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Greetings:
I am a relatively new C# programmer and I have written a naive little utility which performs a task within a loop. This program is simple and the loop executes inside a routine belonging to the main form. The task that the loop performs does take some time though, maybe a few minutes, depending on various settings.
What I wanted, and this is the naive part, was to put some controls on the main form that update the user as to the status of the process. These are mostly just text boxes. When I want to update one or all of the text controls, I write the new string to the control's "Text" property.
What I have found though is that the form sometimes updates, but can go into this strange state of limbo where it simply stops updating or sometimes even goes blank. The main loop is still executing and the form will come back to life once the loop is finished. But I wanted the form to update continually throughout the process. I have also found that the form will update itself at first but if I click the mouse pointer on it or attempt to move the form on the display, then it freezes instantly and does not come back until the loop is finished.
I am an experienced MFC programmer and I know that this kind of thing happens if you fail to service the "message pump" from within loops of this sort. Have I missed something similar here? Or is this little utility simply an architectural accident-waiting-to-happen?
If the later is true, then what must I do to implement a long looping process that provides continually refreshed status to the user interface? Can you point me to books or articles?
Thanks in advance to anyone that responds
Mark
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Do the loop in a new Thread and from there call yourcontrol.BeginInvoke() to update its contents.
This and this might help you 
regards
modified 12-Sep-18 21:01pm.
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Thank you. That worked.
M. 
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Hi all:
I am doing a windows form application. I need to some textboxes which can only be inserted numbers like prices. Is there any existing component in windows application of C# please? What's the best way of achieving this please?
Thanks alot
Asura
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Process the KeyDown event and check, if it's a number:
try
{
int number = int.Parse(textbox.Text);
}
catch (Exception e)
{
}
You could also use a MaskedEditBox (or how that is called, I haven't used this one yet)
regards
modified 12-Sep-18 21:01pm.
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Greeeg is definitely right, but I'd prefer a slightly different way than using exception. Here's the code:
<br />
private void AmountBox_KeyPress(object sender, KeyPressEventArgs e)<br />
{<br />
switch (e.KeyChar)<br />
{<br />
case '0':<br />
break;<br />
case '1':<br />
break;<br />
case '2':<br />
break;<br />
case '3':<br />
break;<br />
case '4':<br />
break;<br />
case '5':<br />
break;<br />
case '6':<br />
break;<br />
case '7':<br />
break;<br />
case '8':<br />
break;<br />
case '9':<br />
break;<br />
default:<br />
e.Handled = true;<br />
break;<br />
}<br />
}
Setting Handled to true prevents the input from being processed further and that is exactly what you want for anything else than numbers. BTW: This is a function for the KeyPress event.
Greetings
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This is a better way still. Using execeptions is not a good idea.
private void AmountBox_KeyPress(object sender, KeyPressEventArgs e)
{
if(!char.IsNumber(e.KeyChar))
e.Handled = true;
}
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if want to genarating report by using crytal report with microsoft access office,
got any ppl know how the coding writes?
my friend using database by microsoft sql can genarating report, but in microsoft access office is cannot.
y like that one?
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got ppl know how to retrieve data from the cookie, by diffrence user get diffrence color??
private void btnselectedt_Click(object sender, System.EventArgs e)
{
DateTime dt = DateTime.Now;
TimeSpan ts = new TimeSpan(30,0,0,0);
HttpCookie mybg = new HttpCookie("bg");
mybg.Value = Convert.ToString(Session["assgroupID"]); //dotnot right or wrong, it try to bring ID
mybg.Value = ddlcolor.SelectedItem.Text;
mybg.Expires = dt+ts;
Response.Cookies.Add(mybg);
}
-------------------------------------------------------------------------------------------------------------------
string getbg()
{
return Request.Cookies["bg"].Value;
}
-------------------------------------------------------------------------------------------------------------------
...
...
if only can display in current page, but after logout already cannot retrieve form cookie. So, when login again cannot display
the bgcolor color that selected last time.
pls helping me what kind of problem on this coding, thank.
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Lol. What is an "assgroup"? 
What is it that you have in the session variable? Is it something that can be interpreted as a color?
Have you examined the html code that is produced, so see what value you actually get?
