Clear ArrayList From Memory

May 11, 2009

[code]I tried to fill the arraylist and then clearing it, when I clicked btnFillMem, the memory increased from 607 MB to 633 MB, but when I clicked btnClearMem, the memory didn't decrease and still around 633 MB. Do you know how to clear arraylist from memory? Or in other word, do you know how to release memory usage from an arraylist?


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how do i clear all elements in an arraylist?

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I am using excel to store and retrieve information. I open the excel work book then close it once the action is completed. I thought it was clearing fine till i opened my Task Manager and found a ton of instances in the Task Manager. I can clear them manually but my users are not going to do that and it is cheesy to have them have to do that. I have researched this and some folks were talking about a "Marshal" method. I researched that and don't understand what it does.[code]...

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Apr 17, 2009

'in form class
Dim PIC_PATH As String
Dim PICTURE As Image


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I am having issues with initializing more than one process without having to close the program and re launch to run a second process. I need to clear the process impersonator out of the memory or something in order to start a new one?

Imports System
Imports System.Runtime.InteropServices
Imports System.Security.Principal
Imports System.Security.Permissions


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How To Clear All Memory Used For Item As Array

Jul 25, 2011

Module Dic_Select
Public DicDataSelect() As DicDataList
Public Selected_Dictionary_Name As New ArrayList
Public Function New_Dictionary(ByVal Dic_Name As String) As Boolean
For i As Integer = 0 To Selected_Dictionary_Name.Count - 1 Step +1
[Code] .....

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Clear List Of String To Release Memory

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Is it necessary to clear a List of String to release memory?Or is it done automatically?

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Mar 26, 2010

I am writing a code that downloads alot of information from different servers. Puts the information in an excel spreadsheet, saves the sheet, and uploads it to an FTP page for each server. The code is running into an OutOfMemoryException. Is there a way to clear the memory after each servers file is uploaded to the FTP?Or is there another way to fix the problem with out adding memory to the server the code is running on?

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Copy The List Of Principal User To Arraylist To Use Arraylist.indexof?

Dec 1, 2011

What I am doing is iterating through all the groups that belong to the top group (Generic reports). Then I take advantage of the GroupPrincipal.GetMembers(True) which will recurse through a given group name. I test to see if the user exits under that group and if true I put the group name in an arraylist.

I use the for each principal in GroupPrincipal.GetMembers to loop through each returned user to see if they exist.

Is there a way to put all the returned users Principal.Name from a given group in GroupPrincipal.GetMembers into an ArrayList? This would allow me to to use Arraylist1.IndexOf to search for user. Which would be much faster then iterating through a returned list using the for each construct.

Sub RetAllMbrs(strUser As String)
Dim oPC As PrincipalContext = GetPrincipalContext() '<- this is function somewhere else in the code


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I have a problem in Treading.I have a code like this;[code].....

I want to change ListBox1 with ArrayList. But I couldn't find how to use adding a string to ArrayList in tread.

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Question If ArrayList Contains String Remove It From New ArrayList

May 6, 2010

I have an arraylist (arrFirstArry) which I use to populate another arraylist (arrNoDuplicates) preventing any duplicates from being added. This works fine. What I would also like my code to do is prevent adding any partial values which may exist from being added. i.e. my array is like this


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Struct - .net 2003 Arraylist Of Structure Which Have An Arraylist?

Sep 22, 2011

I have two structures Public Structure myResearchData

Public batchName As String
Public arraylistRData As ArrayList
End Structure
Public Structure myResearchSubData
Public researchDescription As String


Cleared MyResearchData.arraylistRData for new data to be put in but it also clears the arraylist inside MyResearchDataAList and didn't old the contents of the arraylist

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VS 2008 - Reading ArrayList In My.Settings And Add Another ArrayList To It

Sep 21, 2010

What I need to do is read an ArrayList in My.Settings and add another ArrayList to it. The first think I'm trying to do is load My.Settings.Records into myArrayList. I'm not quite sure on the proper way to do this. I've tried things such as Dim myArrayList As ArrayList = My.Settings.Records, I'm not sure if I need New and I'm not sure if I need .Clone or .CopyTo.

Then I have another ArrayList myArrayList2. To get this into myArrayList I've done: [Code] Then to save it back to My.Settings I've done. My.Settings.Records = myArrayList. The problem is I keep on getting Object reference not set to an instance of an object error on the AddRange line. My.Settings.Records is definitely an ArrayList and it will sometimes = Nothing. The objects will only ever be strings.

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Create A CLEAR BUTTON Loop To Clear All Textboxes?

Dec 13, 2011

this is currently my code to clear my 5 textboxes

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click

End Sub

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Clear Dataset But Get Error Sometimes If It Is Empty When Try To Clear It?

May 17, 2009

I have a timer that runs every time by itself, and for the code the runs in it I would like to have it clear the dataset before it does anything, the timer runs every 10 seconds, so I tried to do dataset.clear but it would crash if the dataset had no values

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Clear Hyperterminal - When Press "ctrl+L" Is To Clear Terminal Screen How To Write The Code?

