Cached Objects Staying In Memory?

Mar 24, 2010

I have a asp.net web forms app that uses System.Web.Caching.Cache to cache xml data from a number of web services for 2 hours.

webCacheObj.Remove(dataCacheKey)
webCacheObj.Insert(dataCacheKey, dataToCache, Nothing, DateTime.Now.AddHours(2), Nothing)

Every 90 minutes a Microsoft Search Server hits a particular (spider) page which calls the code to put the objects into the cache.The issue i have is that over a period of time, the memory usage of the application grows exponentially. Lets say that in a week, the memory usage of the application pool grows to over 1gb

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Free Memory Of .net Objects?

Dec 18, 2009

Am using lots of .Net and Indesign Objects in my StandAlone APplicataion.My Application is crashing because of memory usage [Memory allocation and deallocation].Will it deallocate if i use the following for the object: Object=nothing how to free memory of .net and Indesign objects and for which i will have to free memory.

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.net - VB/C# Group Objects By Key - Performance (memory)?

Dec 8, 2010

I am reading from a log file.My target is to display the 10 most popular requested URL's of a website.One way to do this is to read all log entries and save each URL to a Dictionary. The dictionary has the URL as the Key and the number of visits as the Value. If a URL exists in the dictionary the Value of that URL's Key is increased +1, otherwise a new Key/Value pair is added with a value of 1.

Once the processing is finished the dictionary is sorted by Value and the top 10 entries are shown.This might work, however it could cause a serious memory problem when dealing with a log file of a website which has thousands of different page url's (think query strings).Since I only need the top 10 entries, is there a way to avoid placing all the URL's into memory and still get the top 10 URL + Visits count?

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VS 2008 Change A Property Of All Objects In Memory?

Jul 18, 2011

I want to loop through all objects that are loaded in my project ofType x and change a property in each of them... Is there any way to do this?

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VS 2008 Staying On Top Of Desktop

Jun 29, 2010

Is there a way to keep my application on top of the windows desktop, but other aplications can run on top of it?Like Windows Vista/Windows7 widgets.

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Service Not Staying On Unless Started Manually?

Nov 7, 2011

So I have this Windows service created in VB.Net, and all it does is perform a few calls and sits there.I have it installed on a test machine and when I start it manually, it starts up. When I stop manually, shuts down properly (onStop is called).When I start it, and reboot the machine, the service starts like it should, but when I log in, the service isn't running anymore and the onStop never showed up as being executed.I installed the service with admin privileges, so that shouldn't be an issue.Here is what I have:

Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()[code].....

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VS 2010 Date Not Staying As Shortdate?

Apr 21, 2011

I am making a small bill manager program. I have setup a listview and I am using access db. Things are working great and when I pay a bill it enters in the database perfect, but when it is shown in the listview it shows the date plus the time. Why does it show correct in the database and not in the listview? I tried using .ToShortDateString instead .ToString but then it just tells me it doesn't like late binding.

[Code]...

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Make My Form In Program Staying Top Of Other Windows?

Jun 26, 2010

I have a form in vb.net with a checkbox and I want it to stay in top of other windows if the user checks the checkbox and not to stay in top of other windows when the checkbox is not checked

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SplashScreen Staying Open Even After Application Exits?

Apr 30, 2012

Windows Forms VB Application.. I added a splashScreen to my application. And it was flashing only for a second then going away so I added a sleep timer to my Form Load event... The problem is now the splashScreen stays open even After Application exits, instead of simply closing at the end of the sleeptimer.. The Part of the Form Load event that is causing this is as follows:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
Threading.Thread.Sleep(5000)

[Code].....

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Timer - .net Console App Pausing And Staying Open?

Mar 20, 2012

i am trying to understand how to keep my console app open even after it gathers data and sends it off. I am converting a GUI to the console app. It has a timer that fires the sub every 20 seconds. But it doesnt seem like it works in the console app since after it fires off the sub it closes the app without waiting.

[Code]...

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VS 2008 - ListView Selected Row Not Staying Shown

Dec 23, 2010

I have a listview control setup with full row select. When I select a row and then tab to the next control, the selected row is no longer selected visually. Is there any way to keep it marked so the use knows which row they selected even when the focus is on another control?

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VS 2010 Merging Toolstrips (MDI) - Staying Separate

Nov 30, 2011

I have a parent MDI form and several MDI children. All have menustrips and toolstrips. The merging of the menustrips was no problem at all but I'm trying to do the same thing for the toolstrips, but now it's a no go. The toolstrips are staying separated. Is it possible to merge toolstrips?

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.net - Using .Contains Method With Cached Hashset

Jul 26, 2011

I know that the .Contains method on a hashset is fast. My question is what is the best method for getting the hashset data before repetitively using the .Contains method?

I can think of 2 options. Both of these examples would be called in a loop of undetermined length.

1) Call the method that returns the cached hashset directly and use the .Contains method.

IF (GetHashSetMethod.Contains("TESTVALUE") THEN BLAH, BLAH, BLAH...

