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Use a try-catch-block inside your DoWork method.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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Wow...Holy crap I never thought of that.....I was reading this article http://www.developerdotstar.com/community/node/671/print and it said not to use a try/catch block with the backgroundworker....but I just realized....they meant "Around the backgroundworker" not in the doWork method....Wow....Thank You
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My pleasure 
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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I was actually going to say..." I am an idiot for not thinking that " but I read your sig.... and decided not too.  Thanks again
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I don`t t know how to write some information to file descrition , the class FileVesion just can get the inforamtion .
who can help me ?
thanks!
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hi i have a small question.
how is it posible to abort an thread, inside the thread.
so what does i whant
<br />
while(true)<br />
{<br />
Thread thread = new Thread(new ThreadStart(myclass.functioninmyclass));<br />
thread.start();<br />
}<br />
<br />
public void functioninmyclass()<br />
{<br />
<br />
}<br />
<br />
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Hello,
You could use "return;" to end the method, I think the thread will automatically stop after that.
All the best,
Martin
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hi,
You can try this:
<br />
if (thread.IsAlive)<br />
{<br />
thread.Abort();<br />
}
all the best
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When the top-level method of your thread's code comes to an end (by returning or reaching
end of method), the thread exits.
You really should try to let your thread finish up by itself, so use return, and let
all using blocks and finally blocks do the cleanup work.
In general Thread.Abort is not OK since that does not take care of any resources, locks,
etc that your thread possesses.
Luc Pattyn
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HI,
I must implement a millesimale chronometer in C# on my pda… and I have studied the 3 types of timer inside framework .NET (the System.Windows.Forms.Timer, System.Timer (NOT AVAILABLE IN .NET CF) and System.Threading.Timer.
I have begun to test, obtaining strange turns out. The good old API function (GetTickCount) was much simple one to use and in little instructions, associating at the timer with interval of 1 millisecond, worked correctly, but now something does not return and it turns out obtained are not those obtained hopes to you.
Help me please ..
Alex
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Honestly, I didn't get what your problem is and I think understanding your post is hard for everyone else too (no offense intended). Maybe you can rephrase your problem a bit to clear things up. Furthermore, it would be helpful to see the code in question.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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I must develop a millesimale chronometer using the System.Threading.Timer or the System.Windows.Forms.Timer but I do not succeed to show the millesimi elapsed. In VB6 I have used the GetTickCount function, but in “.NET COMPACT FRAMEWORK” it is not supported.
How I can make?
Alex
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Try DateTime.Now.Ticks.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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I Try this ..
-- Example C#:
long lInit, lDiff;
//Start function
lInit = DateTime.Now.Ticks;
//Event timer (interval 1 millisecond)
lDiff = (DateTime.Now.Ticks - lInit) / 1000;
But the result is different from example below:
-- Example VB6:
//Start function
lInit = GetTickCount()
//Event timer (interval 1 millisecond)
lDiff = (GetTickCount() - lInit) / 1000
I must view any millisecond elapsed on interval ...
Alex
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The Ticks property returns the number of 100-Nanosecond-Intervals since a specific date, so you should divide by 10000 I think.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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I have tried but it does not work correctly…
Alex
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AlexB47 wrote: does not work correctly…
What does that mean? How does the calculation results differ?
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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every elapsed time (1 millisecond) show this ...
//1 second elapsed
10000
//another second elapsed
20000
//another second elapsed ..
30000
...
Alex
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Where is the big problem? The values look quite good with the exception that obviously the unit doesn't fit. So simply increase the divisor (multiply with 10) in your calculation.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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The answers is System.Environment.TickCount .. 
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You may get diasppointed here: all timing information has some resolution and
some accuracy, and in general accuracy is much worse than resolution may suggest.
Try the following code on your system:
public override void Run() {
long t1=DateTime.Now.Ticks;
int count=0;
int tries=0;
while(count<20) {
tries++;
long t2=DateTime.Now.Ticks;
long diff=t2-t1;
if (diff!=0) {
log("tries="+tries+" t1="+t1+" t2="+t2+" diff="+(t2-t1));
count++;
t1=t2;
}
}
}
You will notice that most of the time diff=0 (suggesting a really fast machine!)
and sometimes diff is something else, typically equal to (or a multiple of)
the real smallest time step you can measure in this way (on my PC it is 156250,
which corresponds to 1/64 second). So dont expect to construct a millisecond chrono
out of it.
