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You main problem is that you do not check the response from your mciSendString commands so you have no idea whether any of them have succeeded.
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Recently, I had to track down why all of our new WPF screens were leaking memory. I rapidly dove into this issue and soon discovered that this issue was dispeared after I run the FOLLOWING code.
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Does .net not call the method?
I use the GC.CollectionCount method to get the number of times garbage collection has occurred for the 0/1/2 generation of objects and find they were 211/196/9.
It means .net Does do it.
Can somone tell me why it is occured?
PS: I have a test by open and closing 10+ screens, my app consumed 200+MB from task manager. According to the .net memory profiler and ANTS memory profiler, the objects created by my screens have been actually collected.
I also tested that if we forced a GC(Garbage Collector) collect by above codes, the memory will be reduced obviously.
Thanks,
Michael.
GC;Memory Leak
modified 21-Feb-13 21:08pm.
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Whenever you run GC.Collect(), only those objects that are not referenced anywhere are collected.
The numbers that you observe are those that are not cleared.
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For the most part .net GC "just works" in .net, obviously this doesn't happen in all cases. It is rare to need to do an explicit GC. This[^] is probably worth a read. The most relevant part to this question is when GC takes place, to quote:
- The system has low physical memory.
- The memory that is used by allocated objects on the managed heap surpasses an acceptable threshold. This means that a threshold of acceptable memory usage has been exceeded on the managed heap. This threshold is continuously adjusted as the process runs.
- The GC.Collect method is called. In almost all cases, you do not have to call this method, because the garbage collector runs continuously. This method is primarily used for unique situations and testing.
When one of these happens, GC takes place.
If you do something that takes up a lot of memory then it can be a good idea to GC, but it is generally discouraged. This is really a tuning thing and depends on your app, if the performance is degraded then you probably do need it.
Hope this answers your question.
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micwu wrote: Can somone tell me why it is occured?
Without seeing your code base, no. I'm going to take a wild guess here that you have strong event handlers that aren't being released, or you possibly have an issue with data bindings not being cleared from items such as the DataGrid. Attach a profiler, run the application and investigate the issues. What you currently have here is masking the real problem.
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I have a test by open and closing 10+ screens, my app consumed 200+MB from task manager. According to the .net memory profiler and ANTS memory profiler, the objects created by my screens are actually ok-to-collected.
I also tested that if we forced a GC (Garbage Collector) collect by following codes, the memory will be reduced obviously, back to the memory volume level before screens are open.
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
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Never, ever, use Task Manager as a means of determining whether or not your application is leaking memory. Unless you are looking at the Private Bytes allocation, what you see in Task Manager is the amount of memory that has been allocated to your application by .NET for it to potentially use. This isn't memory that's in use, it's memory that your application could use if it needed to. The thing about this memory allocation is that the runtime can take it back if it needs to, so it's possible to watch wildly varying memory depending on the load on your system.
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The question nobody has asked is what makes you think it's leaking memory?? Did you look at Task Manager or run this under a memory profiler? Hint: One of these lies to you when looking at a .NET app.
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I had a test by open and closing 10+ screens, my app consumed 200+MB from task manager. And according to the tool .Net Memory Profiler and ANTS Memory Profiler, the objects created by my screens are actually ok-to-collected.
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If Windows wants the memory back, the .NET CLR is more than happy to collect and return as much as it can. The GC will also run whenever it gets a sense that it "can" and/or needs to. It's, really, very good at its job. You can see an example of this just by watching the Task Manager and launching your app, then minimizing it.
The CLR will try to keep a pool of memory (managed heaps) available for your apps object allocations. Objects that are collected get the memory returned back to the managed heap, NOT to Windows. This keeps allocation speeds fast compared to allocating a block of memory from Windows, adding it to the heap, and then allocating your object. If the memory is already in the heap, there's no round-trip to Windows to get the memory first.
