Refresh Form During Long Synchronous Operation?
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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May 13, 2012
i want to ask about progressbar i mke some looping, maybe long looping, can be 2000 record or maybe 20K record but i want the progressbar show the progress of that looping example = i have 20.000 record, when it loop on the 2.000 record, the progressbar automatically 10%, then if 2.200 then progressbar become 11%.. and the progressbar is dynamically changed within the record i have read some about BackGround worker, but i dont know the concept.so i count the record, and then set the maximum value for progressbar, and inside looping, i set the value 1 by 1 but, if i count it first, then it will 2 time loading and not as fast.
here is my simple code
Function nilaicari(ByVal sDir As String) As Integer
If (countfolder(sDir) = 0) Then
For Each d In Directory.GetFiles(sDir)
z += 1
[code].....
it work fine, but i think it not effective because it process 2 time how can i make it loop, and then immediately make the progress of the looping ?
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Jun 30, 2010
I have written a program that searches a bunch of urls and pulls out information that I need. The program works to an extent. Everything codewise works, but it seems like I did a sloppy job of pulling the code together. After about 10 minutes of running, the program just becomes unresponsive and I have to close it through task manager. I've seen it range from 100k to 350k in memory useage. It also uses about 80%+ cpu usage at all times. I hope someone might be able to see something that I forgot or did wrong as the program is meant to run almost full time, executing parts of code on certain days/times.
Dim con As New SqlClient.SqlConnection
Dim strCon As String = "Data Source=server;Initial Catalog=database;Integrated Security=True"
con.ConnectionString = strCon
[code]....
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Dec 19, 2010
I am running a test program for VB.NET, and it will simply crunch a million numbers in for loop. I've linked a variable implying the progress of the for loop with the progress bar, but it seems that when I run the program, the progress bar does not update itself. The bar itself has only value 0-100 as input (as stated in the document) and I've tested it without using the for loop, and it works.
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Jun 5, 2009
Lets say i label "label1" , and 2 buttons named "button1" and "btnRefresh " [code]So , when user press the button 1 , the text will change. But what should i put inside btnRefresh to reload the forms ? and display the default label.text = "Form Load" ???
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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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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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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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Sep 18, 2011
Is there a easer way of coding in stead of wrighting long long paragraphs like this in one line [code]All of this is on one line and i got lots of info to put down.."The game will begin on your 16th birthday with your mother waking you up. Today you are to go to the castle for the first time. Leave your bed and open your dresser for a Strength Seed. "
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May 31, 2008
I have a parent form that has a combobox. Whn the form loads I get the data from the db and bind to the combobox. that works fine and here is the code I use in form load to cause this to happen: [code] Now if there is not an Account Type, I have a button that will pull up a small form to allow the addition of an account type. The popup form adds the data back to the database just fine, but I am now trying to get the combobox to refresh its data. So I call a public Sub that is located in the parent form to from the popup form to accomplish this task and I have walked the code and the sub is called and appears to work correctly, but the new data never appears in the combobox. Here is my public sub that i call to try and refresh the combobox on the parent form. [code] But when I go back to the parent form, the combobox is not updated with the new account. How can i get the combobox to refresh from the database with the new data?
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Apr 16, 2009
I am working on VB.Net. I have a sub form with a datagridview, that is being loaded with the criteria taken from another form. Hence this form is called with parameters.
Here is the code that calls the sub form.
Code:
where ds is the dataset to fill the datagridview and rb is the string from a radio button on this form.
Here is the code in the sub form.
Code:
Now, I need to refresh this sub form every -- minutes, depending on how the user wants it to be. For this I have given a NumericUpDown control to select the mins. All this works fine. But how do I refresh the dataset and the datagridview?
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Dec 12, 2009
I login webservice then upload files then i download files i do this inside the looping in the processing i have to change the picture box picture the Timer Event fires but the picture does not changes it seems form doestn't refresh
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Jun 12, 2006
I have created a simple VB.NET application with one form and a few modules. When a user clicks on a run button of the form the application starts and goes through differet cycle, while updating the user on status bar, runs for less than four hours.
The application works fine, it gives desired result. However, it is not able to refresh the user form, meaning status bar remains same after some time (it suppose to increment). Even when I take mouse on the form it shows timer symbole instead of default one.
My application commands another device using GPIB. Basically, PC running my application commands the device. If I look the display of device it gives correct information.
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Oct 7, 2011
I have a form, with a datagridview. I can see the data and the related records in the DGV.I have another form that this one calls to add a new record. I need that because there are some specific parameters i need to control. But when the focus returns to the original form, I can't see the new record, even though it is there (I see it in the database).If I close the form and enter again I can see it, that is not what i want.How can I refresh the tables after the other process adds data to them?
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Jun 3, 2010
I'm using Mysql database and Visual Studio 2005. I've got a form with datagridview, After making the changes in the data, it is saved in the database. The data gets saved in the database, but the modified data does not get displayed in the datagridview. Only if I close the form and open it again, the changes are displayed. I want to provide a button (refresh-button), which on clicking will refresh the datagridview, so that the modified data is displayed without closing the form.