What you do need is good old PInvoke to the PerformanceCounter stuff.
Luc Pattyn
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We proceed for small steps… why in .NET 2.0 framework an instruction as under brought back SHOW the millisecond and in framework .NET 2.0 CF (same function, identical code) the millisecond do not SHOW? I have tried also with the Application.DoEvents but nothing ... why?
Es..
private long m_lInitialTick;
private void StartCrono()
{
m_lInitialTick = DateTime.Now.Ticks;
timerTmp.Interval = 1;
timerTmp.Enabled = true;
}
private void StopCrono()
{
timerTmp.Enabled = false;
}
private void timerTmp_Tick(object sender, EventArgs e)
{
label.Text = Convert.ToString((DateTime.Now.Ticks - m_lInitialTick) / 10000) ;
}
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You should read my previous post again,
then try my code snippet on your system.
It would be completely wrong to expect DateTime.Ticks to increment by 1,
on my system it increments by 156250, and maybe on a portable system
it increments by 10000000 (maybe there is only one clock tick per second "to preserve power").
There is nothing in the MSDN help that specifies one or the other; this is unfortunate.
If you have any kind of performance counter available (maybe the one in .NET 2.0,
otherwise the native Win32 one), then that one will give you the best results.
I do not know whether .NET Compact is capable of handling sub-second intervals, I hope it does.
Luc Pattyn
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Dear Sirs,
I use Visual Studio .NET 2005 (Framework 2.0)
I use Tree-Tier architecture approach in my project, and I use NHibernate.
I get data in the Data Layer from database and initialize object.
In View Layer;
First of all I determine ValueMember and DisplayMember for ComboBox
comboBox1.ValueMember = "id";
comboBox1.DisplayMember = "name";
And determine DataSource for ComboBox. I get data in IList fromat from Data Layer.
comboBox1.DataSource = XYZ; //XYZ is a IList
Now, ComboBox list name, its OK. My problem is I get id when I select any name from combobox.
**FOR EXAMPLE:
TEST_TABLE
ID Name Surname
-- ---- -------
3 Jack Black
4 Marry Green
5 John Wall
I fill combobox like this;
comboBox1.ValueMember = "id";
comboBox1.DisplayMember = "name";
comboBox1.DataSource = obj; //obj is IList
So, combobox filled and show "Name"s.
How can I get selected value's ID from combobox.
For example, if I select "Marry" on the combobox, how can I get "4"?
Note: This ways not solve my problem.
int i = int.Parse(comboBox1.SelectedValue.ToString()); //ERROR: Input string was not in a correct format.
Int32 i = Convert.ToInt32(comboBox1.SelectedValue); //ERROR: Unable to cast object of type 'NAMESPACE.CLASSNAME' to type 'System.IConvertible'.
Int32 i = (Int32)comboBox1.SelectedValue; //ERROR: Specified cast is not valid.
int i = (int)comboBox1.SelectedValue; //ERROR: Specified cast is not valid.
string test = (string)comboBox1.SelectedValue; //ERROR: Unable to cast object of type 'NAMESPACE.CLASSNAME' to type 'System.String'.
string test = comboBox1.SelectedItem.ToString(); //RETURN: 'NAMESPACE.CLASSNAME'
DataRowView o = (DataRowView)comboBox1.SelectedValue; //ERROR: Unable to cast object of type 'NAMESPACE.CLASSNAME' to type 'System.Data.DataRowView'.
object o = comboBox1.SelectedValue;
int i = Convert.ToInt32(o); //Unable to cast object of type 'NAMESPACE.CLASSNAME' to type 'System.IConvertible'.
Best Regards...
-- modified at 4:21 Friday 26th January, 2007
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mmmh...
The DataSource of your ComboBox has which Type?
An ArrayList with Class-Instances who represent via there Members ( via Get&Set ) the DataBase-Elements?
Or is it a DataTable ?
In VS.NET 2003 it exists a CurrencyManager. That's a "pointer" on a DataTable, which is pointing on the current Row. I don't think that a ChangeSelection of the ComboBox also changes the "current marked Record-Row" ... but it's a possibility to check if you find no way to resolve it.
Another Possibility is to make a relation between your ComboBox and your IList-Objekt.
If the indices of each are the same, you can get the SelectedIndex from the ComboBox:
In this case "1" .. than you go to the IList at index "1" and extract the "ID-Field"
I hope this helps you maybe.
Greetings
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