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Greetings and thank you  .. Answer like a fire escape 
I am a new user to the language of C #, I used VB to control
May be most programmers in C # to develop the site or building applications 
But the question of experience in Pic
Can I write programs and transfer the file to Hex in C # ???? 
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There is no compiler for C# to pic or any other microcontroller. It is very unlikely that there would ever be one, nor would I want to use it if there were. C# is heavily heap based; garbage collection is a necessity and would increase in frequency with the reduced memory associated with microcontrollers. If you want a garbage collected memory system in a real-time environment, then you need to think quite carefully about the implications: What happens when you need a variable under interrupt and the garbage collection is required?
I would normally use Assembler, C or C++ but with caution: I never use malloc/free or new/delete in an embedded system because I would expect the unit to run 24 hours a day, 365 days a year. Since malloc/free and new/delete can fragment the heap and cause failure I allocate memory either statically or once only and then re-use. This is not feasible in C#.
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Sorry, I'll have to disagree with most of the above. 
I will admit that I am fairly new to C# and .NET!
But, I've been doing embedded systems and coding for over 20 years. I still remember using punched cards, paper tape, teletype terminals, etc.
Right now, as far as I know, there isn't C# compiler that will allow someone to do their embedded OS from scratch.
But, C# isn't magic. In fact, *I* would say that it's light years beyond the horrible job that was done with the C++ spec. IMHO, C++, represents just about everything that could be wrong with a language!
BTW: I've done YACC and other custom compilers/assemblers for micros/minis. Remember, back in the old days, that's often how things were done.
As for the "garbage collection" for C++, that's what gets into a gray area for micros. IMHO, there is no such thing as a "standard" C/C++ compiler. Yea, there's the BS standard. So what? It's vague in areas, and unless you do sizeof for everything, your code will break. Even then, compiler support differs.
So, the point is that for C# (or any other language), there's always "wiggle room" when it comes to how a company will do a compiler for an embedded micro. It would not be "unreasonable" if a compiler company added some other requirements or restrictions in the coding due to the C# intended use of garbage collection. For example, a compiler company may require an explicit call to the GC, and/or additional constructor/destructor coding.
Microsoft made Visual Studio C# output platform and processor independent. So, as long as you have enough memory, in theory, you can run your VS programs on any platform. Again, we get into the "embedded vs Windows" world of things. So, not all of the Windows calls makes sense in an embedded app.
IMHO, it will be hard for any language to compare to C for embedded apps. Sorry, IMHO, C makes far more sense in many way verses assembler. Or, IMHO, any other language. For one thing, C can be coded much faster and is far easier to understand. Also, C can be optimized. People suck at optimizing code. Now, it's very rare that a company has the time or desire to spend time on greatly optimizing code. Heck, I'd say that in 99.9999% of the code that is used by people, from the company's point of view, added features were far more important than speed or stability fixes. So, getting code done quickly often takes much higher priority than speed or compactness.
As for .NET in embedded applications, it's being done. I think a few people on here are involved in .NET on embedded systems.
http://www.embedded.com/news/embeddedindustry/197005919?_requestid=208524[^]
http://blogs.msdn.com/mikehall/archive/2007/02/05/net-microframework-and-windows-ce-what-s-the-difference.aspx[^]
As for me, I'll stick to C for my embedded systems, and I'll use C# for my Windows apps. IMHO, those are the best for each application.
modified on Saturday, August 1, 2009 10:47 PM
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Like you, I grew up with cards and tapes (and am soooo glad those days are over).
I have to disagree with you a bit though:
mustang86 wrote: People suck at optimizing code
Not always. Because the coder knows what hardware result they are trying to achieve (a square wave clock with data as applicable for example) they can often be considerably more efficient than a C compiler which can only optimize the higher level instructions, without regard for the algroithm. A mix of C and assembler is the best way IMHO, with assembler kept for when it is realy needed.
Embedded C++ can be a better choice than straight C, particularly if a project is going to get complex.
mustang86 wrote: So, getting code done quickly often takes much higher priority than speed or compactne
Depends on the company priorities: if you are going to ship hundreds of units, then yes. If you are going to ship hundreds of thousands of units, then hardware cost becomes the priority and the software has to work round it's limitations. Saving peanuts on hardware adds up fast when you ship enough!
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Hi im using VS2008 / SQLServer2005
Im using Linq, ive created my .dbml file - is there a tool in vs2008 that I can use to generate the DAL and/or BLL for basic CRUD operations or do I need to code it myself?
