Textbox Text Not Updating While For Each Loop Running?
Mar 8, 2012
Windows Forms, VB application... Forgive me in advance for this very elementary question but I am overlooking something really simple here. I would like to have a label show the current value of a variable as the for each loop runs.. I created a very simple Button Click event to figure out where its failing. As it is right now the value does not display until after the for each loop finishes running, which it should actually display the counter value each time it runs through... I know this is possible and really simple because I did it years back but for the life of me cant figure out why I am missing the bar as it should constantly update the label to reflect that?Test Sub is as follows:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim counter As Integer = 0
For x As Integer = 1 To 200000
I need a small app that randomly shuffles a set of preloaded numbers. The shuffling will be visible on the screen and goes on continuously (looping) until a key is pressed and as soon as that happens it will show the winning number.Am using visual basics 2008 to develop the application but my problem is when i start the app and hit a key it will loop through my numbers on the text file and it will also display the event but if i hit a key to stop it will not stop..I was workin on the app but my problem is how to stop the loop and resume on the with a keypress. below is the app codes.
Dim Running As Boolean = False Sub ReadAccounts() Dim arr As New ArrayList arr.Add("1366-665885-666-22650")[code]....
I have a windows form which contains a textbox.I have a loop in my code doing some farly intensive work. In the middle of the loop I want to update my text box.text property on the form to let my users see some simple progress.
It's job is to scroll the textbox (txt_folderactivity) after I update the text box with a new entry. The textbox is multi-line, so this keeps us at the bottom so we can see the new stuff. This sub gets called whenever any of the other subs add a line for things like file rename, deletion, etc. based on file system events (using Public watchFolder as FileSystemWatcher).I had a crossthread issue with just updating the textbox, but I wrote in a Delegate /Invoke for that and it works fine (something I found online earlier this morning), but now I have another issue and I'm not sure how to work it.
I'm getting a crossthread issue with this specific Sub specifically at the SelectionLength, and I'd like to set it up with a Delegate and Invoke and such, but I don't know how specifically. I've searched and read, but I don't get it. Do I need a seperate invoke on each of the 3 lines, or is there an overarching Invoke for the whole bit I'm still new-ish to VB and I don't know how to proceed. I've read some MSDN pages and stuff, but they aren't explaining what the problems is really and what I need to do (or prehaps I'm just not getting it).
I would like to display text in a textbox without having to press enter to show the text. Currently all I am showing is the hostname and ip address of the current computer.
I am trying to understand the do until loop when adding numbers along with a variable to a new line in a textbox, incrementing each time. My current example is very simple but only returns the first value. I require the output to be incremented automatically, so I thought a do until loop would be best.
This is my first post on this forum, so please excuse me if I'm posting wrong. Anyway, I've been having an issue that I've never seen before and is driving me nut, I have a windows form on which I have placed many textboxes that display information from a MS SQL database. The user can then change these values and hit a "save" button which writes the changes to the database. I also have certain textboxes that with the "on leave" event (after a user enters a possible new value) trigger a method that recalculates some of the other fields based on the new information. Hopefully that all makes sense.
So the problem is, when I run through this "recalc" method the first time around, it doesn't update those textboxes that it's supposed to. However, when I put a breakpoint in and debug through it, the debugger shows it putting in the correct values into the textboxes. It's just as soon as the method is done, it puts them back to blank, or whatever they were before
'Rebind stuff here lblCabinets.Text = curMfg.ToString("c") txtCabinets.Text = curMfg.ToString("c")
See asteriks ***below for the problems: There is text in CStr(rdrPlayers("PlayerName")) and the textbox for loop is 15 so why the extra textbox's 6 thru 15 (1 to 15 then 6 - 15 under them 6 is visable others are out of panel display I shortened my code below
I have notice that when a module is running the screen does not update properly.For example if I change a label to read "Please Wait..." The second half of the label does not display until the program is idle.Can I get the screen to update while its running.
I am trying to make a for loop in which a picturebox is suppose to go up and then down. The problem I am having is that the picturebox is not animated; i.e, it does not update the image rather the image stays the same as from the start.
I am using timers to animate the picturebox and I have done something similar to:
For count = 1 to 8Select Case countCase 1tmrJump1.Enabled = TrueCase 2tmrJump2.Enabled = TrueAnd so forthEnd SelectNext
In my winform application, I have 2 datatables, both contains 37000 rows. Table 1 has 171 columns and Table 2 has 4 columns. A While loop runs to update values in Table 1 from Table 2 for 4 columns. A For loop runs inside While twice to update values. It takes more than 5 min to do so. which i think should be a task of 5 seconds.