2) Create a new hashset outside of the loop and load the cached hashset data into it so the method that returns the hashset is only called once, then use the .Contains method.

DIM HashTest AS HASHSET(OF String) = GetHashSetMethod

Then in loop:

if (HashTest.Contains("TESTVALUE") THEN BLAH, BLAH, BLAH...

I have been using method 1. Should I even think about switching to method 2? Is there a 3rd option I haven't even thought of? Does it even matter because the data is cached to begin with?

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IDE :: Cached Items In Toolbox?

Jun 10, 2010

I have a rather large project that several developers access via MS SourceSafe. The issue at hand is the ToolBox lists many, thirty plus, items that start Cached.(the name that follows Cached is the name of a class or Cyrstal Report in the project. There are also many items listed, they have the same "gear" icon, without the word Cached prefix on the class name.

My question is, how can I get these items out of the ToolBox so they never come back?

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Is Size Of Lists Cached In Some Way

Jan 17, 2010

Is the size of Lists cached in some way (calculated the first time you call it, and then retained untill some change is made to it), or does it get calculated every time you call the Count property? Same question for arrays.

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Linq2SQL Counts Getting Cached?

Sep 23, 2009

I've got a very simple data structure. I'm using SQLExpress with Linq2SQL and vb.net

**ParentClass**
parentId
name

[code].....

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Reading Cached Images?

Jan 31, 2012

I've been working on my own web browser for a few years now using the webbrowser control in VB.Net.The following routine allows me to pull images on a web page that are stored in the cache:

Private Function GetCachedURLPath(ByVal lpszUrl
As String)
As Boolean

[code]....

This routine has worked well for me, but there are some pages where it is unable to pull the image from the cache. What discovered is that when a web page host images on a different server than the page hosting server, the images get stored in the cache with the address from the image server instead of the src address listed in the IMG tag. Given that I am using the URL from the src in the IMG tag, the routine fails to provide a return path.In most instances reloading the page puts the image into the cache with the same address as the scr record. It was fairly easy to write a routine that automatically reloaded the page when I could not find the image in cache, but one of the things I want to address in my latest revision is this issue.

I have a routine that allows me to run through all of the URL's for the files stored in the internet cache and using that I can figure out the correct URL for a picture, but this seems to me to be about as cumbersome as reloading the page and can be time consuming if the page has a lot of images.I can cut down on the time if I modify the routine to only run through the list on exceptions, but this just seems inefficient to me, especially since I have to make an assumption about what part of the image URL's are the same. What I'd like to do is to track the sources of the images as the web page is being drawn so that I have a listing of all the real source URL's for the images instead of having to rely on what is referenced in the src attribute.

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SelectList Cached By AJAX?

Sep 20, 2011

I have a DropDownList in MVC which grabs a SelectList initialized and populated by a controller. The goal of the specific page that said list resides on is to reply "You have selected option X" immediately to the user without refreshing (using Ajax).The problem I'm running into is that for some odd reason, while the dropdown renders properly and even posts back correctly, any attempts to add new options or modify previous response messages are in vain.

My View:
<script type="text/javascript" src="../../Scripts/MicrosoftAjax.js"></script>
<script type="text/javascript" src="../../Scripts/MicrosoftMvcAjax.js"></script>

[code].....

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Repeater And Cached Dataset - Only Last Row Shown?

Jan 13, 2012

I have a relatively simple piece of code as follows:

Dim oShow As DataSet = Nothing
Dim cacheKey As String = String.Format("AsyncCacheFor_agenda_{0}", ShowID)
If Not IsNothing(Cache(cacheKey)) Then

[code].....

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Implement A Non-cached File Copy Using 2005?

May 7, 2009

I have a program I wrote that copies select files from one remote computer to another.
The set up I for testing is, one computer(a) at home running the program connected to my work's network via VPN and two computers(b,c) at work side by side on the same network. I am trying to copy the files on computer b to computer c, while the program is running on computer a.

The only thing wrong with this is, the files seem to be caching to a temp folder on computer a then going to computer c. When it should be going straight from computer b to computer c. Is there a way to keep the files from trying to cache on the computer running the app?

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Keeping Tables Cached On Server In Project

Mar 7, 2010

I have an ASP.NET project which is a front-end to a database. In addition to the large tables, the DB contains a few small tables to help normalize the larger tables with common values. I have a VB.NET project which loads the smaller tables into memory, using "Shared" (i.e., "static" in C#) member variables, and uses them. I have a call to load the tables in Global.asax - Application_Start. This works for a while. That is, Application_Start runs when I first run my project, loads the cached values, and will correctly keep them in memory for a while.

What I'm seeing (when running my project via Visual Studio 2008 Debugger, hosted locally) is:

A) The Application_Start code will run more than once. Not in a row, but after the user has navigated to some other pages, I'll see (my breakpoint in) another call to initialize the cache, coming form Application_Start. Is it expected?

