Removed Number From List Or Not?
Feb 22, 2012
Here is the code I have amended after getting the answer from previous thread (Spinning Numbers)
I'm not sure if I am removing the random number from the list or not as the number shown in the Label(currentnumber) does not match the one showing in Label1, which is the one I'm using to check which number has been removed.
Private Sub Tmr_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Tmr.Tick
'Show spinning numbers for decoration
[Code].....
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May 20, 2011
in what situation will an item in System.Collections.Generic.List not be removed successfully?url...The way they phrase it makes me think that it is possible that a Remove operation on an item found in the List(Of T) could actually fail.
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Sep 15, 2011
We are developing an application that looks like this: Mainwindow - PaneGroup - Pane
What we want to do is add a handler (AddHandler Pane, AddressOf MethodName) on the mainwindow and throw the event in the Pane. When we want something to change on a collection in the mainwindow, we throw that event in the Pane.
My question is if the pane is removed from the panegroup (doesn't exist anymore), does that handler still live on the mainwindow?
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May 30, 2012
I am working on a realtime application where the data is addded to a List(of T) all the time. MB per minute
Elements older than X minutes shall be removed from the beginning of the list to free memory.
As far as i can understand will there be an internal (slow) redim when i add each element after i have reach the number defined with the Capasity metod. (I set that quite big from the start, but the data speed is unpredictable so it can be exceed)
What happens each time i remove and element from the beginning of the list , seems like it takes a lot of time, ? new redim ?
What is the most CPU fficient way of removing 1 or many elements from the beginning of such a list?
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Sep 22, 2011
my form contains a checked list box [data coming from the database] a combo box [bind to a database table product] and a listview [was previously a listbox]
[Code]...
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Mar 24, 2009
I was having trouble debugging an app because I couldn't invoke the Immediate window. I finally ran across a keyboard shortcut to invoke it (Ctl+Alt+I) so my 'immediate' problem is solved, but now I'm trying to figure out why the Immediate window option doesn't appear on my Debug menu like it does on my co-workers? (The menu-designated shortcut, Ctl+G also doesn't work for me.)If necessary I suppose I can customize my menu to add it back in.
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Oct 16, 2009
I am using a dataset class, associated binding source, and a table adapter. There is no binding navigator. Inserts and updates work well. However, though deletions look like they are working as they should, when the form is closed the user is prompted with a message do you wish to save data. Upon doing so the error "this row has been removed from a table and does not have any data. beginedit" is displayed.To delete the record I am simply running the following
code:UserRolesBindingSource.EndEdit()UserRolesBindingSource.RemoveCurrent()The form save routine is simply:Try UserRoleBindingSource.EndEdit taUserRoles1.Update(me.dsARMData.UserRoles)Catch ex as Exception MessageBox.Show(ex.message.tostring)End CatchWhen I did have a bindingNavigator on the form, there were no issues with deleting records and doing subsequent saves.. I understand the binding navigator also calls the RemoveCurrent of the binding source, but what else is it doing to not have the error message display that I don't have?
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Sep 29, 2010
Private Sub cmdReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdReport.Click[code]...
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Apr 21, 2011
[code] I am getting a run time error for this code. How can I change it. and how to limit the loop to print number from 1 to 42 and not 5 in the list ?
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Nov 1, 2011
I have a javascript function that moves items between 2 select multiple box, when I move item from the source select box to the destination select box, I add the value to my HiddenField so that I can access in code behind, works fine but when I move item(s) from the destination select box back to the source select box, I try to use : hidMemType.value = ""; to clear the hiddenfield. I thought this works but apparently in the event of a postback, the item still gets stuck in the destination box.
// Move items to and fro select box
function move(sourceFrom, sourceTo) {
var hidOutlet = document.getElementById('<%=hdnOutlet.ClientID%>');
[Code]....
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Sep 29, 2010
learning about loops (still a beginner) in VB.net. I have got the below code and basically it is meant to stop the loop once it reaches a number above 20. Now, the problem is that it does stop after number 20 but the last number that is displayed in the list is always above 20..... how I can stop it showing the last number as above 20?
