Memory Management while Programing Web Applications?
Nov 19, 2010
I want to know how we will manage memory while programing web applications and how to know if there is a memory leak.I have an application which gets data from a view available in sql server and refreshes the grid every 2 secs using Ajax UpdatePanel. This page runs all the time in the client machine.How can I check whether the memory is used properly when its run all the time and doesn't cause any memory leak problem or any system crash.
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May 5, 2010
I have a problem regarding the SessionState Collection.I retrieve an object
[Code]....
I thought that i access a reference type. But calling the default constructor to build a new object seems not to work.The next time I access the object I still get the old one.
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Nov 15, 2010
Is this Possible that write a Socket by C# in ASP.net ?
for Example Can i write a Code Like this Perl Code in C# and asp.net ? :
> use HTTP::Request::Common qw(POST);
> use LWP::UserAgent; $ua = new
> LWP::UserAgent(agent => 'Mozilla/5.0(Windows; U; Windows NT 5.1; en-US; rv:1.8.0.5)Gecko/20060719 Firefox/1.5.0.5');
> $ua -> timeout(20);
> my $req = POST 'http://Example.com/',
> [ login_username => 'mehdi' , login22 => '654321' , go => 'submit'];
> my $content = $ua->request($req);
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Apr 24, 2010
I am using ASP.NET 2.0.
In my applicaion, I store some values in an ArrayList and store this Arraylist in a session variable. I want to know the size of this session variable in memory. Is there any method to do this.
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Jul 9, 2010
I have a DataTable which holds information on truck routes. When the user click on a route it display another table with details about the stop along that route. When they click a stop it shows what items were picked up at that stop. Three separate pages with 3 distinct DataTables. Currently I am storing them in the session. Normally, I would use the view state since the data only needs to live on that page. The reason I use the session is because each page is part of a Master pagelayout. There is an export button in the master page which gets the data in the session and exports it to an excel file. The issue is that when the user goes to the item level detail and uses a quick navigation link back to the route information the data for route is not reloaded into the session, just the page. If the user clicks export it will export the data set from the item level detail even though it is not displayed on the page
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Sep 17, 2010
How is the best way of putting a lookup table in memory for use though my ASP.NET app? Should I do this in the Global.asax's Application_Start event and keep in Session?
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Mar 4, 2011
I have a webpage which displays some data along with a banner. The banner image is stored in the database with parameters "Pagename" and "form".
The application has been coded in such a way that when the page loads , a function checks for the banner in cache memory first with the parameters "pagename" and "form". It the banner does not exist, the new banner is retrieved from the database and is added to the cache memory. Next time when the same page is called, the banner is displayed from the cache memory avoiding the DB to be hit everything to get the banner.
Now, I do not want a specific banner to be displayed on the page. I have removed that banner from the DB but the banner still gets displayed as this banner is still there in the cache memory.
Is there any way to delete the banner which exists in cache memory without making any code changes?
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Jul 30, 2010
Is it possible to share a cache between multiple ASP.NET applications? The apps may reside on different servers. How can one achieve this requirement?
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Oct 18, 2010
I would like to share the session variables between 2 applications. basically I have a website and in there I have 2 applications and want to share the session object betwen the two. Is there a way to set something in web.config to enable this?
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Jul 7, 2010
I have an asp.net solution in which there are two web application projects (client website and admin website) and also a class liabrary project in the same solution . In the live production server, the admin web app is within the client app (eg: client site= [URL] and admin site=[URL]). A class (with static variables) in class liabrary is userd to cache data. My problem is that i cannot get the changes to the static cache by one web project reflected to the other (becoz, i think, they seem to load in seperate appdomains).
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Jul 9, 2010
I have 2 different applications hosted on an IIS server. I have created a new application pool.Can i run both the applications on the same pool??Will sessions or other values of one application be available to the other application if I do it this way?
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Apr 22, 2010
i have two applications hosted on two different domains and both use a single login info so my question is how can i use / share same session across two application.
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Jul 14, 2010
I have 2 applications App1 and App2 on same domain, both with Forms authentication, each using a different database instance for authentication.
First, I open a browser with application www.mydomain.com/App1 and log on.
After that, when I open another instance of the same browser with application www.mydomain.com/App2 and log on, first browser loses session and goes back to login page.
I need each application on same domain to have its own session so that both can stay logged on.
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Dec 19, 2010
learn to use visual web developer but encountered a problem. I wat to be able to upgrade something and then as the lv goes up the time to do something goes down.
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Sep 18, 2010
I have two different IIS applications within the same domain(let us say www.mydomain.com) , both of these applications use the same database instance(same connectionstring), now what I want is that both of applications can see each sessions variables , can SQL Server session state mode helps in this case? Did someone try that before? Is there any other way to share the session variables?
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May 21, 2010
I am building an asp.net application, using II6 on windows server 2003 (vps hosting).
I am confronted with an error I didn't receive on my development machine (windows 7, iis 7.5, 64 bit).
When my wcf service tries launching my query running against a local sql server this is the error I receive:
Memory gates checking failed because the free memory (43732992 bytes) is less than 5% of total memory. As a result, the service will not be available for incoming requests. To resolve this, either reduce the load on the machine or adjust the value of minFreeMemoryPercentageToActivateService on the serviceHostingEnvironment config element.