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Dec 26, 2009
In Visual Studio 2008 I am using :Private Declare Function BlockInput Lib "user32" (ByVal fBlock As Long) As Long To stop input from occuring during a search-replace operation.
BlockInput(True) ' do not allow input during search and destroy
Dim cursorIcon As Cursor
cursorIcon = Cursor
Cursor.Current = Cursors.WaitCursor
Then setting it to false at the end of the operation. It did not work, so I thought maybe it was because I was calling it from a child window, so I created a function in the mainwindow, and ran it like this:
FrmMain.BlockFrmMainInput()With these functions is the Main window:
[Code]...
It did not solve the problem. I thought maybe it was because I was running under the debugger, so I tried compiling and running it debugger-free, but that did not do any better. I am still getting input when I double-click the mouse on either form.
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Jan 4, 2012
I'm trying to convert code from Delphi to .Net. I'm stuck on one line:
//Delphi code ss := Copy(ss, Length(ss), 1) + Copy(ss, 1,Length(ss) - 1); 'vb.net code ss = ss.Substring(0, ss.Length - 1) + ss.Substring(1, ss.Length - 1)
Delphi combines the two substrings, while .Net just concatenate them like a copy.
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Sep 11, 2009
I m make search file project. In This Project I Search All File From Drive. ( *.* )When i Press Button For Search, Its Still Hand For Few Seconds Or Minutes When Search Completed its Normal. 1. How to Resolve its Hanging. 2. Can I Add Progress-bar For This Action. [Code]
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Dec 15, 2009
how to lock or suspend the form when i call another form and until that is finished this form should be locked.example: i got frmAddEditClient form and frmViewClients as another form, now i got list of clients in frmViewClients and i will select a client i would like to edit the client profile ( for which fuction is defined in frmAddEditClients) so on click of btnEdit in frmViewClients form i place code to [code]now i got everything working fine but i shud make the frmViewClient form to lock so that untill edit operation is done user should not change anything i.e is not selecting other ClientID. in the frmViewClient form.Once edit is done frmViewClient is unlocked and then clientId is refreshed.
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Jan 30, 2012
Been playing around with this and simply can't get it to work
I've got a form and I've created a button called refresh. The button is meant to do exactly that. What happens is that when the form loads, it checks the database for values. If it finds values, it creates a dynamic edit box related to the value.
I open the form and it paints accordingly and as I expect it. If I delete a value from the database then click the refresh button, it should re-draw the form and paint the background grey. The logic definitely works because I trapped the bit of code and it does hit the part where it's meant to set the background grey.
Now, I'm not sure I'm refreshing the form properly because all I'm doing within this sub is calling the form on load event: formLRQuadrantSchedule_Load(Me, New System.EventArgs)
This seems to work logic wise, just not doing what I want. So, I tried this (amongst several other things):
Dim dynTextBox As New TextBox()
Me.Controls.Add(dynTextBox)
With dynTextBox
[Code]....
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Sep 28, 2010
I'm having an application which has to perform exporting and importing data. At the moment he runs those functions, I want a form to popup with an animated gif, so my client sees that the application is still running.But the animated gif stops sometimes, because he is busy doing stuff (like copying files, etc...)Is there a way to tell the form to refresh automatically every 0.1 sec, so the image runs fluidly. I tried to put a timer in my form, and start the timer as from the form is shown...the timer_tick says he has to refresh, but he doesn't want to do that.
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Aug 15, 2011
'Informs you forgot email.
If TextBox1.Text = "" Then MsgBox("Forgot E-Mail")
If TextBox1.Text = "" Then Me.(PLEASE TELL ME WHAT TO PUT!
[code].....
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Aug 8, 2011
I have a datagrid view control that is tied to a dataset. so when the Dataset is updated with a new record,It shows up in the grid. The problem is, I have to minimise the window or some how force a re-paint on that window to see the updated grid.
how to call that refresh? Form.refresh and form.grid.refresh did not work.
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May 12, 2011
how to refresh the windows form in vb.net.
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May 26, 2011
I have an app that opens up 3 forms. 2 forms have a datagrid the other form has book lending details. The datagrid forms are for books in the library and books that have been borrowed.
Both datagrid forms will be open as shown in the attachment, how do I refresh the "Borrowed Books" datagrid form from inside the form that has the "Book in Library" datagrid.
So far I've been able to update the "Books in Library" datagrid because control comes back to that form after the details form closes but since the "Borrowed Books" form is still opened up, we would like to refresh the datagrid on that form.
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Oct 28, 2009
I have a program that has a main form, that stays on all the time.It does not get closed at all, it's the main form for the program. I have this procedure running on loadup of the form.[code]...
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May 12, 2011
in my project one task is there how to refresh the windows form in vb.net window
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Mar 11, 2010
How can i reload/refresh the same form again without losing the data stored along with the form?
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Jan 13, 2010
How do you auto refresh after a form has already been loaded?
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