Out of pure curiosity, is there a way to free the memory used by a StringBuilder, other than the obvious MyBuilder = New StringBuilder and MyBuilder.Remove(0, Length) (although I guess the later wouldn't free anything, would it?)
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I looked at the Dispose() method in System.Data.SqlClient.SqlTransaction (using a decompiler):
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Why does everyone say in forums that it is Rolling back in the dispose? Where does it rollback?
Ho to use xxx.DISPOSE() under VB.net
View 4 RepliesI have a program, and there is a timer to run it every 15 minutes. Every time it run, it will create a new exe / thread, (I monitor this thru an external software called TCPView). With the thread growing, it may slow down the performance, is there a way to dispose the thread before a new one is created?
Private Sub Processing()
Dim tmrThreadingTimer As Threading.Timer
Try
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I am having fun working with System.Threading.Tasks. Many of the code samples I see, however, look something like so:
Dim lcTask = Task.Factory.StartNew(Sub() DoSomeWork())
Dim lcTaskLong = Task.Factory.StartNew(Sub() DoSomeWork(), TaskCreationOptions.LongRunning)
Task.WaitAll(lcTask, lcTaskLong)
That's the extent of the sample.Tasks implement IDisposable, so obviously I'm supposed to dispose of them, but what if I just want to "Fire and Forget"?If I don't dispose, will I leak threads/handles/memory/karma?Am I using tasks "wrong"? (Should just use a delegate and leave tasks alone?)
Can I dispose in a "ContinueWith()"? (That seems like playing Russian Roulette.)[URL]..
When is it appropriate to apply the dispose method to controls?For example in a form that has five group boxes, once the first group box is used to gather user entries and is no longer needed, is it worth it to apply the dispose method to the first group box? Is it needed for local variables, for example a StringBuilder used within a private function which is only used while the function is executing?
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Here I am Clear the object using Dispose( Mycmd.Dispose()). Can I Use here Nothing ( Mycmd = Nothing?. Which is the Best ?
I attempting to dispose / close a startup form from a sub. Basically, I using the filesystemwatcher to watch for file creation, if the file is created, run some code and close the form.how to pass in some reference form. Using and new to vs2008. A bit of leap from VB 6.0.
Imports System.IO
Public watchfolder As System.IO.FileSystemWatcher
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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Hello, I have a WPF Window that I show with Window.Show(). When I click X the form closes. But it is still in memory and the GC never comes and cleans it up. Also I do not have any refrences/handles to it.
I am using the following code with the window:
Code:
Public Class PageWindow
Implements System.IDisposable
Public UserPressedExit As Boolean
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I was experimenting with ways to get rid of some memory leaks within my application the other day when I realized that I know virtually nothing about cleaning up my resources. I did some research, and hoped that just calling the .dispose() would solve all of my problems. We have a table in our database that contains about 65,000 records. Obviously when I fill my dataset from the dataadapter, the memory usage can get pretty high. When I called the dispose method on the dataset, I was surprised to find out that NONE of the memory got released.
View 3 RepliesI create class as Person and include a public sub Insert_DB I write down this code in form
vb
Dim MyPerson As New Person MyPerson.Insert_DB(Me.TextBox1.Text, Me.TextBox2.Text, Me.TextBox3.Text)
I tried to set Dispose to MyPerson (MyPerson.Dispose)but didn't show me Dispose
hi everyone i created a thumbnail dll for my file type my class dll create thumb for my files type but my class no dispose after create thumbnail this is my project : HPTShellExtThumbnailHandler.rar
View 5 RepliesOn the back of a Windows Form, I get a window DC, create a Graphics object with Graphics.FromHdc, and then dispose the Graphics object before releasing the DC.
Private Declare Function GetWindowDC Lib "user32.dll" (ByVal hwnd As IntPtr) As IntPtr
Private Declare Function ReleaseDC Lib "user32.dll" (ByVal hwnd As IntPtr, ByVal hdc As IntPtr) As Integer
Dim hdc As IntPtr = GetWindowDC(Me.Handle)
[code]....
Why did they do it this way?Should the DC be released before or after Graphics.Dispose?It is possible that the wrong order can cause resource leaks or memory corruption?
When you set a region equal to another, or set it equal to a new instance, do you have to call dispose on the region, or does VB do that? (I guess this isn't necessarily specific to regions)
ex:
'at some point in the code a region is created
Dim Rgn as New Region(SomeRect)
'....
[Code].....
If Rgn now points to the Rgns(0) clone, what happens to the original memory created by "New Region(SomeRect)"? Do I need to call dispose on Rgn before assigning it to the the Rgns(0) clone?
how do you correctly dispose a shape in vb.net ie when you draw a rectangle using the pen function how do I depose it so that it will disappear from the form, for some reason once its drawn if I draw a new shape it keeps the previous one and just overlays the new one and I use shape.dispose, and pen.dispose?
View 5 RepliesI used to always do the following:
con.close()
set con = nothing
Does con.Dispose() do both of the above 2 lines of code or do I do con.close() and then con.dispose()?
whats the difference of Me.Close and Me.Dispose...What code does releases memory resources that was used by ".show" command?Im currently creating a program and i just used both of them... is that ok?if it is ok... i know some commands have issues on what should i type first.. so what will i type first?