B) The "Shared" variable that was set to True when the cache was initialized is now False again (which should only happen when the class is first loaded). Similarly, all the data that was chached is no longer present. That is, it looks like VB is unloading all the Shared members. Is this expected?

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Syntax To Change The Value Of A Cached Object Property?

Jun 6, 2010

In an ASP.NET 3.5 VB web app, I successfully manage to cache an object containing several personal details such as name, address, etc. One of the items is CreditNum which I'd like to change in the cache on the fly. Is there a way to access this directly in the cache or do I have to destroy and rebuild the whole object just to change the value of objMemberDetails.CreditNum?The cache is set using:

Public Shared Sub CacheSet(ByVal key As String, ByVal value As Object)
Dim userID As String = HttpContext.Current.User.Identity.Name
HttpContext.Current.Cache(key & "_" & userID) = value
End Sub

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Cached Entities Making Round Trip To Database?

Jan 9, 2012

i am caching objects, if i make linq queries on cached entities then... will theses queries make database round trip due to lazy loading in Entity framework?

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RemoveAll Is Also Changing Previously Cached Data That It Should Not Be Able To Change?

Apr 28, 2011

This has been driving me insane all day and I think I have the problem narrowed down, but it just doesn't make sense how it could be happening. I have 2 public shared functions and 2 private shared functions. One provides a list of custom objects and one filters the objects based on some parameters in the function call. Both return List(of custom object). The 2 private shared functions are the predicate functions used in the List(of t).RemoveAll function.

[Code]...

Now, the next time I call the GetItemList function it only returns 50 item objects, not the 100 item objects that it should be returning due to the cache being set! I have verified this in the debugger and by running many, many different tests to see what combinations of parameters may be causing the problem. In my testing, as soon as one of the .RemoveAll functions is used the GetItemList item list will get set to whatever the NarrowItemList function returned.

Even if the cache wasn't being set correctly, shouldn't it just get the data again from the database and return 100 items again? What could I be missing???

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UserPrincipal.Current.ChangePassword Does Not Update Cached Credentials

Jun 29, 2010

I'm writing a program which assists users update passwords for our windows systems and some other applications. Everything is working except when I call the UserPrincipal.Current.ChangePassword command cached credentials are not updated like they are when you change a password using the windows OS password change.

That is: when a remote user who is VPN'd in uses my application to change passwords, when they reboot and VPN is disconnected, they are forced to login to windows using there old password.

Is there a way I can force windows to update the cached credentials to the new password so upon reboot they are able to login using this new password?

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Web Browser Control Working Offline - (Cached Web Pages) Only?

Aug 18, 2011

Is there a way to work the web browser control for viewing off-line (Cached web pages) only? Is it possible to view cached web pages from IE9 on a web browser control off-line? The reason i am asking this question is because IE9 automatically switches from off-line mode to on-line mode when it cannot find something in the cache by default. For forensic purposes this is not acceptable for these reasons: Active content (Viruses, java script, activex cookies etc)

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Fastest Alternative To Datatable.Select To Narrow Cached Data?

Sep 28, 2009

I have a search function on my company's website (based on .NET 2.0) that allows you to narrow the product catalog using up to 9 different fields. Right now, after you make your selections on the frontend I am building a dynamic query and hitting the database (SQL Server) to get the resulting list of items numbers. I would like to move away from hitting the database everytime and do all of this in memory for faster results. Basically a 3500 - 4500 row "table" with 10 columns: the item number (which could be a primary key) and the 9 attribute fields (which have repeating values for many many rows).

There can be any number of different searches between the 9 columns to get the items you want:
Column A = 'foo' AND Column D = 'bar'
Column B = 'foo' AND Column C = 'bar' AND Column I = 'me'
Column H = 'foo'
etc...

Based on my research, the .Select() function seems like the slowest way to perform the search, but it stands out to me as being the quickest and easiest way to perform the narrowing searches to get the list of item numbers:
MyDataSet.Select("Column B = 'foo' AND Column E = 'bar' AND Column I = 'me'")
In my specific case, what method I use as an alternative that has the same narrowing functionality and better performance instead of settling for the datatable.select() method?

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Sql Server - Rolling Back Entity Framework Transaction, Cached Item Persist?

Aug 23, 2011

I'm using an Entity Framework context, and sometimes would like to create a transaction so that the client can do multiple changes and then commit/rollback them all together.However, if many changes were made, and SaveChanges() was called multiple times, after which a rollback is called, entities that were commited already, will remain the way they were commited, and would not roll back.Here's how my transaction-relative functions look like:

Public Sub BeginTransaction()
Dim context = HttpContext.Current.GetObjectContext()
If Not context.Connection.State = ConnectionState.Open Then
context.Connection.Open()
End If

[Code]...

Not only does the test fail, but it also leave the ObjectContext in an unstable mode, because it still has invalid changes in it.

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Loading An Image From A Jpeg That Exists In Memory (but Not On Disk) Using Direct Memory Access

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

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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