For Each Loop Error On Next?
Jun 7, 2010test
For Each p As Principal In objGroupPrincipal.Members
lstUsers.Items.Add(p.Name)
[code].....
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Evaluates Loop Condition In Do...Loop Statment To Determine Whether Loop Instructions Should Be Processed
Mar 14, 2011Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
Syntax Error For Loop
Apr 8, 2010VB.Net 2002 - Framework 1.0..I have below code and getting syntax error in For Loop at "To" [code]Error is at To in For loop.
View 3 RepliesWhile Loop With Dates - Getting An Error
Nov 15, 2009I am trying to do a while loop with dates but I an getting an error:
Here is my loop:
Here is my error:System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
Error Loop Through The Rows Of A Particular DataTable
Nov 17, 2011i want to read table row by row i have table with two columns but i want to read the first column only row by row her's my code
Dim col As String = "SELECT users.user1,users.valueid FROM users"
Dim cmd As New OleDbDataAdapter(col, CON)
Dim ds As New DataSet
[Code].....
Getting An Error With A For....Each Loop For A Collection Class?
Sep 1, 2010I decided to go back to the VB6 book, "Learn to Program Visual Basic Objects", so I can code it in VB2010. This has been a great learning experience. However I've run into a problem. I'm getting an error with a For....Each loop for a collection class. The error message states, Expression is of type 'China.Order', which is not a collection type." From what I've deduced the problem deals with an enumerator. I could be wrong.
View 2 RepliesHow Should Continue For Loop Disregarding Error
Jun 8, 2011i have the following code for getting the number of files on a drive:[code]I want to skip the files which i dont have access to. But my error is occuring before the try hence i am not able to continue the loop.Please advice on how should i continue the for loop disregarding the error.
View 7 RepliesListBox Error Infinite Loop With Try
Nov 29, 2008Code:
p = -1
Try
ListBox3.SelectedIndex = p
Catch ex As Exception
ListBox3.SelectedIndex = -1
p = ListBox3.SelectedIndex
End Try
Just cycles through my listbox without exiting the try. It keeps having an error causing the catch again.
Run Time Error During Long Loop?
Dec 7, 2011I wrote a program which loops through a very long CSV file (50 meg) and parses the data as it goes.Sometimes, the program aborts and I get the following message:The CLR has been unable to transition from COM context 0x37a090 to COM context 0x37a200 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.
I know its going to take a while. There are several hundred thousand lines of text in the file that this program is reading. I am not sure exacly waht the message means, but my program seems to work fine other than the message. odd thing is sometimes the message doesnt always pop up..
Small Error With If Loop And Msgbox
Aug 12, 2010Small error with if loop and msgbox
View 8 RepliesVS 02/03 - Framework 1.0 - Syntax Error For Loop?
Apr 8, 2010I have below code and getting syntax error in For Loop at "To"[code].....Error is at To in For loop.
View 1 RepliesMultiple Referers One At A Time Loop Error ?
Jan 21, 2012Here is the code:
CODE:
What I want to do is I want to post to different referers one at a time and of course the links will be provided by a richtextbox(i.e. richtextbox1.lines(i) ). I will use only password(which will be chosen by the user from a combobox(combobox1.text)) because the username is harcoded. This is what so far ive come up with but it always gives me the result of the first line(or referer) from richtextbox1. I think there might be a problem with my "FOR" code.
CODE:
VS 2010 For Loop Inside Backgroundworker Gives Thread Error?
Jul 5, 2011I have a backgroundworker that is downloading data from different webpages and process them to a datagridview.I get the Cross-thread operation not valid error on the first For loop.
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
dim i as integer
tot = (numPostnrTo.Value - numPostnrFrom.Value) / 10
[code]....
For Each Loop Error: Collection Was Modified; Enumeration Operation Might Not Execute
Oct 15, 2011I am encountering an error when looping through datarows. I searched SO and tried the solutions, but no luck. Collection was modified; enumeration operation might not execute.
