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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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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'in form class
Dim PIC_PATH As String
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[code].....

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

[code].....

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Module Dic_Select
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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
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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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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

[Code].....

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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

[Code]...

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I have two structures Public Structure myResearchData

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

[Code]...

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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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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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

TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
TextBox4.Clear()
TextBox5.Clear()
End Sub

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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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Jun 23, 2011

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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

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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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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

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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

[CODE]......................

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

Feb 1, 2009

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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

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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

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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 Microsoft.com, 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

[code]....

All the security updates and hotfixes for Widows XP.

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Public Function AddUserToGroup(ByVal sSamAccountName As String, ByVal sGroupName As String) As Boolean
Try
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Feb 9, 2011

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

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[Code]...

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

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txtbox1.Clear()

or

txtbox1.Text = ""

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Jul 15, 2009

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Feb 28, 2011

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'...

[Code].....

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

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[Code]...

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CODE:

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Dim
RTF As
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[code]....

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Mar 5, 2012

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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

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Public Class Coach
Public Sub Main()
Dim coach As ArrayList = New ArrayList
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[CODE]...

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Oct 11, 2011

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Dim QueueObj As New Object

[Code]....

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If .SQLDS.Tables(.sSQLDSTbl).Rows.Count > 0 Then
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[Code].....

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[Code]...

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Dim list1 as New List(Of Object)
Dim list2 as New List(Of Object)
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[Code]....

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aa/bb
aa/bb/cc
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[code].....

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