Jun 23, 2011

in hyper teriminal when i press "ctrl+L" is to clear terminal screen how to write the code in Hyperterminal is connecting to serial comport.when i try this it work and return line on debug

serialport.writeline ("at+cmgl=1")

i try this but not work and it still show some lines on debug

serialport.writeline (vbcrtl +"L")
serialport.WriteLine("vbCrLf + l")

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Create An Array Of An Array (or Arraylist Of An Arraylist) To Hold Strings?

Mar 20, 2012

I want to create an array of an array (or arraylist of an arraylist) to hold strings.I want to fill an array1 with string values Then add this array to array2. - but only taking up 1 row in array2 e.g something like array2(index)=array1 Then clear array1 then loop through this again with different data, and add it to the will end up with something like

array2(0)... contains a collection of array1 data
array2(1)... contains a collection of different array1 data
.. and so on

i think i need to make new instances of array1 each loop, but not sure.I dont mind if it uses arrays, or arraylists, or lists, or structure of arrayslists?

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Nov 5, 2009

In VB 2005, I am calling a C++ DLL function that returns the address in memory and size in bytes of a jpeg image. How can I load that jpeg image directly from memory into a picture box in my VB form? I cannot afford to save it to disk first.

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May 22, 2007

Im getting a problem with one of my programs I have made in visual basic.NET where it gives me a memory error when i debug the program in the IDE. the exact error is this: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". My program basically has a few forms with text fields on that get their text values from an access database on the same hard drive. Im wondering if im doing something wrong because my program just seems to eat up memory whenever it does anything. For example I have one form that has a combobox on it and when you change the drop down list selection it retreives a few strings from the database and puts them into the relevant text boxes, if you keep changing the selection then the memory usage (in task manager) just keeps going up and up. occasionally I get the error mentioned above when debugging but in my built version of the program it throws an exception everytime the memory usage gets past 49K.

Also I noticed when debugging in the "immediate window" frame I get the following message often:A first chance exception of type 'System. Invalid OperationException' occurred in System.Data.dll...Do I need to somehow be "releasing" the memory that is used to gather data once it becomes redundant?

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Attempted To Read Or Write Protected Memory. This Is Often An Indication That Other Memory Is Corrupt

Nov 24, 2011

I am using the following code

This error occurs :

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Public Class FormRegEnumValue


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Attempted To Read Or Write Protected Memory. This Is Often An Indication That Other Memory Is Corrupt?

Feb 1, 2009

QuoteSystem.AccessViolationException was unhandled Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Source="System.Windows.Forms"

Im designing a web browser and i continue to receive this error after going to about 3 websites it crashes with that error.

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Jan 20, 2010

I have a BackgroundWorker object that I instantiated to perform a DB process on a background thread ansynchronously. I have event handlers for DoWork and RunWorkerCompleted. I can tell that the BackgroundWorker is disposing of itself because I added a message box into the Disposed event handler.Is it necessary to detach the event handlers to ensure that the memory is cleaned up and that there are not memory leaks?

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Thread And Memory Leaks - Memory Usage Jumps About 1000k And It Never Goes Back Down

Apr 17, 2011

I've noticed that every time I start a new thread in my program, the memory usage jumps about 1000k and it never goes back down. I have ensured that the thread is no longer running, and only one instance of my worker thread is ever running at a time. I am using ThreadPool.QueueUserWorkItem and ASyncOperation to get stuff done. The program starts using a Sub Main in a module that uses STAThread; I read that using STAThread instead of MTAThread makes it impossible for the Garbage Collector to get in and consider objects for garbage collection. However, when I change the STAThread to an MTAThread, the WebBrowser control in my frmMain cannot be instantiated.

I get this exception:

Code: An unhandled exception of type 'System.Threading.ThreadStateException' occurred in System.Windows.Forms.dll

Additional information: ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment. I do threading with the WebBrowser control, so will using MTAThread fix my problem? If so, how should I partition my code so that the WebBrowser control won't be affected by the above exception? I call the thread repeatedly with a timer (although only one instance ever runs at a time), and my program's memory usage starts at about 5000k and can jump to 300,000k+ depending on many times the thread needs to be called.

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2008 Express Edition: Attempted To Read Or Write Protected Memory, This Is Often An Indication That Other Memory Is Corrupt?

May 27, 2009

I cannot use Visual Basic 2008 at all.  When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.

I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1;  then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.

Here is the programs I have  installed:

Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2


All the security updates and hotfixes for Widows XP.

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Jan 11, 2012

The follow code can be called about 6K times on the server it is run on then gets a out of memory error in the last catch statement. I don't see what is wrong with the code, it works well up until the out of memory..

Public Function AddUserToGroup(ByVal sSamAccountName As String, ByVal sGroupName As String) As Boolean
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Read Or Write Protected Memory Often An Indication That Other Memory Is Corrupt?

