yes...it will...though I have been doing some research and I think a DB25 serial connector will be easier to work with if I use an IC with Darlington pair arrays to interface the PC port and the LEDs.
I now need references.
any help will be highly appreciated.
For how to send commands though a serial inteface I only can refer to one of my article[^]s becausee I have not much expeience with hardware programming. Maybe the manual of the DB25 connector gives you some information.
If you want other opinions you may should ask about experiences with the DB25 connector and the IC you want to use in the Hardware & Device forum[^].
Considering todays machines are not even coming with serial and parallel ports, you're entire premise of using them is already dead in the water and limited in scope to the lifttime of the hardware that you are currently using.
Since you already know a bit of eletronics, just go with a microcontroller that can run the .NET Micro Framework and be done with it!
Oh! and those can already be programmed over USB using Visual Studio 2008 and up, if not VS2010 and up.
By writing appropriate code for what you want to do.
What did you think the answer was going to be with a question like that??
In all seriousness, if you want to use C#, get a Netduino[^] or a FEZ Panda[^] microcontroller and learn how it's really done, without risking your computers expensive hardware. You'll also learn alot about digital electronics if you really want to teach yourself. Try getting this book[^] or this one[^].
it depends on what you need , if you have a Com ports you can use it easily with some hardware buffer and amplifier , or you can use any controllers, if you are not familiar with Arduino or PI , try to find a CanaKit board, its very easy and with LED's and Relayed output.
optoisolator for each of the used lines(ie Protect the PC interface
next a latch (something to hold the data)
drivers (for lighting the lighty things)
r r r r r r r
e e e e e e e
s s s s s s s
i i i i i i i
db25 s s s s s s s
╔═╗latch sig t t t t t t t
-║-║------| o o o o o o o
║ ║ | r r r r r r r
║ ║ ╔═╗ ╔═╗ ╔═╗ | | | | | | | //led
-║-║-║ ║-║ ║----║r║-----o-------------------|>-----o
-║-║-║ ║-║ ║----║s║--o----------------------|>-----o
╚═╝ ╚═╝ ╚═╝ ╚═╝
each of the lines are attached to a pull up resistor
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.
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.
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.
I was brought up to respect my elders. I don't respect many people nowadays.
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.
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.
I was brought up to respect my elders. I don't respect many people nowadays.
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.
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.
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.
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.
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...............
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.
public partial class Form1 : Form
//Add your form1 variables
decimal bank = 50M;
//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;
public void UpdateForm()
lblFirstName.Text = Tom.Name;
lblMoneyOne.Text = Tom.Cash.ToString();
//What do i put here to add to bank after subtracting from Rob?
MessageBox.Show("Rob doesnt have this many!");
MessageBox.Show("Please enter numbers only!");
This is the other part defining the class
publicdecimal ReceiveCash(decimal amount)
if (amount > 0)
// person money punched in
Cash -= amount;
MessageBox.Show(amount + " isnt an amount I'll take",
Name + " says..");
modified 21-Feb-13 0:20am.
Last Visit: 31-Dec-99 19:00 Last Update: 30-Apr-16 18:40