Dim dRow As DataRow
For Each dRow In dt.Rows
dt.Rows.Add(dRow("CustNum"), dRow("SalesRepName"), dRow("mgrid"), "=""" & dRow("midValue") & """", dRow("dba"), dRow("sysDate"), dRow("statusID"))
Next
The error occurs the first time the code hits "Next". What would be causing Collection was modified; enumeration operation might not execute.How can I resolve this error?
VS 2005 Error When Loop Exceed To The Files Inside Folder
Apr 22, 2009i got error when
1.) Looping exceed the images files found in the folder
2.) When program get not valid file
3.) when changing the source of images
the error says "Parameter is not valid"
here is the code below....
Function getnewImage()
Try
If (Me.Ping.Send("pc1", 6000).Status) = Net.NetworkInformation.IPStatus.Success Then
[Code].....
VS 2010 Unexpected Error On Program Close With A Wait Loop?
Dec 1, 2011In my MDI Application code I have a form that launches a second form then hides itself until the spawned form closes. It works great unless I choose to close the application while the spawned form is still up.
The following is some example code.
Dim ChildForm as New frmTaskWindow With { .MDIParent = Me, .AddingNew = True }
ChildForm.Show
Me.Hide()
[Code].....
Me.Show() ' error occurs here because my form is already closed by the system. Is there a way to get around this without just an error catcher?
Directoryservices.directorysearcher Loop Has Error A Column Named 'cn' Already Belongs To This Datatable?
Oct 4, 2010I have a function that searches AD for members of various groups. If I remove the loop, I don't get the error "A column named 'cn' already belongs to this datatable", however, I need to iterate through each OU.
Function getCOMDLNames(ByVal searchStr As String) As DataTable
Dim MySearchRoot As DirectoryEntry = New DirectoryEntry("path", "usr", "pwd")
Dim MyDirectorySearcher As New DirectorySearcher(MySearchRoot)
[code].....
Variable Declared Inside A For Loop - Make This To A Compile Time Error?
Mar 27, 2012Today I investigated a logical bug in our software and figured out that this is related to the way VB.NET thread variables inside a loop.Let's say I have the following code:
Dim numbers As New List(Of Integer) From {1, 2, 3, 4, 5}
For Each number As Integer In numbers
Dim isEven As Boolean
[code]....
The problem is that isEven is declared but not assigned.In this specific case, it would be correct to write dim isEven as Boolean = false but I haven't done this.In VB.NET, a variable that is declared inside a for loop keeps its value for the next itaration. This is by design: [URL]but this is also dangerous pitfall for programmers.
However, until now, I haven't been aware of this problem/behaviour. Until now.Most of our code base is C# anyway, which doesn't allow the use of an uninitialized variable, so there is no problem. But we have some legacy code that is written in VB.NET that we have to support. So the best thing would be to generate a warning or even an error in this specific case.But even with Option Explicit / Option Strict this does not generate a warning / an error.Is there a way make this a compile time error or maybe a way to check this with FxCop?
Why JIT Debugger Control Transfers Error To Program When Run In Debug Mode And Goes On In Infinited Loop
Jan 27, 2010I cant figure why the VB JIT Debugger control transfers the error to the program when I run in Debug mode and goes on in an infinited loop... I am using VB.NET 2008 and MS Access as the database backend.What I am trying to do here is that whenever I catch an exception (I have some C# code dll added to this main program and it should catch the unhandled exception and the addhandler routine will follow suit. So the moment any unhandled exception is caught MyHandler method is invoked and I need to take the backup of the database (Delete if the original file exists, copy the *.bak file as the original file name(was created during new file development) ,name it as *.mdb ) show a customized messagebox warning the user to abort (custom crash dialog instead of the standard default one)Somehow Myhandler goes in an infinite loop stop at line Globals.startBackup inside Private Sub MyHandler..Any idea on this weird AppDomain.Unhandled exception and how to prevent this from happening? [code]
View 1 RepliesGet The Error "Null Reference Exception Was Unhandled" Before The Loop Ends?