Feb 9, 2011

I have two forms, Form1 and Form2. Form2 has a button to show OpenFileDialog. I call Form2 from Form1 by a button. My startUp Form is Form1. When i start debugging, i press my Form1's button to show my Form2, it shows, but when i click On Form2's Button to show OpenFileDialog it is giving me exception that

"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

When i set my startup Form to Form2 and click Form2's Button to show OpenFileDialog then it shows!

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Difference Between ArrayList In VB From ArrayList In C#?

Apr 12, 2012

s there a difference  between the arraylist in visual basic and arraylist in C#? I had to convert some C# code to VB and there is a call I make in a third party api that requires me to pass in an arraylist.  When I do this in C# it works just fine, but when I do this in VB, I just get back a vaque exception from the api.


The exception I get is very vague and comes from the API.  All i get is, "ARException Occured".

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.net - Clear() Or Txtbox.Text = "" Textbox Clear Methods

Sep 20, 2010

way to clear textboxes in VB.Net and what is the difference between the two methods? I have also seen people be critical of folk using clear objects on their forms and i can see why but in this case, i am only learning.



txtbox1.Text = ""

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Clear All The Data In Data Grid View Without Clear The Binding Source?

Jul 15, 2009

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Why Did Clear() Clear Both DataTables

Feb 28, 2011

In my winform program (in I wrote:

Dim dt As New DataTable
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But when I run the program, Clear() cleared both dt and dttemp! Why? Aren't dt and dttemp supposed to be two distinct instances of DataTable?

(I finally found a solution - dttemp = dt.Copy() instead of dttemp = dt. But I still can't see why Copy() was necessary in this case.

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Aug 3, 2010

I have a new problem with this same Form Printing project and I get exactly the same exception but from the different point of code:

line 538:       d.PrintFunction(c, typePrint, mp, x, y, extendedHeight, ScanForChildControls)

The exception type is System.AccessViolationException and it says (after I translate it from my own language in which the message is given in my pc, into English):"Protected memory was tried to be read or written. This often indicates that the other memory is damaged"

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Mar 26, 2010

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Aug 4, 2010

I am getting the following error: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". i am using interop service.

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Feb 9, 2011

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Dec 11, 2011

I am using VB.NET 2010 and accessing a DLL that was created in VB6.I added the DLL in the References, and in the program I do the following:



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Best Way To Use Arraylist Of Arraylist ?

Mar 5, 2012

I am trying to make a little program for fun and I don't know OOP that well. Since this part of the program is going to be large in comparison to everything else, I want to make sure I don't half ass it.

I need,
50 states
each state having multiple schools
each school having multiple players
and each school having 1-4 coaches who may or may not have awards

I only posted a couple classes since I should be able to figure the rest out off of these two. The award class properties will be changed later. How do I make a new coach that has x awards? I am confused with this part. If I did not explain something clearly please let me know, I want to make sure I get this program started off the right way.

Public Class Coach
Public Sub Main()
Dim coach As ArrayList = New ArrayList
' coach.Add(New Coach(1, "Billy", "Bob", 0, 50, ???))
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Oct 11, 2011

I'm having some trouble adding an object to an arraylist.

Basically the object has two properties (file id/name), but I can't figure out how to assign those properties. During runtime it errors out with public member on the object not found.

Private QueueList As New ArrayList
Public Sub Queue(ByVal FileName As String, ByVal FileID As Integer)
Dim QueueObj As New Object


I'd also like to know how I can do a loop on the arraylist and access the two properites on each record.

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Nov 19, 2011

I am trying to create an arrayList of people. The variables, or arrays are; first name, last name, age, DOB. I am wanting to load all that into one arrayList and dataBind it so it would look like [code] Loading it into an ASP DataList. SO Fname + Lname + age + DOB are loaded on the same line/index. Not sure how to go about this. I'm sure it's an index issue..but not sure the thought process to even begin to load these elements into the "0" element, then the "1" and so on. Not puling the information from a database, just preset arrays/arrayList. ANY suggestions? ( I have it so it is dataBound to one arrayList entry as in [code] This works fine. But if I wanted to add the last name to the first name on the same line...that's were I am not seeing the connection.

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Sep 5, 2011

I have an 2-d arraylist with 2 fixed columns and dynamic rows. The arraylist will be assigned to the session variable at the end of the code below. My question is how can loop thorugh the arraylist from the session to get its value?

If .SQLDS.Tables(.sSQLDSTbl).Rows.Count > 0 Then
Dim NoOfAdjType(1, .SQLDS.Tables(.sSQLDSTbl).Rows.Count - 1)
For iRow As Integer = 0 To .SQLDS.Tables(.sSQLDSTbl).Rows.Count - 1


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Jul 1, 2009

Not quite sure how to attack this one. If I have an array list how would I go about elminating duplicates but adding the values of those items together. In other words if I have one item that has a id of 9000 and a quantity of 5 and another item that has the same id of 9000 and a quantity of 10. How would I eliminate the duplicate but add the quantities

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