.net - Starting And Displaying Progress Of Multiple Synchronous Operations
Dec 2, 2009
I have a WinForms app and am trying to add the ability to start up multiple operations based on data entered in a datagridview. The operations must be run synchronously to monitor that they complete succesfully before inserting a row into the DB to indicate that the operation was succesfull. I also have a status event handler on the operation which will return the percentage of the running operation.
So far I am using threads to kick off the operations, however it is updating the progress of just one of the threads. When that thread is complete it is moving on the the next and will work that until completion. I would like them both or more to run simultaneously and be able to report the status of each.
I am basically looping through the rows in the grid and using the values there to instantiate a new class I created. I am then creating a thread and kicking off a sub to perform the operation from the new object. I think I may be close as I know they are all being started, but they are just running one after the other rather than all at once.
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Jun 18, 2012
I have some task regarding do operations on database using ADODB in Vb.NET.regarding using the same record set multiple times?
I have tried on this topic just by closing the recordset after performing First operation and doing second operation e.t.c.
In ADO.NET we have "MultipleActiveResultSets=True" in ConnectionString for SqlDataReader.Do we have any property like this in ADODB?
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Jul 31, 2011
I've got the bulk of a calculator up and working, however it doesn't like multiple operations. For example 3x5+2= brings up 10 (i.e. 3+5+2) and even doing it in two parts doesn't help, if I enter 3x5= I get 15 then +2= gives me 32 (i.e. 3x5=15 15x2=30 30+2=32). Also I am getting trialing zeros in my command line I can't debug.Note that lblcommandline displays the whole function and lbldisplay just displays the current imputted number.
Public Class frmSimpleCalc
'This code is run when the program starts. Here we 'declare' or basically, define which variables we want, what they are and such.
'So, for this example, we need two variables. The number we are CALCULATING and the one which we will CALCULATE FROM.
Dim lCalcNumberMaster As Long 'The master number is the solution, the number stored and displayed when we click equals.
[code]....
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May 29, 2010
I am trying to make a calculator that accepts multiple operations, similar to the calculator found on Windows.
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Jan 25, 2011
I am using the following code located here to upload files
Public Function UploadFile(ByVal oFile As FileInfo) As Boolean
Dim ftpRequest As FtpWebRequest
Dim ftpResponse As FtpWebResponse
[Code]....
I would like to extend it, so i can have an upload progress too. The problem is that i do not know from where to start. What is the "logic" of displaying the upload progress?
"Split the file" in predefined parts and upload them or what?
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Feb 16, 2010
I've asked this before, or something similar, but can't find it so I don't know what the answer, if any, was.
[Code]...
Now it seems to work fine, but I'm working with very large files (70+ GB) across a network (local copy is not an option) and while the function is executing if the user moves the application the screen can go blank and they can panic. What I want is a way to update something like a progress bar to give feedback to the user.
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Feb 3, 2009
Got a bit of a weird problem with a progress bar. I'm using a backgroundworker, which calls a "Process" function in a different class. The function goes about its business, and sends an update back to the form displaying the progress bar. What I'm finding is that its doing everything right, except update the progress and a label on the form. I've put breakpoints in to check the values of variables being sent to the form, and they're correct. I've also checked the value/maximum of the progress bar during the same break as I step through, and they're being set correctly.
they're just not displaying their updated status. I've tried refresh and application.doevents, to no avail. When the backgroundworker is complete, the values of the progress bar/label are as if I've never touched them! When the worker is complete, the Close button is enabled, so I know its finished. Anybody got any pointers/thoughts on this because I've been battling with this for a day and a half so far. I'm using the same technique as I've used elsewhere in the app to do similar backgroundworker progress updates, but this one refuses to work properly.
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Apr 2, 2009
I am writing an application which needs to allow the user to select and open document files as a new process, edit them, then when they've finished backup the changed files automatically. For example, start a .doc file within Word or a .xls file with Excel What I wanted to do was use process.start to run the application and store the ProcessID returned in an array so that when the process finished, I could check all the files that were using that application for changes.