Aug 1, 2011I tried adding a loop inside this loop but continue to get the error "Null reference exception was unhandled" before the loop ends.
For rowIndex = 0 To dgvVisit.RowCount - 2
MessageBox.Show(dgvVisit.Rows(rowIndex).Cells("CoPayCharge").Value.ToString)
For rowIndex1 = 0 To dgvPayment.RowCount - 2
MessageBox.Show(dgvPayment.Rows(rowIndex).Cells("CoPayPaid").Value.ToString)
Next
Next
Countdown During Loop - Label To Show How Many Cycles In Loop Are Left
Mar 9, 2011I know I am missing the obvious. I would like a label to show how many cycles in loop are left.
[Code]...
Make Loop In Program And Calculate Time Taken To Complete Loop?
Nov 23, 2011I am constructing a program, i am new to Visual Basic, but i have past programming experience. I was wondering if anyone knew how to form a loop that could...lets say calculate the answer when two numbers are added together,and it would repeat this thousands of times, etc. And if there is a way, would it be possible to calculate the time taken to complete this loop.
View 5 RepliesGetting Loop Through Adding Each Result Without A MessageBox Stop In Each Loop?
May 3, 2010I have written a function that gets the alexa ranking of a given url, now this function works perfectly but I want to loop through a ListView of urls and grab the alexa rank of each item (url) with my function.The code works great if I put a MessageBox in the loop to test that the function is returning a value but when I remove the MessageBox the loop does not work.I need it to loop through adding each result without a MessageBox stop in each loop.
vb
For Each Item In ListView1.Items
Dim result As Integer
result = GetAlexaRank(Item.Text)
[code].....
For-Each Loop Error "InvalidOperationException"
Jan 20, 2011Came across an issue when writing some code to load my app's settings-- the following code produces an InvalidOperationException error:
[Code]...
The debugger highlights the Next part, and from the MSDN page on the error, it looks like this is because the collection (CurrentMaps) has somehow changed from when it last bumped the enumerator (to process the For Each). Not sure why that would happen, though, as AddMap takes the MapInfo ByVal and doesn't touch the input (so the collection is not changed). I changed it to this, which works perfectly fine:
[Code]...
Create A Loop To Loop The Locations Of The Platform?
May 31, 2010So I made a simple patform game where the player has to jump quickly while the platforms move to the bottom of the screen, as to not touch the bottom of the screen. But, I need to know how to create a loop to loop the locations of the platform. This means that after twenty or so platforms, the same platforms come up again, so that the player will have an "endless" game. I've declared all the platform's locations relative to the location of the first repeating platform:
[Code]...
VS 2008 Program Works Before Loop But Not After Loop
Aug 11, 2009I assigned an integer as 1, and looped my program using:[code]I can recieve the packets without looping, but once i loop, i receive nothing.
View 29 RepliesStart Button Loop A BackgroundWorker With Sleep OracleConnection Results After Each Loop Till Stop Button
May 29, 2012I have this little application that runs a SQL query works great, now I want to have a Start Button run the and display results then System.Threading.Thread.Sleep(300 * 1000) for 5 min then run again and display results and loop till I buttonstop_click. unsure if the sleep is the best method.
[Code]...
For Loop And Last Value From The Loop Is Displayed In The Label
Sep 10, 2009I am new to VB programming. I have the following code. When I execute my program only the last value from the loop is displayed in the label. I do write my code so that all of the values (years 1 to 5) show up in the label?
[Code]...
BackGroundWorker And Loop In A Loop?
May 9, 2011I'm completely new to working with more than one thread at a time but I've been reading up on backgroundworker quite a bit today. I get the general idea and think I could use it ok if it weren't for the fact I have a loop in a loop and I don't think they could be run inside a single thread together
View 4 RepliesConvert A Loop To A For Loop?
Nov 18, 2009How do you convert a loop to a for loop
View 5 Replies