount Of Guesses For User
Sep 19, 2010I have wrote the code for a number guessing game. But cannot for the life of me think of how to limit the amount of guesses a user can have. This is in Console Application.
Module Module1
Sub Main()
'This program plays a simple number guessing game.
Dim RandNum As Integer
Dim RandomGenerator As New System.Random
[Code] .....
C# - Can The Number Of Foreground Threads Be Determined In .NET
Mar 8, 2011I've searched a good deal on the topic and have found little results. It seems adding foreground into the criteria on any engine I've used causes tons of entry level documents on threading in .Net.
In my current project I have a foreground thread within a static class that lies dormant until it is told otherwise. It contains a queue of items that must be processed and the items application cannot close without all items being processed. Right now I have a method that tells the thread that it should stop accepting new items and close when it is finished processing everything, but not everyone on the team remembers to call the method. Having the GUI close while the process still runs in the background is quite a bug in my opinion. If I can add a periodic check to see if the queued thread is the last foreground thread, then I can call the method and not have to worry about others that use the class.
How To Create A Dynamic Number Of Threads
Jan 6, 2010Currently I create a thread the following way (the normal way)
Public loginThread As Thread
Public loginThreadStart As New ThreadStart(AddressOf LogIntoWhatever)
Public callLoggedIn As New MethodInvoker(AddressOf loggedIn)
However, what I want to be able to do is something along the lines of (this obviously does not work, and is entirely pseudocode)
dim i as integer = 0
for i = 0 to i = 25
Public loginThread(i) as Thread
Public loginThreadStart(i) as New ThreadStart(AddressOf LogIntoWhatever)
next i
Public callLoggedIn as new MethodInvoker(AddressOf loggedIn)
Where I could change 25 to whatever I wanted and have that number of threads created. They would all be running an identical sub which does do not make calls of any kind to each other, they don't need knowledge of each other. Is anything like this possible?
How To Create X Number Of Threads Without Hardcoding
Sep 24, 2010[code]How do I create X number of threads without hardcoding?Eg. user decides the number of threads
View 1 RepliesWhat Is The Max Number Of Threads In The Thread Pool
Sep 22, 2009I've been reading up on multi-threading and just have a couple trivia questions that are ambiguous given my sources:
1) What is the max number of threads in the thread pool? The number 25 is used but I have on reference that says 25 per CPU and another that says 25 per core. I realize that both can be right but before I start making flagrant design decisions I'd like some validation.
2) Let's say I'm in the body of a delegate and I call a function or sub. Does that function/sub remain in the thread or does it revert to the parent thread? I'm guessing the former would be much easier to implement so that's probably what MS did but you just can never tell.
C# - Limit Number Of Rows That Can Be Entered In A Datagridview Based On Property Of DGV?
Feb 24, 2010I have a UI that uses datagridviews / bindingsource / datatables of typed dataset for data entry. The dataset itself is serialized to a varbinary(max) in SQL. (i.e. no tableadapter, backend schema).I would like to limit the number of rows the user can enter into some of the grids (the data is used to fill PDF forms and I don't want them entering more rows than the forms can accomodate.).I have subclassed the datagridview, added a rowlimit property and tried to manipulate the AllUsertoAddRows property
Imports System.Windows.Forms
Public Class dgv
Inherits System.Windows.Forms.DataGridView[code]......
The behavior I see is that the messagebox comes up after leaving the max row even when the user is trying to leave the grid. I can lose the messagebox and deal with notification some other way but I thought someone else may have come up with something a little more sophisticated to handle simply causing attempting to add to many records to navigate out of the grid to the next UI control.
Set Char Number Limit And Handle Special Chars In TextBox?
Jan 28, 2009I am a new VB programmer and am using TextBox in VB2008. Here are the problems I experienced in TextBox -
1, After I typed number in TextBox and found I need to type another number. So I used backspace key to remove it. But at this time program quit and displayed this problem: InvalidCastException was unhandled. How to solve this issue?
2, Can anybody tell me how to set number of characters are allowed to be typed in TextBox?
3, Can anybody tell me how to implement the feature that only numbers are allowed to be typed? In case letters are typed, how to tell user to re-type?
1 To N Thread - Show A Definite Number Of Threads?
Sep 3, 2009Does anyone have a 1 to n thread example in which n threads are created dynamically? There are a number of examples that show a definite number of threads, and some that imply n threads by using a tcp ip listener or a file system listener. However, I'm looking for a 1 to n created in response to a dynamic requirements, provided purely by and for my program.Essentially, my requirement is to be scalable. 1 to n threads based on application throughput should make this pretty easy to satisfy.
View 9 RepliesStart Multiple Threads But Not A Specific Number?
Dec 3, 2009I want to start multiple threads but not a specific number. For example;
private sub do_sth
...
end sub
[Code]....
.net - Sane Number Of BackgroundWorker Thread?
Apr 27, 2011I am writing an 'Admin Console' that accesses hMailServer via its provided COM interface. I am using Visual Basic 2010 Express. In one procedure, it scans for the whole accounts. Because it's a lengthy procedure, I shove it into a set of BackgroundWorker threads.
First result: A maximum of 19 simultaneous threads, with 36 seconds total time.Then I rewrote a time consuming thread initialization code segment, and managed to reduce the time required to approximately 14 seconds... but the thread count now hit 330 threads!Will that huge amount of threads be detrimental? E.g., causing out-of-memory exceptions &c. ?
VS 2005 Is There A Limit On Number Of Logical "AND" Usage In SQL SELECT
Aug 2, 2011is there a limit on number of logical "AND" usage in SQL SELECT? I used 4 in my code and it gives me a result but when I added one more, I dont see any error message but I didn't get any result when it should my give me a result.
View 10 RepliesMultithreading - .NET 4.0 Execute Multiple Threads But Threads Are Completed Before Resuming?
Oct 19, 2011I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.
What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).
What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?
Queue Threads - Spawn A Series Of 'child' Threads From A Loop
Dec 30, 2009I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
Limit The Number Of Characters Per Each Line Of A RTB To 1 Char Per Line?
Jan 20, 2010How do I limit the number of characters per each line of an RTB to 1 char per line? That is you type one character, after that the textbox should not accept further input on that specific line.-Knock knock -Who's there? -(looong pause..) Java
View 1 RepliesCancel Backgroundworker - Got The Error Message" This BackgroundWorker Is Currently Busy And Cannot Run Multiple Tasks Concurrently?
Dec 14, 2009in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
Backgroundworker Inside Another Backgroundworker?
Apr 2, 2012i'm in the need to start a backgroundworker inside another one.Now...The first one BGW starts a for cycle, and inside this one there is the second BGW that has to upload an image to a server.The trouble is that, the progress event and the complete event of the internal BGW are never called.
View 11 RepliesForms :: Use A If Statement To See If Fosters Button And Number 1 On The Number Pad Are Both Pressed Then Multiply Constant By Quantity Number?
Mar 4, 2011I am doing a bar cash register and I want to use a if statement to see if fosters button and number 1 on the number pad are both pressed then multiply constant by quantity number
View 1 RepliesDb Row Limit For Adodb?
Jan 23, 2010is there anyway to limit the rows selected in adodb?i had something like this
vb.net
Dim command As New OleDb.OleDbCommand("select*from Table order by Col1 limit 5", connection)
How To Limit Bandwidth Using Ftp
Feb 25, 2010how to limit Bandwidth using ftp
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