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I remember when you had to change the chain to change the font!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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What kind of printer is it? A dot-matrix? If that's the case, then you can force it to print the default font if you add it to Windows as a "Generic Text" printer, instead of using the higher level driver.
The difficult we do right away...
...the impossible takes slightly longer.
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You have a solution in mind that is unlikely to work and you are trying to figure out how to make it work.
Instead you should define what the problem is and then ask about possible solutions. And provide sufficient detail about the problem.
As noted by the other replies there are many possible solutions because there are many possible problems.
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by using the default drawing method i tried to print through usb and it is printing also
example:
Font f1;
f1 = new Font("Calibri", 14, FontStyle.Regular, GraphicsUnit.World);
e.Graphics.DrawString(pLine, f1, Brushes.Black, new Point(-90, 30));
now here i am able to print in all the fonts which is available in msword
but when i am printing through serial port(com port) the font is totally different
now i want to print in the same font which it is using when i am printing through serial port.how do i get that font that's my question
printer used : essae thermal reciept printer
when i am doing selftest of printer it is printing
default ASCII Font : FONTA
Default code page : page0
now i hope so my question is clear...
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There is no way to determine that and it will not help you as there is likely no equivalent font in Windows.
What do you think knowing which font the printer is using is going to do for you?
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In Microsoft Visual Studio Enterprise 2015 I have created the simplest Windows Forms Application (.NET Framework 4.5.2.):
On the main Form1 there's a button1. When you press it the Form2 opens and closes immediately and loops with this Form2 open and closure.
On Windows 10 Task Manager you will see the memory usage increasing . I expect the memory to be released instead . Obviously after some time the memory usage will be huge and cause problems.
It's a test that anyone can do. How can this be possible? Even if I decrease the loop and wait for the cycle to finish, the memory is not released.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
int loop = 100000;
for (int i = 0; i < loop; i++)
{
using (Form2 a = new Form2())
{
a.ShowDialog(this);
}
}
}
}
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e)
{
Close();
}
}
Mr. Burns
Montgomery Burns
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No, the memory is not released automatically - the heap will be freed and recycled when the Garbage Collector runs and detects the unreferenced items. This may not happen for some time, but even when it does occur, the amount of memory shown in the Task manager will probably not decrease: the framework doesn't release memory back to the OS automatically when it compacts the heap.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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When run for a long time, the application will make the whole system stuck. How would you solve this?
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No, it won't - at some point the GC will run and compact the heap, releasing the memory for other uses within the app. But the framework doesn;t release the allocated memory back to Windows unless Windows starts to run low on resources - at which point the GC happily deallocates it back to the OS. The value in the Task Manager just indicates how much the framework has grabbed so far, which is not the same as the amount of memory your app is using at all!
To accurately investigate your app memory usage, you would need to use a profiler, such as dotMemory[^] or Redgate ANTS[^]
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Quote: No, it won't
It will and it's been verified. I have checked it also with Redgate ANTS profiler, the memory is never freed. The operating system interface slows down and sometimes OutOfMemoryException appears.
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Ahem,
Quote: Because a form displayed as a dialog box is hidden instead of closed, you must call the Dispose method of the form when the form is no longer needed by your application.
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He creates it in a using block, so Dispose should be called automatically.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I've been looking at code way too long. I completely missed the using and just expected to see the Dispose somewhere after the ShowDialog(). 
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I know the feeling - I keep reading what I meant to write... 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Read the documentation on ShowDialog[^]. If you show a form using ShowDialog, you are responsible for Disposing the form when you're done with. Failure to do so will result in memory and resource leaks.
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Is this true even if you call Close() in the AcceptButton and the CancelButton handlers?
The difficult we do right away...
...the impossible takes slightly longer.
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Yep. the form is not really closed but is hidden when you return from ShowDialog.
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As you can see from my code the ShowDialog is enclosed in using block. This forces the dialog to be disposed by forcing the Dispose method to be called.
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Having a regex with several matched groups I would like to change the groups value before expanding the replace-string. For example, if the group $1 contains "abc" i try to get an replacement of "axc". Because the change to be applied depends on the group's position I need to do it on the group's value. Is there any chance to solve it whithout manually expanding the replace-string? If not, for manually expanding my approach would look like:
get all groups an their names
sort the names in descending length
foreach name check if replace.contains(${name}) [for groups like ${1} also check $1; for named groups also check the numbered Version]
and if yes, replace with the modified value of the group.
Do I overlook something? Or is there a smarter way?
Thanks for any suggestion.
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It's not entirely clear what you're trying to do. An example of the input and expected output would probably help.
But if you're just trying to inject some logic into the replacement, you probably want to use the Replace overload which takes a MatchEvaluator delegate:
Replace Method | Microsoft Docs[^]
string text = "four score and seven years ago";
Regex rx = new Regex(@"\w+");
string result = rx.Replace(text, match =>
{
string x = match.Value;
if (char.IsLower(x[0]))
{
x = char.ToUpper(x[0]) + x.Substring(1, x.Length - 1);
}
return x;
});
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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My project is a asp.net C# web application.
I am running code that exports several pdfs and excel files at one time. I don't believe this issue is anything to do with that though.
I added an updatepanel that I am using to prompt the user to continue on to the next set of files to export.
Everything works perfectly on my local server but when I publish it the my development server and try to click a button it looks for a local path. There is no where in my code where I have anything hard coded to a local path, I use Server.MapPath for everything, here is what it's looking for:
'C:\Users\User\Desktop\TCS - WinHost (NEW GOOD)\Avenue\Equipment\Invoice.aspx'
Why would my development server look for a local path? How would it even know to look for this local path? Thank you advance for any help anyone can offer.
Here is the full error screen:
Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Avenue.Equipment.Invoice.btncontinue_Click(Object sender, EventArgs e) in C:\Users\User\Desktop\TCS - WinHost (NEW GOOD)\Avenue\Equipment\Invoice.aspx.cs:1284
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9692746
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3562
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Look at the error message:
Quote: Object reference not set to an instance of an object.
It's not complaining about a path, it's complaining about an null reference.
This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.
Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.
We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!
Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
Look at your stack trace, and it's in your Invoice.ASPX file on line 1284 - in VS, you can just type CTRL+G, enter 1284 ENTER and it'll take you right to the line.
Put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.
But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Thank you for your reply, and I definitely understand what "Object reference not set to an instance of an object." means.
And line 1284 is where at the btncontinue_Click event is.
The problem as I see it is this line in the stack trace:
Quote: NullReferenceException: Object reference not set to an instance of an object.]
Avenue.Equipment.Invoice.btncontinue_Click(Object sender, EventArgs e) in C:\Users\User\Desktop\TCS - WinHost (NEW GOOD)\Avenue\Equipment\Invoice.aspx.cs:1284
Like I said everything works fine on my local server.
This error is from my production server - of course the production server wouldn't be able to find something from "C:\Users\User\Desktop\TCS - WinHost (NEW GOOD)\Avenue\Equipment\Invoice.aspx.cs" and return a null - that makes prefect sense.
What I don't get is why my production server is trying to find something on the local host server, it's looking in the wrong place.
And I just realized every time I meant to say "production server" in my previous post I said "development server"...
Do you get what I mean now? Sorry for the confusion.
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