View 5 RepliesI Want to know garbage collector works in .net there is something heap and stack funda.so can u please tell me from where i get reference of whole funda of that.and i have another question is that Please see below the code.here i declare one dt and get
some data in it.and i don't want that dt after data come in text boxes.so in finally method i do dispose using dt.dispoe().
but after that i write little code to check whether the dt correctly dispose or not.so i check with if condition after disposing.you can check code given below for that condition.as per condition it gives me "Nikunj" Ouput in message box it meanse dt is not disposed after calling the dispose method.so can u please tell me why?And i Want to know about all resources which i used i want to know how can i free it.whether it is variable,object,datatable,datareader etc..... if it is any where with example then please give me link.and if it's from msdn then it's better. i want to know from Microsoft that
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I have Overloaded the Dispose method of System.Windows.Forms.Form Class in which I have written some extra code which I need to execute when object of Form Disposes. But when I create the object of Form in 'Using' statement, the 'End Using, statement do not execute my overloaded Dispose method. What should I do?
View 13 RepliesDim B() As Byte = File.ReadAllBytes(o.FileName) 'do Work here.<br/> B = New Byte() {0}
View 11 Repliesi am aware of the dispose method to free a resouce that is in use, but ive run into trouble and ive no idea how to dispose of an image because ive assigned it using the "new" keyword
While i < directorylist.Count
Dim imagePath As String = directorylist(i) + "\folder.jpg"
' ResizeImage(directorylist(i) + "\", imageName, 50)
Try
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i know that when i assign an image to a picturebox i can feel up the resource using picturebox1.dispose()here im using "new" so i dont know what to dispose of??
im loading images into 2 picturebox controls My app works as it should but i need to know when i should dispose of the images or does the garbage collector do it for me?on a user click the images change, i think that my app will become resource hungry and cause the app to bomb out at some point.So do i use Picturebox1.dispose() each time new images are loaded into the pictureboxs to free up the image from memory?
View 5 RepliesPublic Class TestControl
Inherits System.Windows.Forms.UserControl
Public Sub New(ByVal _mainForm As UserForm.MainForm)
MyBase.New()
mainForm = _mainForm
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I recently saw some VB .NET code as follows:[code]Does assigning Nothing to service do anything? If it is a garbage collection issue, I am assuming that when "service" went out of scope the referenced object would be garbage collected and the dispose method called on the object.It seems to me that assigning this variable Nothing can't really do anything, as there could be another reference to the object around so the reference counts haev to be checked anyways.
View 6 RepliesI have created a CMS-system and I am using it on different homepages. To manage updates quick and easy I made a administration-system for uploading the updates on all homepages on the same time. As long as I only have to overwrite the old files everything is going fine, but there are some few files on every homepage containing some different constants.
For that purpose I made this code:
Open the new file to be copied from my default cms-system:
Dim fs as new FileStream("D:WEBLOCALUSERmysite.dkskabelondefault.aspx",FileMode.OpenOrCreate)
Dim objReader as new StreamReader(fs)
Dim strFile as string = objReader.ReadToEnd
objReader.close()
[Code] .....
Sometimes first file is updated successfully, but for the next file I got this error:'D:WEBLOCALUSERmysite.dkskabelonempdefault.aspx' because it is being used by another process. I tried to close and dispose everything possible, but still the file is in use for minutes.
I am using VB.NET (Visual Studio 2008) and thus .Net framework 3.5. I have developed an application which has a MDI form and then has several other forms, most of which are shown using form.showdialog and some set of forms are shown using form.show.Whenenver a form (shown using form.showdialog) was closed (usually by clicking on a button (OK or Cancel)) I wrote code Me.dispose. After careful testing and R&D I figured this caused flickering on the screen. There use to be a flicker on the screen and it looked weird.In some rare circumstances if I clicked on button and form closed using me.dispose the focus of application was lost and some other program that was running came on focus. (This has happened but was rare.)Now the reason I used disposed was that after a form was shown using .showdialog I didnt want its contents to be in memory so I used the .dispose thing. But I noticed that If I use form.close then there is no flicker and form closes fine. But I think that would not dispose the form from the memory.
What should I do so that form closes and is disposes as well without any flicker.?I read on net that for forms shown using .show it gets disposed off automatically the moment it is closed (by using me.close) or user clicking on cross. Is this true? I also think that If I call a form using showdialog then I can write formx.dispose from where I am calling and not in the form itself.
I have a chart Component that was rendering based on my menu selection(say Sales data, Purchase data), I have two different class to render this, In main form i have a chart control(which was referenced by my appropriate class), When I choose "sales" both sales and purchase chart rendering event handler called, how to solve this?
View 1 RepliesHow to dispose the shared variable in vb.net.i am using shared object of Asterisk.NET Manager Variable, i assigned it in form load and i dispose it in main form closing, My problem is after closing the application, application.exe keeps live in task manager, if i not initializing the shared object in form load there is no problem,[code]
View 3 RepliesClass ComponentsContainer ' a component contains other components'
Inherits System.ComponentModel.Component
Private foo as New Component
Private bar as New Component
Protected Override Sub Finalize()
foo.Dispose() ' HERE ? '
bar.Dispose()
MyBase.Finalize()
End Sub
Protected Overrides Sub Dispose(disposing As Boolean)
[Code]...
how can i make sure i dispose of ALL my variables and sessions when i close the application?
i already have session.abandon(), but does it still keep all the other objects stored somewhere in the memory?
i've noticed that my w3wp.exe process keeps going up as i am testing my application. what is a good way to keep mem usage under control?