---
b { font-weight: normal; }
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i use session to bring associatin group ID and store in to cookie, may be correct maybe wrong, becuase i also not sure
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Hello,
I have an app that I use to get poll for the hostnames on my local network.
I use this method to get the information.
System.Net.IPHostEntry hostEntry = System.Net.Dns.GetHostByAddress(address);
The problem is that when GetHostByAddress(...) fails because there is no machine at a given IP address, it throws an exception that takes a long time (a few seconds).
Is there a faster method to call?
Is there a method that does the same thing, but sets an error value instead of throws an exception when a bad thing occurs?
Is there some kind of timeout setting that I can set to like 20 milliseconds? (I can be assured of always being on a lan with a fast response)
I use a whole bunch of threads to speed up the application, which makes the wait more tolerable, but it still takes way too long for my taste.
Is there a better method to use in .Net 2.0
Thanks.
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Use the asynchronous BeginGetHostEntry method, it will not block.
(You can also use BeginGetHostByName, but it's marked as obsolete in .NET 2.0)
regards
modified 12-Sep-18 21:01pm.
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Hi all, sometimes I need to raname e VS 2005 c# project but I receive several errors. Wich is the correct procedure to safely raname the project name, project directories an so on without having problems ?
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excuzme.
in the name of god
hi.
c++ is famous for speed and running.
for graphic programing and game in next year c++ or c#?
how can i increase the speed of c# to speed of c++?
how dose not c# in commercial game?
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ammoh - Microsoft is still actively improving the performance of the C# language and libraries. For information on using C# in scientific computing, check out this MSDN Magazine article[^]. The "Related Articles" section at the bottom of the page also provides some good advice on this topic. It's not too hard to relate these scientific computing concepts to gaming.
Good luck!
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When Microsoft delved into writing LongHorn, the CLR team was given a directive by Bill. Make the CLR and C# run at C++-compiled speeds. This is probably a part of why it is slowly coming out. It is an undertaking, but the JIT now builds your IL AND optimizes the execution! I think you will find both languages coming out equal in speed.
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hi
i have an app in which i can drop objects onto a form and move them, it consists of graphics (lines), i am using double buffering to avoid filckering in the parent control which is a panel,but when i add controls to this panel dyanamically, the double buffering effect is not there, i move all lines conneted to a control when the control is moved , at this time flickering occurs, please help.
Sameer Sood
Microsoft Student partner
NIT Durgapur,india
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How can i record sound in an applicaton in vs2005?
rzvme
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Search the articles, there are several dealing with the topic.
Regards,
mav
--
Black holes are the places where God divided by 0...
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Hi,
I wrote my user control to have my transparent image button using Windows forms.
For transparency, I need this:
protected override CreateParams CreateParams<br />
{<br />
get<br />
{<br />
CreateParams cp = base.CreateParams;<br />
cp.ExStyle |= 0x00000020;<br />
return cp;<br />
}<br />
}
and this:
protected override void OnInvalidated(InvalidateEventArgs e)<br />
{<br />
<br />
Transparenz zu erhalten<br />
this.SuspendLayout();<br />
this.Width--;<br />
this.Width++;<br />
this.ResumeLayout();<br />
<br />
base.OnInvalidated(e);<br />
}
and this:
protected override void OnPaintBackground(PaintEventArgs pevent)<br />
{<br />
}
It's working fine, but it flickers a bit. If there wouldn't be the overridden createParams, I could use double buffering. But, in this case transparency wouldn't work.
Do you know a way to have transparency and double buffering?
Regards,
Andreas
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I have a listbox that a user populates. I want to only allow single spacing to be added to the listbox.
CSharpian
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You can use a regular expression with the pattern " {2,}" to replace multiple spaces with a single space.
---
b { font-weight: normal; }
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Thanks alot  That was a huge help. This is how I used it.
str1 = " spaces morespaces ";
str2= Regex.Replace(str1," {2,}", " ");
I noticed that it replaced every occurence of a mulitple space with a single space even at the beginning and the end. So I used:
str2 = Regex.Replace(str2,@"^\s*(.*?)\s*$", "$1");
to trim all of the leading and trailing spaces
Result:
"spaces morespaces"
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