What Task Manager is showing you is how much memory is RESERVED by the .NET CLR for your app, not how much your app is actually using. But, like I said, if Windows needs the memory back for any reason, the .NET CLR is more than happy to give as much back as it can. You really don't need to worry about what you see in Task Manager. It's not representative of what your app is actually doing and should not be used to generate your applications system requirements.
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If you have third-party plugins or are using old (unmanaged) code this might be the culprit.
I'm pretty sure you can write .Net (managed) code that has memory leaks, but in that case you probably did something funky. I doubt standard WPF code has memory leaks.
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I think maybe there is no memory leak for my app but .Net GC doesn’t run the collect as we expected.
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Long ago, I run into OutOfMemory exceptions when doing a lot of graphics operations. After adding some calls to the Garbage Collection, especially GC.WaitForPendingFinalizers();, the problems were gone, the maximum memory use was reduced to less than a tenth of the capacity of the computer. My impression is that garbage collection just happens to slowly in such a case.
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Hey,
is there a thing to do httpwebrequest trought a socks 5 proxy ?
Sorry for my english :-S
Regrads
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There's no direct support inside HttpWebRequest to achieve this. You might want to use an alternate method instead. Take a look at this[^] for a solution.
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how to resize a image inside a preview panel using c#..the image should be highlighted in the panel preview box...when it is clicked in the list view box..kindly help me for my answer
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Please be more specific on what have you tried so far and where exactly you are stuck and need help with.
Steps:
1. Have image list (list view)
2. Define handler for onclick of list items
3. Have preview panel box displayed
4. Show the item selected with defined height & width in preview panelbox.
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k i wil say clearly..........i hav added an image in panel preview box..it is displayed in list view also......after i made selection in list view...i must move the image with mouse pointer and must resize the image with mouse pointer...............
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Hi, so I'm having trouble with my coding. I've already figured out for to take money from Tom and Rob, but i can't figure out how to deposit that value into the bank. here's what i have so far.
I would really appreciate it if, someone would take a look.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Lab05_E00995877
{
public partial class Form1 : Form
{
//Add your form1 variables
Person Tom;
Person Rob;
decimal bank = 50M;
public Form1()
{
InitializeComponent();
//Initialize (create) Tom and Rob
Tom = new Person();
Tom.Name = "Joe";
Tom.Cash = 150M;
btnGetOne.Text = "Get from " + Tom.Name;
Rob = new Person();
Rob.Name = "Bob";
Rob.Cash = 200M;
btnGetTwo.Text = "Get from " + Rob.Name;
UpdateForm();
}
public void UpdateForm()
{
lblFirstName.Text = Tom.Name;
lblMoneyOne.Text = Tom.Cash.ToString();
lblSecondName.Text = Rob.Name;
lblMoneyTwo.Text = Rob.Cash.ToString();
lblMoneyBank.Text = bank.ToString();
}
private void btnGetOne_Click(object sender, EventArgs e)
{
decimal decAmount, decTomAmount, decRobAmount, decBankAmount;
try
{
decAmount = Decimal.Parse(txtMoney.Text);
decTomAmount = Decimal.Parse(lblMoneyOne.Text);
decRobAmount = Decimal.Parse(lblMoneyTwo.Text);
decBankAmount = Decimal.Parse(lblMoneyBank.Text);
//bankamount (bank) Amount punched in (decAmount)
if (decTomAmount >= decAmount)
{
decTomAmount -= decAmount;
lblMoneyOne.Text = Tom.ReceiveCash(decAmount).ToString();
lblMoneyBank.Text = bank.ToString();
//What do i put here to add to bank after subtracting from Tom?