[Code]...
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Apr 14, 2009
how to use ListName.Find. I am trying to find a number in an a list of integers.
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May 20, 2012
getting random number from list of numbers is getting me sick. i am trying to do it for like 20 days now but every time i do it ends up in a loop wich crashes the my.settings system. does anyone have an idea how to get a random number from a list. then delete that number so it cannot be called again. my system must mark some items with numbers but non ofthe numbers may be used more then 1 time the max items in my system is 90. so from 1 to 90 without getting 2 times the same number heres the code i tryd
[Code]...
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May 19, 2011
Does anyone know how to add a limit to the number of items in a list box? For example, you can't add more than 10 items in ListBox1.
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Sep 28, 2011
I wanted to see if I could have a list of six check boxes with names of a certain author that people have or have not read. When they are asked to check all that apply to them and then hit submit I want a label to display a message depending on the number of checks they made. So if they have 2 checks marked off then a message could say, "You do not read much of this authors books?" or 5 could say " You like this author, don't you?".
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Feb 26, 2009
I want to list the results in my list box in a numbering format, something like this:
1: Result #1
2: Result #2
3: Result #3
How do you create this type of format in a list box.
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Mar 11, 2012
I have a lot of buttons on a form (144) that need to be removed. All their names begin with "R". So I used this piece of code.
Sub RemoveBookingButtons()
Dim cntrl As Control
[CODE]........................
However whenever I run this sub function, it deletes every other button starting with "R". better code or point out if the flaw is in that piece of code or it is hidden somewhere else in my program?
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Apr 23, 2010
I have been writing a security class in my application, I am able to encrypt the string correctly and without error. However every time when I try to decrypt this string again, i get an error with this as it returns the following Padding is invalid and cannot be removed.
Here is the code:
Public Function DecryptKey(ByVal plainText As SecureString, ByVal key() As Byte, ByVal iv() As Byte) As SecureString
Try
[CODE]...
And it provides a stack trace with:
at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)
[CODE]...
I have found simular issues on web, and most of them say that the IV is not the same the encrypted version, but I can confirm that the IV is the same as they both access the exact same variable.
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Jul 13, 2011
decryption error : Padding is invalid and cannot be removed.
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Mar 13, 2010
I made an app in vb.net express edition after publishing there are many files in published folder, my question is if a user removes any of files in the published folder or replaces it with other files and runs the app the app must show an error is it possible?
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Jun 19, 2012
I'm using a TabStrip control in my VB6 app (mscomctl.ocx).(Annotation: to use the TabStrip control add the component: Microsoft Windows Common Controls 6.0(SP6) )When hightlighting e.g. the 2nd tab ...
TabStrip1.Tabs(2).HighLighted = True
and removing the tab's caption
TabStrip1.Tabs(2).Caption= ""
.. tab2 loses its hightlight !!
To prevent tab losing focus I fixed it with the following code:
For Each e In TabStrip1.Tabs
If e.HighLighted = True Then
e.HighLighted = True
End If
Next
Is it a known bug? Here is my vb6 sample project showing how the tab loses the highlight if the tab's caption is removed.
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Feb 2, 2010
I am writing a program using databases and half way though I decided a column I had was irrelevent and removed it from my database. I have gone into my code on my forms and removed all references and removed it from the data table but I am still getting an ArgumentException in an undefined location. Am I missing somehwere that I need to remove this that was automaticaly generated or something?
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Mar 19, 2012
I am using RijndaelManaged to encrypt just 4 bytes of data which produces a 16 byte result (i am using a 128 block size). When I try to decrypt these 16 bytes I get the message "Padding is invalid and cannot be removed.". (The base stream of the CryptoStream is a MemoryStream based on just these 16 bytes).
