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Seriously? This is your reply. Your profile says "I am a researcher, and a writer. I write books and research papers." but apparently you aren't prepared to read them.
You have been told a viable approach to take, one which will help you decide on an appropriate solution based on the fact that you appear vague about techniques. You haven't shown any code so we can't actually talk through your existing architecture but fly at it - you want to keep the attitude up, good luck with solving your problem. Alternatively, you can check the attitude and listen to the advice you are being given.
This space for rent
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Please do not be rude. Your question was not very specific at all and so it is very hard to answer. He gave you some good advice based on the fact that you mentioned you wanted to understand parallel programming and have high performing code.
If you want a more specific answer you need to ask a more specific question.
There are only 10 types of people in the world, those who understand binary and those who don't.
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nqioweryuadfge wrote: Web server that employs parallel programming to interact with client requests.
You can write code to handle parallel programming but I'm not sure how much it helps in web development. When someone hits your page or your webservice IIS responds by executing the code. If someone else hits the same exact request while the first is still processing IIS automatically fires up a new thread to handle it anyway. If you get to where you server cannot handle the load then you implement load balancing which involves implementing more servers but probably requires no code changes.
nqioweryuadfge wrote: how would I know if it can support 1000 clients or Multiuser functionality at all?
You'd have to ask the vendor or read the specs. Again, if it is hosted in IIS, then IIS is handling it for you.
There are only 10 types of people in the world, those who understand binary and those who don't.
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Your going on the assumption that the client requests can run in parallel.
The type of request; bandwidth; number of cores; I/O; ... all influence the ability of an app to scale.
So, "it depends".
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Hi guys,
in an example, i saw this line of code....
public event PropertyChangedEventHandler PropertyChanged = delegate { };
What does this mean?
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This is a trick to ensure that there is always a handler hooked up to the PropertyChanged event. With this, you can remove the null checking inside the code that calls the event handler. It changes this code:
protected void OnChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}to this
protected void OnChanged(string propertyName)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
This space for rent
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Interesting. Not seen that before.
Regards,
Rob Philpott.
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It's a place holder that assigns an empty method - one that does nothing - to the event in case no handler method is ever assigned. That way, if it isn't used by the rest of the application, it doesn't crash when the delegate is used.
It's a bit like saying
List<string> list = new List<string>(); Instead of
List<string> list = null;
So when you use the collection:
list.Add("hello world");You don't need to check that a list is assigned first to prevent your app crashing:
if (list == null) list = new List<string>();
list.Add("hello world");
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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thanks guys for the answers. It helps a lot. 
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The new ?. operator alleviates the need for this. The recommended way of invoking an event handler is now
PropertyChanged?.Invoke(this, EventArgs.Empty);
(or whatever the arguments should be)
Cheers,
Mick
------------------------------------------------
It doesn't matter how often or hard you fall on your arse, eventually you'll roll over and land on your feet.
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the below code is working perfect for single item selection but i am unable to select more them one item and display corresponding data from database in datagridview.
SqlDataAdapter sda=new SqlDataAdapter();
DataSet ds=new DataSet();
SqlCommand scmd=new SqlCommand();
BindingSource bsource=new BindingSource();
private void button1_Click(object sender, EventArgs e)
{
int i = checkedListBox1.CheckedItems.Count;
if (checkedListBox1.SelectedIndex == -1 && checkedListBox2.SelectedIndex == -1)
MessageBox.Show("Please select");
else
{
for (int j = 0; j <= i-1; j++)
{
string s = "select * from grp where Groupname = " + "'" + checkedListBox1.CheckedItems[j].ToString() + "'";
sda = new SqlDataAdapter(s, con);
ds = new DataSet();
SqlCommandBuilder scb = new SqlCommandBuilder(sda);
sda.Fill(ds, "grp");
bsource.DataSource = ds.Tables["grp"];
dataGridView1.DataSource = bsource;
}
}
}
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You are resetting the data source of dataGridView1 each time round the loop, so it will only ever refer to the last one selected.
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Hi,
I am developing now an application that will generate barcode for items and I need the application to print this barcode and I don't have any experience how to integrate with printers.
My question what I need to use barcode printers?
Is this a straightforward? or need to know more about Printer API?
I've already see articles about specific model "EPSON L90" and its APIs but I need more examples to see how to walkthrough.
Thanks
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Start with the manufacturer's site: they will almost certainly have example code together with the appropriate API which will get you started.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hi, I have been learning C# for over 6 months and learnt alot of it by building a text based RPG using SignalR to make it multiplayer. It's hosted on GitHub[^]
Wondering if anyone is interested in dropping in and helping me out by adding features, improving code, unit tests etc. It has a MIT license. Hoping someone better than me will contribute so I can learn the how and why off them.
Thanks. 
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It might be worth moving this message to the "Collaboration / Beta Testing" forum. You'll find it under "Product Lifecycle" in the LHS menu.
Good luck!
Peter
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Good morning
i am beginner in c#, i can create form and other datagridviewer
but i am not able to connect my database witch hvae 17tables create in access2007 in c#.
i try to do but i have not get to do it.
please help me
i am trying to make a soft ware tour trade.
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How have you tried?
What code did you use?
Did you get any error messages, and if so, what where they, and where were they?
We need to know what you have done, as otherwise our answer could be miles away from the solution you need - and there are a lot of different ways you could have tried to do this and be having problems.
Remember that we can't see your screen, access your HDD, or read your mind! 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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You haven't given a lot to go on.
Can you actually make a connection?
Are you able to query the tables?
Is the displaying data an issue?
I would make sure your connection string is correct Access connection strings - ConnectionStrings.com[^]
also here is some MSDN example on connecting to an access database from C# ADO.NET Code Examples[^]
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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hello People,
Need your help in understanding .NET better. I know some basic stuff. problem is whenever I learn something new I dont remember it after few days. how can I implement these concepts so that I can memorize them better.
TIA
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Practice, practice, practice. It's the only way.
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Google is your friend. Reviewing old code for a technique or snippet is valuable. I stopped trying to memorize this crap years ago.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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Get a book, and go through it cover to cover, doing all the exercises.
Then do them again.
After that, it's practice: there is no short cut - you remember best what you use, so if you don't use it you will lose it!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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OriginalGriff wrote: so if you don't use it you will lose it
 so true, especially as you get older. Knowing that you have done a thing before and forgetting where you used it is endlessly frustrating.
Never underestimate the power of human stupidity
RAH
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