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Oct 11, 2010
I have both VS 2005 and 2008 installed on my machine. 2005 is fine. For 2008, literally any asp.net project I try to create gets this eror. I try stepping into the code, and the error occurs apparently before anything that I can trap is loaded. There is no information written to the event log. I have tried this with a "Hello World" webpage with nothing else going on. Seems unique to my Windows Server 2003 machine.
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Jul 30, 2010
I am getting a weird error in asp.net while using leadtools imaging api. Here's the stack trace.
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SetThreadData(_THREADDATA* )
at Leadtools.Codecs.CodecsOptions.Use()
at Leadtools.Codecs.RasterCodecs.DoSave(SaveParams saveParams)
at Leadtools.Codecs.RasterCodecs.Save(RasterImage image, Stream stream, RasterImageFormat format, Int32 bitsPerPixel)........
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Jan 26, 2011
I am maintaining C# .NET code written by somebody else, I get following exception few times,Attempted to read or write protected memory. This is often an indication that other memory is corruptThe code structure where I get the above exception is somethign like this,- it is using ref variables in following sequence,Variable-1 and variable-2 are local variables in App1, - App1: func1() which passes these variables reference to func2(), - App1: func2() passes same variables reference via .net remoting to another application (App2).-App2: does the same passes same received reference to another call 2 times.- The execption is occured while returning from App2.
(App1:func1(ref Var1, ref Var2) --> App1:func2(ref Var1, ref Var2) <---App1 .net remoting to App2--> App2:func3(ref Var1, ref Var2)--> App2:func4(ref Var1, ref Var2)-->variables getting updated and function returned to original caller)
My doubts are ,1. Is passing reference variables in such chain is correct? will it cause such exeption? Does .net support ref variable call directly?
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Jun 7, 2010
I've been worked with web services so far, and I'm interested in expanding my services to console applications as well so I started digging up with WCF but I'm conserned that I won't be able to use the HttpContext collection that I've been used to do with web services one important thing which is to generate a random value from HttpContext.Current.Request.ServerVariables["ALL_HTTP"] that I need to reckon if it's the same or at least near what machine that is calling my service. How can I overcome this problem?
I need to know what machine is calling to count the number of attempts to login into my system for example. So must do it inside of the svc code otherwise if I let the client inform what ip address or what computer he is using, anyone could forge this argument and surpass by another machine. May be I'm approaching this matter wrongly. And I should count the number of attempts per state session, but how is it done?
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Jul 27, 2010
I have a memory leak somewhere that I cant find. Every few days my server will crash, and just before that I log a ton of SQL errors stating that it is "out of memory".
I cant find it anywhere, all of my connections are being disposed like so:
[Code]....
Then I call the connection from my pages like so:[Code]....
That is all pretty straight forward. The connection is disposed because it is implementing the USING clause. I am opening the connection in my connection manager class, and not where it is being utilized?Or, could the problem be in the below method I am using to populate a SqlDataReader:[Code]....
Now, at first it appears as though this could be the problem because the Connection isn't part of a USING clause, however doesn't the 'Data.CommandBehavior.CloseConnection' pretty much do the same thing. This makes sure that the connection is closed when the reader is closed, right? Here is how I call that above reader from my login page code behind:[Code]....
So the DataReader will get closed even without the .Close() because it is in the USING, and the connection should get closed because I specified it in the ExecuteReader paramters right?
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Aug 24, 2010
I have a memory issue on my websites and am trying to get to the bottom of it. I have downloaded the 14 day trial of ANTS Memory Profiler and have been playing with it to get a grip of what it's telling me. In the memory options on the timeline, I can see Bytes in All Heaps and Private Bytes etc but I am not sure which ones I should be focusing on to see where the memory spikes and doesn't go back down.I am profiling a ASP.NET website using ASP.NET 2.0.
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Apr 22, 2010
Our corporate intranet is designed so that each web application is a child application in the primary application.. Everything has worked fine with Visual Studio 2008 and even in 2010 running the website locally works great, the output directory for the child apps is ..in and the ProjectName.dll copies to that directory.. When I do a publish however it does not and I have to manually copy the dll from the bin folder in the project folder to the parent bin folder, this isn't hard of course but more of a pain in the butt each time I need to publish something. I made sure the output directory is correct for both debug and release yet on publish is just copies it to the child bin and not the parent bin as needed.
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Mar 18, 2010
I am using ITextSharp to generate pdf on the fly and then saving it to disk and display it using Frame.he Frame has an attribute called src where I pass the generated file name.his all is working fine what I want to achieve is passing the generated pdf file to Frame without saving it to disk.
HtmlToPdfBuilder builder = new HtmlToPdfBuilder(PageSize.LETTER);
HtmlPdfPage first = builder.AddPage();
//import an entire sheet
builder.ImportStylesheet(Request.PhysicalApplicationPath + "CSS\Stylesheet.css");
string coupon = CreateCoupon();
first.AppendHtml(coupon);
byte[] file = builder.RenderPdf();
File.WriteAllBytes(Request.PhysicalApplicationPath+"final.pdf", file);
printable.Attributes["src"] = "final.pdf";
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Feb 3, 2010
I have a procedure where I am building a table to store rows of data. I did not think this was to memory intensive. However my form does not seem load effortlessly. I call this procedure in the Form Load Event. Is there a more optimal place (Form Loading Event Procedure) to put code that may require a little more memory than usual?
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