I am working on trying to update a list of items to an Excel spreadsheet. I have created my own custom class called Songs and a List(Of Songs) that I want to update the spreadsheet with. It seems like everything is working -- I have even put in a debug msgbox that displays what Song it is currently on while iterating thru the loop -- but after the code iscomplete, I check the spreadsheet and only the first song in the list gets updated. I'm thinking it must have something to do with either the connection string or the parameters that prevents it from updating any other song records. BTW, there is no errors being tossed so it ats like it everything is being processed, just that the data doesn't change for the update inside the loop. Here is the section of
Private Sub btnProcessList_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnProcessList.Click Dim adoConn As New Ole.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;data source='" & _
i have a screen capture running just as a picturebox on a winform updating with a timer... i have it so it shows my race in a game.... now all is running gr8 on my pc... im now looking to make it viewable to someone else thats connected to my chat server i have made a picturebox on the client form and have the capture code in my server im hosting on my pc...
so my question is how and what is the best/quickest way to do so? maybe memorystream? if so how do i go about that? how do i send a image over memory stream? or is there a better way?
The problem I'm facing is that the update happens correctly only for the first of many values. All the other values are calculated and consequently, updated incorrectly in my table. I am almost certain that the looping is what is causing the problem but have been unable to find a way around it.
If I'm running a Do... Until or a For... Next loop in a button click event, is there a way I can allow the user to click the same button while the loop is running and escape the loop?
I am writing a program that is connected to an rs232 port and I need it to constantly be monitoring the incoming data. I think there are a few ways of doing this like checking the buffer but I need this to be running while I am connected to the port. I have a play button and a pause button for the port. When the play button is pressed, the port is open and the button is no longer enabled until the pause button is pressed. I need to have a while loop running the entire time the play button is no enabled, or pressed. I am having a hard time knowing where to implement it in the code.
I'm developing a interface in VB.net which will control two stepper motors. Counting on your tips I managed to control them manually I mean, there're 4 buttons used to move the motors clockwise and anti-clockwise. The point is, the main part of our project is control the motors automatically. Our idea is based on two editable fields, X and Y, where the user would insert the displacement value he'd like the motor to move. After filling up both fields, the "GO" buttons would be pressed. So the loop would run depending on the displacement values in X and Y.
Attached you can find the main screen:
Below you can find the main code.
Public Class Form3 Dim velocidade As Double = 0.004 Dim X As Integer = 0
1. load gridview from an uploaded excel file (this would probably be about 300 records or so)
2. compare manufacturer, model and serial No to my MS SQL database (about 20K records) to see if there is a match.[code]is there a better way to find a match between the two?
Basically what I have are two loops, one inside the other, that will run until the given condition is met. Exactly what I want. My problem is that I want to be able to use the controls, like buttons, while a loop is going on.
I originally did not think of this until I had built this part of my program, what I want to know is if there is a way to use controls while a loop is going on or if their is an alternative.
1)I know timers can be used to meet these goals, but they did not work out as I had hoped and using two timers (1 to represent each loop) I do not believe is efficient.
2)I have considered using recursion, but have found this may not be very efficient either and am not quite sure if this will do what I want.
These loops run as long as the number the user inputted. So it could theoretically run for 100,000+ times. I am not looking for speed, but it would be good if there were a faster method that allowed me to use controls while it loops.
I am a new member that has just start coding. Im currently working on a small application for a desktop that will give me information from my system. I have code that works but might not be great. I have code that checks that the network is connected but need it to keep checking and updating. I Have tryed loops, goto and timers but not having any luck. Can anyone help point me in right direction. Here is my code so far.
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Label1.Text = TimeOfDay Label8.Text = "Time :"
I've been having a bit of a problem using the while function.
Here is my code (Simplified): Dim RandomNumber3 As Random Dim RandomOutput3 As Integer
[CODE]..............
When running the debug, the program crashes, and when I step into the program, I find that this While statement becomes an infinite loop. This is a program that uses random number generators to assign a value to something, and this while statement is necessary so that there is never two of the same values showing (RandomOutput, RandomOutput2 & RandomOutput) Have to be different to one another.
I am currently teaching myself the caveman code of Visual Basic (VB.net). Apparently I fail at If-statements or something, because I cannot get this to work...
When it comes to threading. I've managed to adapt one of JMcIllhinney's backgroundworker codebank examples to somewhat suit my needs, but not completely. I have a main form, and a second form that appears while I'm running through a for loop. It informs the user what is currently happening. I set up a backgroundworker that allowed me to continue to use the main form during the for loop, but the other "status" form was completely frozen, and any labels or graphics were shown as white boxes. I am struggling to figure out how to be able to move/interact with both forms while the loop is running.
I'd like to make a simple program where my form consists of a textbox and a button. Here's the ide in a nutshell:in form1_load I invoke the sub:
private Sub LoopingLesson() dim i as integer=1 while true
[code]....
what I want is when i hits certain value, like let's just say i is divisible by 365, then the 'while' looping will stop, and a message box saying "target reached" appear. then after I click button1, the looping will resume until it reaches the next number divisible by 365, and so on.