[Code]...
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Nov 17, 2009
I have built and deployed an application in VB2008. If I start the program from the start menu a new session will start and there 'll be multiple sessions of the same programming running. I dont want this behaviour! I want the program to start only when no other session of the same program is running. How can I do that in VB2008?
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Jul 11, 2011
I have a VB2010 application that must run as multiple instances on the same PC (it is a controlling/monitoring program of several devices, each instance of the program control one device)
Of course, the same application must save its own setting in different place, one for each device. For example, if I start the application for the device 3, I have to save the setting in a place marked as "3", in this way, when I start the application for device 4 it will load the settings for device 4 and not 3.
Of course all labels and similar stuffs must refer the starting device: i.e. the mdi caption must report "device 4", and so on...
In vb6 I created a shortcut with a command line and made my application accepting command line parameters.
In this way I could start the application passing the device number too. For example "myapp.exe 3" start my application for the device 3.
I stored all settings in several INI file, each one for a device: setting1.ini, setting2.ini, setting3.ini, ....
I was wondering if in vb2010 would be a better way to do that.
1. How could I start multiple instances?
2. How could I store the settings?
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Jul 14, 2011
I'm trying to do this[code]...
But it still runs asynchronously. I need the browser to actually wait until my code-behind is finished executing, then it can be refreshed
There's a listbox loaded with values that were just deleted from the database, they shouldn't be visible. Problem I have is the window location refreshes before the code-behind is executed, and nothing seems like it was deleted to the user.
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May 24, 2011
Is there a synchronous wait function that won't tie up the UI-thread in .NET WPF? Something like:
Sub OnClick(sender As Object, e As MouseEventArgs) Handles button1.Click
Wait(2000)
'Ui still processes other events here
MessageBox.Show("Is has been 2 seconds since you clicked the button!")
End Sub
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Nov 13, 2009
I am running several long synchronous operations in my VB.NET application that can take several minutes each to complete. During these operations the form will turn white and the title bar will show "Not Responding" and some users may close the application thinking it has stopped working when in fact it is still running.I am pretty sure I need to multithread to do this, but my initial efforts have been unsuccessful. What is the easiest way to refresh my form every couple of seconds or so while these long operations are running?
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Aug 11, 2009
Here's my
[Code]...
During the file copy, Label2 isn't being updated. In fact, my whole form goes non-responsive. How can I fix this?
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May 13, 2012
I have to download about 100 small files so I did a multiple file downloader code but I have to add progressbar. [It will show total progress]
I found a solution in the code project [url] but has a problem in code.
Button codePanel1.Hide()
Me.ControlBox = False
Dim sr As New IO.StreamReader(filenames)
[CODE]........
My VS Version is 2011 but I have same problem in 2010 too...
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Mar 27, 2009
Is webbrowser.navigate method is synchronous or asynchronous?
example:
dim ct as integer =0
dim counter as integer =0
ct+=1
wbb.navigate(""http://www.yahoo.com")
counter+=1
will counter get increased after firing webbrowser.document completed event?
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Apr 2, 2010
I have a progress bar on a Windows Form which displays the number of records as they are retrieved from the database.The problem I'm having is that the entire Form.Load() method seems to run prior to the form being displayed, which means all my code updating the progress bar is gone to waste.
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Dec 5, 2010
So as it says in title i need to copy several files from one folder to another. But i dont need to copy folder with files. i need to copy several files to another folder..
And show progress in progressbar.. is there a way how to do it, cos i found only how to copy 1 file showing progress..
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May 13, 2010
I am building an application that will run through various tasks like database backup, zipping some other files and so on.I have the progress bar figured out for each individual task and I have all my tasks working.I am trying to build an interface to display to the user to show them the progress of the entire run.I was thinking like a list box or other object where I could put a green checkbox image or red x image as each tasks runs and is a success or failure.
