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Thanks a lot. . .
Proud To Be an Indian
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int? num = null;
The meaning of the int? is represent the num is nothing there no mermory alocatin for the num the space of the num is empty.It is mainy used for DATA Base activity.
Continue...
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This is not true at all. The memory is allocated, and the memory for the wrapper generic class that int? is a shortcut to, is also allocated. It's simply set up so that the initial value is null, which means that whatever value the int has ( an int cannot be null ), the wrapper class will not expose it, because it regards the value to be null intead.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Christian Graus wrote: The memory is allocated, and the memory for the wrapper generic class that int? is a shortcut to, is also allocated
SO you mean to say when we write
int?num; // allocates 4 bytes of memory but requires an initial assignment.
But "int?" is a "SHORTCUT to WHAT ???" is it System.Nullable<int> variable
Proud To Be an Indian
modified on Tuesday, April 8, 2008 4:32 AM
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vivekphlp wrote: But Graus "int?" is a "SHORTCUT to WHAT ???" is it System.Nullable<int> variable
Yes.
BTW, referring to people by their surname is considered rude in the West. Just saying....
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Sorry If i had hurted U. . . 
Proud To Be an Indian
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Not at all, like I said I'm just saying. I understand that it's just a cultural difference between our countries, but, I thought it worth pointing out, because someone else might be offended.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I want to create a scheduled service application in C# which runs after some period of time..
Basically it should be any program which executes and then sleeps and then again wakes up and executes after period of time..
Can anyone guide me over this?
Som
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Hope this helps[^]
better one[^]
Until you realize this message has nothing to say, its too late to stop reading
modified on Tuesday, April 8, 2008 1:09 AM
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I think I didnt write my post properly..
I dont want to make a windows service.. Since that would be too high on performance.. I want to make a kind of windows scheduler which executes some other program at specified intervals of time (say once in every 3 hours or once weekly)..
I know this may be achieved by adding a task to windows scheduler..
So how can I add a task to the windows scheduler programaticaly using C# so that it may run at specified intervals of time??
Any help would be appreciated..
Som
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The service applicaion will help you create the scheduled applicaion.
First create service applicaiton. This appliciaon relate with your applciaon.Then you can solve the probelm.
Continue...
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C#, How to check an object to see if it is a numeric value?
something like this?
if (IsNumeric(intnumber))
{
return intnumber
}
else
{
return 0
}
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int iValue<br />
bool isInteger = int.tryparse(yourObject, out iValue);
Until you realize this message has nothing to say, its too late to stop reading
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Can we put it an if statement?
If (isNumeric(myObject)
{
return myObject
}
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dougins wrote: If (isNumeric(myObject)
Where did isNumeric came from?
If you are talking about Microsoft.VisualBasic.Information.IsNumeric(object) then cant use it.
Until you realize this message has nothing to say, its too late to stop reading
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The only place that IsNumeric exists, is for a char. The TryParse methods take a string, so if you have an object, you need this:
string testVal = myObject.ToString();
double d;
if (double.TryParse(testVal, out d))
{
// I used double because 23234.545 is a number and int.TryParse won't accept it
// I assume double.TryParse can parse a whole number.
}
The other way to do it is
bool isNumeric = true;
foreach(char c in myObject.ToString())
{
if (!char.IsNumber(c))
{
isNumeric = false;
break;
}
}
But this is more code, and again, it depends on if you care about decimals, writing a method to check decimals is even more messy ( you must accept one and only one decimal, and you need to respect culture, some cultures use , as a decimal point.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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object obj = 10;
string str =Convert.ToString(obj);
Console.WriteLine(char.IsNumber(str, 0));
Console.Read();
Hi friend u can use this functionality and solve the issue.
Continue...
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Wow - after two correct answers, you offer an incorrect one. Brilliant. This will work *sometimes*, but is far from foolproof.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Assume obj is some object.
To check if that is a number, you could use:
bool isNumber = Regex.IsMatch(obj.ToString(), @"^(\-|\+)?\d+[.]?\d*$");
SkyWalker
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It depends on what you are actually doing.
Why would someone put that check inside a constant looping?
SkyWalker
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Assuming you had something like:
int number = 5;
...
object obj = number;
or
object obj = 5;
Then you could just use:
if(obj.GetType() == typeof(Int32) {
}
or even simpler still:
if(obj is Int32)
You may also want to check for Int16 and Int64 (or you can check for short, int and long, oh yeah and there's also float and double to check for as well. And the unsigned versions of the types)
My current favourite word is: Nipple!
-SK Genius
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Hi, i'm writing a program about copy files from one place to other place. When the copy process start, it will shows up a form and tells user what file are being copied and there is a button to allow the user to stop the process. My problem is i cannot make the "stop" button works.The program code is like this:
======Copy Form======
private void StopButton_Click(object sender, EventArgs e)
{
frmTest.Stopcopying = true;
return;
}
=======Main form(frmtest) ========================
....
public static bool Stopcopying = false;
...
public static void copyDirectory(string Src, string Dst) {
String[] Files;
fmCopying.StartPosition.Equals("Center");
if (Dst[Dst.Length - 1] != Path.DirectorySeparatorChar)
Dst += Path.DirectorySeparatorChar;
if (!Directory.Exists(Dst)) Directory.CreateDirectory(Dst);
Files = Directory.GetFileSystemEntries(Src);
// int[] result = Array.FindAll(Files, delegate(int i){}
frmCopying fmCopying1 = new frmCopying();
fmCopying1.Show();
foreach (string Element in Files)
{
fmCopying1.Refresh();
// Sub directories
if (Directory.Exists(Element)){
if (frmTest.Stopcopying == true)
{
fmCopying1.Close();
return;
}
copyDirectory(Element, Dst + Path.GetFileName(Element));
fmCopying1.Refresh();
fmCopying1.lblCopying.Text =Element;
fmCopying1.lblCopying2.Text = Dst + Path.GetFileName(Element);
fmCopying1.Refresh();
} // Files in directory
else
{
if (frmTest.Stopcopying == true)
{
fmCopying1.Close();
return;
}
File.Copy(Element, Dst + Path.GetFileName(Element), true);
fmCopying1.Refresh();
fmCopying1.lblCopying.Text =Element;
fmCopying1.lblCopying2.Text = Dst + Path.GetFileName(Element);
fmCopying1.Refresh();
}
}
fmCopying1.Close();
}
....
try
{
if (frmTest.Stopcopying == true) throw null;
copyDirectory(@path, @mapto);
} catch (Exception err)
{
{
string errrr = "Error: " + err.Message;
MessageBox.Show(this, errrr, "", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
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If i click on the stop button the window will freeze and the copy process don't stop..
My though in the code maynot be the best way of doing it, any ideas are welcome, many thanks for your help 
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Hi,
if you call the copyDirectory method on the GUI thread (say inside a button click handler,
or a form load handler), then the GUI will be blocked as long as the copy takes, hence
the stop button will not work during that time, making it useless.
the right solution is to perform the copyDirectory on a separate thread, which gets
launched by the start button or the form load handlers, and which does not run on the
GUI thread, so you can move, resize, etc while the copy is going on; and you now can
use the stop button.
Warning: if you need to update the GUI (say show the filename currently being copied)
you would need Control.InvokeRequired and Control.Invoke to do so.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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