UpdateForm();
}
else
{
MessageBox.Show("Tom doesnt have this many!");
}
txtMoney.Clear();
txtMoney.Focus();
}
catch
{
MessageBox.Show("Please enter numbers only!");
txtMoney.Clear();
txtMoney.Focus();
}
}
private void btnGetTwo_Click(object sender, EventArgs e)
{
decimal decAmount, decTomAmount, decRobAmount;
try
{
decAmount = Decimal.Parse(txtMoney.Text);
decTomAmount = Decimal.Parse(lblMoneyOne.Text);
decRobAmount = Decimal.Parse(lblMoneyTwo.Text);
//bankamount (bank) Amount punched in (decAmount)
if (decRobAmount >= decAmount)
{
decRobAmount -= decAmount;
lblMoneyTwo.Text = Rob.ReceiveCash(decAmount).ToString();
lblMoneyBank.Text = bank.ToString();
//What do i put here to add to bank after subtracting from Rob?
UpdateForm();
}
else
{
MessageBox.Show("Rob doesnt have this many!");
}
txtMoney.Clear();
txtMoney.Focus();
}
catch
{
MessageBox.Show("Please enter numbers only!");
txtMoney.Clear();
txtMoney.Focus();
}
}
}
}
This is the other part defining the class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Lab05_E00995877
{
class Person
{
public string Name;
public decimal Cash;
public decimal GiveCash;
public decimal ReceiveCash(decimal amount)
{
if (amount > 0)
{
Cash -= amount;
return Cash;
}
else
{
MessageBox.Show(amount + " isnt an amount I'll take",
Name + " says..");
return 0;
}
}
}
}
modified 21-Feb-13 0:20am.
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Jimmy1734 wrote: //What do i put here to add to bank after subtracting from Tom?
bank += decAmount; ..but then again, how would you track that it's Toms' money? How much of those 50M belongs to Tom, and how much belongs to Rob?
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Hi,
i am new in this encoding decoding stufs and i have some problem.
I work on VS 2012 ASP.NET c#.
My problem is that i need to create CheckSum value from some input string. The length of the CheckSum need to be 16 bytes (32 characters) long like this one: "8A303F3E0CB4F8A9CDA5AC120F9B90A4".
The encryption need to be done using a pass key for example TEST_PASS and this key will be used latter to be decrypted this hash value....
hope you understand what i ask and what i need pls help me
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You can hash, but you can't dehash.
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Look again at the specs for encryption/decryption. That looks trather like a multistep step procedure:
- user enters password
- system generates salt
- system generates hash from salted password and derives both CheckSum and actual password for encryption
- system stores salt and CheckSum in the encrypted file
- system encrypts input file with the actual password generated above.
When you want to decrypt the file, you can check the password by calculating the CheckSum. The decrpytion algorithm might work with a wrong password too, just producing a nonsense output...
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First, MD5 is a cryptographics HASH, NOT an encryption.
Second, it's a ONE-WAY hash. There is no such thing as "decrypting a hash". In theory, you cannot get the original content back from a hash value.
Lastly, MD5 is considered broken and should no longer be used in production code. It just doesn't take that much computing power to break it in todays world. Also, two different pieces of content CAN produce the same hash value using MD5!
Use something a bit stronger, like SHA512 instead and use proper salting techniques to make it even harder to break.
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Hello,
Below is a piece of code, where in I am trying to post a file from my pc to remote development server. For some reason it does not seem to be working. I don't see the file on the remote server.
private void button2_Click(object sender, EventArgs e)
{
FileStream filetoupload = new FileStream("C:\\projects\\testfile.csv", FileMode.Open);
Uri address = new Uri("http://devsrvr/hints/");
HttpWebRequest webreq = HttpWebRequest.Create(address) as HttpWebRequest;
webreq.Method = "POST";
webreq.ContentType = "application/x-www-form-urlencoded";
webreq.Timeout = 15 * 1000;
byte[] bytedata = UTF8Encoding.UTF8.GetBytes(filetoupload.ToString());
webreq.ContentLength = bytedata.Length;
try
{
using (Stream poststream = webreq.GetRequestStream())
{
poststream.Write(bytedata, 0, bytedata.Length);
}
MessageBox.Show("done!!");
}
catch (Exception ex)
{
ex.InnerException.ToString();
ex.Source.ToString();
ex.Message.ToString();
}
}
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