Many thanks,
Chas
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Yes and no. You can use the T4-enigne[^] in VS2k8 to generate the source-code, but then you'd probably have to write the templates yourself.
You can also research MyGeneration [^]or CodeSmith[^].
Good luck
I are Troll
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Sorry to have to post this guys and I believe this is the right group to target. Any help would be absolutely fantastic and obviously very much appreciated.....
I would say I am a beginner and have learnt from asp.net c sharp and SQL books. I have got to a stage where things make sense and like many of you will know it is pretty good place to be. Obviously I still have a long way to go hence I have thrown myself into a project which will I guess test many core technology.
Basically I am going to start work on a business system which logs information at each stage of a production process. The item gets picked up and ideally scanned in as it should already have a barcode (act as a primary id). When it gets to the premises it is booked in and then goes through each process of modification or testing (refurbishment) and then sent out again to a new origin when it is sold.
Ideally I want to use ASP.NET, C sharp and obviously SQL. Could you guys possibly give me some advice as to what areas of additional technology I should look into to implement it if there is anything? I trust barcode readers are universal and just plug the serial onto an excel spreadsheet which I could import into SQL database.
I read about things like Workflows, MVC's LINQ an WPF etc etc or is this not the way forward. I have a logical idea of how this thing should work but unclear as to what is out there if you see where I'm coming from.
I like the idea of running Sharepoint alongside this system but that comes later.
Any help will be awesome. Where to start? Just hope I haven't screwed myself!
Cheers for reading everyone.
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I am using a datagridview with an INSERT, DELETE and an UPDATE button. But whenever I run my form the error that I have stated above rises. Kindly help me to solve this problem.
<code>
string constr = "Server=PACE-BB95D506B2; Database=Dotnet67; uid=sa; pwd=123";
private void button1_Click(object sender, EventArgs e)
{
this.Close();
}
DataTable table = null;
SqlDataAdapter da = null;
private void LoadCashiers()
{
string query = "SELECT * FROM Cashier_2";
da = new SqlDataAdapter(query, constr);
table = new DataTable();
da.Fill(table);
dataGridView1.DataSource = table;
dataGridView1.Refresh();
SqlCommandBuilder b = new SqlCommandBuilder(da);
// The error rises in the line of code below
da.UpdateCommand = b.GetUpdateCommand();
}
private void ManageCashier_Load(object sender, EventArgs e)
{
LoadCashiers();
}
private void btnLoadCashiers_Click(object sender, EventArgs e)
{
LoadCashiers();
}
private void btnInsertCashier_Click(object sender, EventArgs e)
{
DALHelper helper = new DALHelper();
helper.InsertCashier(textBox1.Text);
LoadCashiers();
}
List<int>cashierIDsToDelete = new List<int>();
private void btnDelete_Click(object sender, EventArgs e)
{
foreach (DataGridViewRow row in dataGridView1.Rows)
{
bool deleteStatus = Convert.ToBoolean(row.Cells[0].Value);
int cashierID = Convert.ToInt32(row.Cells[1].Value);
if (deleteStatus)
{
row.Selected = true;
cashierIDsToDelete.Add(cashierID);
}
}
foreach (DataGridViewRow selectedRow in dataGridView1.SelectedRows)
{
dataGridView1.Rows.Remove(selectedRow);
}
DALHelper dal = new DALHelper();
dal.DeleteCashiers(cashierIDsToDelete);
cashierIDsToDelete.Clear();
// Load Cashiers from Database
LoadCashiers();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
da.Update(table);
MessageBox.Show("Update");
}
}
</code>
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The error means you don't have a primary key defined in your database table.
A primary key is mandatory if you want to use SqlCommandBuilder.
You must either define a primary key in the database table or write the code to build the insert, delete and update SQL commands by hand.
2+2=5 for very large amounts of 2
(always loved that one hehe!)
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i have developed a very simple application which contains a single win form and two classes.
i would like provide or show some text from those classess into my win textbox form.
how can i achieve it?
what I want excatly sames as "View Syn status" in MY SQL Replication.
i am trying to achieve from c#.
Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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Use
string s = "Hello";
textBox.Text = s; for a single line TextBox, or
string[] as = new string[n];
...
TextBox.Lines = as; for a multiline.
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my friend. i am asking about how can i access from other classess not from my win form.
from win form that is ok, but if i want to access it from other classes how can i access it and set the text to "hello" or something else?
Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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Set a public property of the form to set the text like
public string SetText
{
get
{
return textbox1.Text;
}
set
{
textbox1.Text = value;
}
}
And call it from your class by accessing it through the instance of the form on which the text box resides.
Ahsan Ullah
Senior Software Engineer
MCTS 2.0
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If I understand you correctly, you have a form with a textbox, and a separate class which does some work and is to display text in the textbox?
If yes, then either:
1) the class needs to be given the instance of the form.
or
2) the class needs to signal to the form that data is ready for display.
The first way is pretty trivial, the second is better practice.
Assuming:
myForm formMine = new myForm();
myClass classMine = new myClass();
In the first case, create a field in myClass:
public myForm formDisplayResult;
and assign it after the form and class creation:
myForm formMine = new myForm();
myClass classMine = new myClass();
classMine.formDisplayResult = formMine;
then access the textbox from your class:
formDisplayResult.tbResultsGoHere.Text = "Hello";
In the second case, it is a little more complex:
In myClass:
public partial class myClass
{
public delegate void ChangeHandler(object sender, EventArgs e);
public event ChangeHandler Changed;
protected virtual void OnChanged(EventArgs e)
{
ChangeHandler ch = Changed;
if (ch != null)
{
ch(this, e);
}
}
private void DoSomethingToChangeData()
{
OnChanged(null);
}
}
----- The asign to ch is in case the handler changes between null check
----- and exec.
----- (unlikely, but possible)
----- The null check is to ensure there is a handler. If not, better to
----- ignore it gracefully, than to rely on the thrown exception
----- (NullReferenceException)
In myForm:
myClass classMine = new myClass();
public myForm()
{
classMine.Change += new myClass.ChangeHandler(Changed);
}
private void Changed(object sender, EventArgs e)
{
tbResultsGoHere.Text = classMine.strResults;
}
It is easy really - you just have to get your head around it!
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thx alot, I really appreciate the second one, the first one might be bad habbit 
but one thing, does the class inherits from some thing, or its simply
public class className
{
//cnt and others
{
Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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Either. It makes no real difference for your example.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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As Henry said, it doesn't matter - any class (derived or not) can generate events.
Sorry for the late reply, I was busy making a bulk supply of meatballs...
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Good answer!
For future reference, there is no need to create a delegate if using 2.0 or above.
public event ChangeHandler Changed;
can be written as
public event EventHandler Changed;
If custom event args are needed, there is a generic event handler
public event EventHandler<ChangedEventArgs> Changed;
Yay, no more delegate writing when using events 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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Thanks!
I didn't know that, I'll give it a try sometime soon. Would be nice to simplify delegate / handler construction a bit...
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Well, i think i need more help
for (int i=0; i<count; i++)
{
="" result="i.ToString();
" display="" the="" variable="" contents="" into="" win="" form="" text="" box?
}
how="" can="" i="" send="" content="" winform="" box.=""
<div="" class="ForumSig">Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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I think you mean that your class generates a sequence of results, rather than a single result?
If so, then I would output them to a list and signal to the higher level that there were available.
Specifically, I would set up a queue in your class:
public Queue<string> qsOutputResults = new Queue<string>(100);
(Always create a queue with a minimum size or it gets extended the first time you use it)
Then when your results are available:
qsOutputResults.Enqueue(i.ToString());
OnChanged(null);
This adds the results to the queue and signals the results are ready.
In your form:
private void Changed(object sender, EventArgs e)
{
while (classMine.qsOutputResults.Count > 0)
{
tbResultsGoHere.AppendText(classMine.qsOutputResults.Dequeue());
}
}
Using the queue means they come off in the same order they went on.
If your form is too busy, they will just wait on the queue until you are ready.
You can replace the string with whatever is sensible for your results (of course).
You probably don't want to AppendText (it depends on your app) it was just for example.
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thx dude, that is really appreciated.
the thing which i got concern with, My messsage will not increase than 1000 lines, in each 1000 lines i will clear the textbox contents,
well do i need to use queue for my case, or i should use some other collection for good performance? and if the size of queue increase will it affect the speed and performance of computer?
Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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The performance of the queue should be pretty good anyway (except when the size is increased, at which point a new structure has to be created and populated with a copy of the original). Just a case of setting the initial size to a reasonable limit.
If you use another collection (a List<T> for example) then you would have to take care of the FIFO ordering which a Queue guarantees. If you are displaying the latest results (as you seem to) then why re-invent the wheel?
[edit]Removed word "not" from "should not be pretty good" above[/edit]
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thx alot, you helped me alot, thanks again
Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan
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