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Aug 22, 2011
I'm developing some code to detect new files in a directory and signal it in a new thread through the Created event of FileSystemWatcher. While testing this I noticed that after I removed the eventhandler from the event the thread that was being used was not closed. Why is that? Am I doing something wrong when I'm removing the eventhandler? [code]So first I start off clicking Button 2 to start the event handler. I copy a xml file to the Temp folder and the event will trigger and set the name of the thread. After that I will click Button 1 to remove the event handler. If I then pause the execution the Thread "UpdateSomething" will still be there.
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Nov 14, 2011
I'm trying to figure out a good way of implementing a List(Of) that holds a maximum number of records.
I have a List(Of Int32) - it's being populated every 2 seconds with a new Int32 item.
I want to store only the most current 2000 items.How can I make the list hold a maximum of 2000 items, then when the 2001'th item is attempted to be added, the List drops the 2000'th item (resulting in the current total being 1999).
Thing is, I need to make sure I'm dropping only the oldest item and adding a new item into the List.
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Aug 16, 2011
Here is how Project Euler Problem #76 sounds like:"How many different ways can one hundred be written as a sum of at least two positive integers?"I've struggled to get it right for a couple of days, tried to solve in different ways and got mostly the same results for small numbers (those that are easy to check). I ended up with an algorithm that lists all partitions for a given number in alphabetical order, descending (starting from "N-1 + 1"). Written in VB.NET:
Dim ub As Integer = 6
Dim wayCount As Integer = 0
For n = ub - 1 To 1 Step -1
[code]....
I've studied these links:
(ProjectEuler) Sum Combinations - provides a mathematical solution, which does not list all combinations
Generating the partitions of a number - is in python, which I cannot read/run/understand.
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Jun 2, 2011
EDIT: I am so sorry! I have added my thread to the C# discussion thread instinctively wherein in fact I have been creating my application in VB.NET so sorry! Please transfer my thread to the appropriate location! I am currently trying to mess around with a simple mp3 player and am in the process of creating a shuffle list from all the songs in my playlist.
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Mar 10, 2012
Build a small application that fills a collection (list) with 10 sequential numbers, and then prints the collection(list) in reverse order, skipping every other member, until the entire collection has been displayed. For example, if the collection contained the numbers 1 through 10, they would print as:
10, 8, 6, 4, 2, 9, 7, 5, 3, 1 The print out should be in that order no matter what sequential numbers are in the collection (list). If it were 21 through 30, output would be 30,28,26,24,22,29,27,25,23,21 and so forth.
Note: you must use a collection - do not write down the numbers directly to produce the output. Loops should be employed but the loop control variable should be used as an index or subscript number. Your code should work even if I change the list of sequential numbers to something else. Remember that indexes count from 0 first -- the first item in a collection has index 0, the second item in a collection has index 1, and so forth.
I've got the first part of the problem, getting the numbers in the list box, done with no problem. It's the second part I am struggling with. I cannot get the numbers (I am using 1-10) from the list box to display in reverse order in an adjacent text box.[code]...
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Apr 19, 2009
I'm very new to programming with Visual Studio(just a few weeks). I've read through a beginner's book and I've started to write my first little programs to get used to coding and to improve my skills. One of the first programs I had created was a simple currency converter. I've created a list box and a combo box with a number of different currencies in them and I want to know if there is an easy way to attach a value to each of these selections. For example, if someone selects British Pound in the list box and Indian Rupee in the combo box, I want to be able to have the British Pound be worth 1.67(versus the dollar) and the Rupee to be 25.00(versus the dollar) for example so that I can create a simple function that will change pounds to dollars and then to Rupees so that I can do this calculation with a multitude of currencies. If you have some idea of how I can attack this problem,
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Dec 11, 2009
I am not getting an output with a list, I can only get the last number of the statement in a text box.
Dim lowerLimit, upperLimit, primeNumber As Integer
Dim isPrime As Boolean = False
lowerLimit = CType(TextBox1.Text, Integer)
upperLimit = CType(TextBox2.Text, Integer)
While lowerLimit < upperLimit
[Code] .....
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