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Oct 11, 2009
how to display data coming from different tables in access in a form?...the case is this:
3 tables in access:
AddBook(tablename) - ISBN(primary key), Book_Title, Author
Student(tablename) - Student_ID(primary key), Student_Name, Course, Year
Transact(tablename) - Transaction_No(primary key), ISBN(foreign key), Student_ID(foreign), Date_Borrowed
i think you can already picture it out... so what i want is to display data from Transact table and also display the data from Student and AddBook table base on the value of the foreign keys in Transact table....
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Aug 7, 2011
I'm designing a program to display 6 random numbers using labels. I know I'll need an array to accomplish this. I am trying to put the integers into the array and displaying them on 6 different labels
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Oct 27, 2011
In my windows project i have a print preview control . it displays text based on my requirement.my project contains data should be printed in 2 pages.But in my print preview control showing one page at a time.After clicking print preview button again
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Jul 14, 2010
I have a very annoying problem and I'm trying to find the simplest solution possible, but I seem to keep complicating it.
My program displays a custom dialog box using the ShowDialog function (I create this form using a New constructor), but while my program waits for input in the dialogbox, my program continues to run other code, (I'm assuming initiated from other messages, but I still can't find good information on this, so as an aside to this topic does anyone have a reference about this), and arrives at this same point where the dialog box is to be displayed and displays it. So I end up getting a flood of dialog boxes.
My goal is prevent this excessive amount of dialog boxes. If the program arrives at this dialog initiation point I would like it to wait/pause until the first dialog box is finished.
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Aug 5, 2009
Basically I have custom events within several classes which populate data for specific controls. I'm only using one form, however I'm using the TabControl which houses 3 tab pages, I want to display the same label on all 3 tab pages, any idea's how I could accomplish this?
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Apr 26, 2011
I am trying to make a message box display evens from textbox1 (being the user's low input) to textbox2 (being the user's high input). I currently have it displaying the correct numbers for evens, but they are appearing it separate message boxes. I need them all to be displayed in the same message box.i.e. Textbox1 = 1 , Textbox2 = 7 MessageBox = 2 4 6...Also, I have to do the evens in a Do While loop and the odds in a Do Until loop.
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Jun 7, 2010
i want to know is it possible to bind my all crystal reports to a single reportviewer, somewhat in tabbed view or treevie. If tabbed then visible through navigation button.
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Oct 23, 2009
I am using a Crystal Report in my application to display an Invoice. For this, I take the 'Invoice No' as input from the user. I was wondering if I could display multiple invoices on different pages of the report by taking 'From Invoice No' & 'To Invoice No' as input form the user.
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Dec 12, 2010
I am trying to display(in a status strip label) the user name of a user that is currently logged in across multiple forms. The initial form is a log in screen that queries an SQL database for the user name,password,and user type. If the query returns a match,then a different form is displayed based on the user type. How do I retain the user name of the user that is currently logged and display it in the label?
BTW,it's a point of sale program.
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Feb 5, 2012
SELECT
Login.LoginID, Student.[Student Name], Student.[Student address], Student.StudentID
FROM
Login
INNER JOIN
Student ON Login.LoginID = Student.LoginID
WHERE
(Login.username = @user) AND (Login.password = @pass)
RETURN
How do I display the Student Name, Student Address, StudentID, and LoginID into multiple textboxes?
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Dec 9, 2010
I am currently having a headache on how to solve this problem that i am facing.here is the situation:I have a combobox and a list box on the main form. The combobox will get the data from the ms access database.In the database, i have the details of a person's IC, Name and DOB say for eg on one entry I have D215311523C,SHAWN,13/04/1987
So now, my combobox on form load will show the list of dates in the database to allow the user to search base on the date itself by clicking on the selected date. So when the user clicks on the particular date say 13/04/1987, people in the database whose birthday is 13/04/1987 will be shown on the listbox.Meaning to say if i have 3 entries whose dates are the same 13/04/1987, 3 entries will appear. If there is only two entry, then two results will be shown.
[Code]...
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