Autocomplete Textbox TextChanged Event Accessviolation Exception
I want to create autocomplete text which is when user typed number, the user typed text+fixed text appears as autocomplete text. So I create autocompleteStringCollection in textchanged event. But it gives me AccessViolationException:
System.AccessViolationException HResult=0x80004003
Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source= Stack trace:
Is there any suggestion?
Here is my code!!!!
private void textbox_TextChanged(object sender,EventsArgs e)
{
AutocompleteStringCollection a=new AutocompleteStringCollection();
if(textbox.Text.Length!=0)
{
a.AddRange(new String{textbox.Text+"greater than",
textbox.Text+"greater than equal"});
}
textbox.AutocompleteCustomSource=a;
}
c#
edited Nov 26 '18 at 0:51
John
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
|
show 2 more comments
I want to create autocomplete text which is when user typed number, the user typed text+fixed text appears as autocomplete text. So I create autocompleteStringCollection in textchanged event. But it gives me AccessViolationException:
System.AccessViolationException HResult=0x80004003
Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source= Stack trace:
Is there any suggestion?
Here is my code!!!!
private void textbox_TextChanged(object sender,EventsArgs e)
{
AutocompleteStringCollection a=new AutocompleteStringCollection();
if(textbox.Text.Length!=0)
{
a.AddRange(new String{textbox.Text+"greater than",
textbox.Text+"greater than equal"});
}
textbox.AutocompleteCustomSource=a;
}
c#
edited Nov 26 '18 at 0:51
John
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
1
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34
|
show 2 more comments
I want to create autocomplete text which is when user typed number, the user typed text+fixed text appears as autocomplete text. So I create autocompleteStringCollection in textchanged event. But it gives me AccessViolationException:
System.AccessViolationException HResult=0x80004003
Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source= Stack trace:
Is there any suggestion?
Here is my code!!!!
private void textbox_TextChanged(object sender,EventsArgs e)
{
AutocompleteStringCollection a=new AutocompleteStringCollection();
if(textbox.Text.Length!=0)
{
a.AddRange(new String{textbox.Text+"greater than",
textbox.Text+"greater than equal"});
}
textbox.AutocompleteCustomSource=a;
}
c#
edited Nov 26 '18 at 0:51
John
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
I want to create autocomplete text which is when user typed number, the user typed text+fixed text appears as autocomplete text. So I create autocompleteStringCollection in textchanged event. But it gives me AccessViolationException:
System.AccessViolationException HResult=0x80004003
Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source= Stack trace:
Is there any suggestion?
Here is my code!!!!
private void textbox_TextChanged(object sender,EventsArgs e)
{
AutocompleteStringCollection a=new AutocompleteStringCollection();
if(textbox.Text.Length!=0)
{
a.AddRange(new String{textbox.Text+"greater than",
textbox.Text+"greater than equal"});
}
textbox.AutocompleteCustomSource=a;
}
c#
c#
edited Nov 26 '18 at 0:51
John
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
edited Nov 26 '18 at 0:51
John
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
edited Nov 26 '18 at 0:51
John
12.9k32242
edited Nov 26 '18 at 0:51
John
12.9k32242
edited Nov 26 '18 at 0:51
John
12.9k32242
12.9k32242
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
asked Nov 24 '18 at 14:24
Zuzan Ko Ko HtetZuzan Ko Ko Htet
62
62
1
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34
|
show 2 more comments
1
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34
1
1
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34
|
show 2 more comments
1 Answer
1
active
oldest
votes
Lacking any actuall code to debug, all I can give you is the gist.
AccessViolationException is part of the OS Memory Protection. AV Exceptions usually requires someone handling naked pointers and bleeping stuff up, wich is scarily easy to do.
You usually do not get them in .NET. The designers went out of their way to prevent you from needing to handle naked pointers. There is still a few possible causes:
- You are using unmanaged code - in particular PINvoke - or unsafe code and thus handle naked pointers
- You swallow fatal exceptions. After you do that, you get more and less undstandable followup eceptions. This one is just one option. I advise reading these two articles to get the proper handling: https://blogs.msdn.microsoft.com/ericlippert/2008/09/10/vexing-exceptions/ https://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET
- Binary damage to the .NET libraries
- 3rd party interference, particular virus scanner. I remember 3-5 years ago we had such an issue with Windows Forms and AVG. And I can remember someone else having similar issues just last week or so...
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
add a comment |
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Lacking any actuall code to debug, all I can give you is the gist.
AccessViolationException is part of the OS Memory Protection. AV Exceptions usually requires someone handling naked pointers and bleeping stuff up, wich is scarily easy to do.
You usually do not get them in .NET. The designers went out of their way to prevent you from needing to handle naked pointers. There is still a few possible causes:
- You are using unmanaged code - in particular PINvoke - or unsafe code and thus handle naked pointers
- You swallow fatal exceptions. After you do that, you get more and less undstandable followup eceptions. This one is just one option. I advise reading these two articles to get the proper handling: https://blogs.msdn.microsoft.com/ericlippert/2008/09/10/vexing-exceptions/ https://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET
- Binary damage to the .NET libraries
- 3rd party interference, particular virus scanner. I remember 3-5 years ago we had such an issue with Windows Forms and AVG. And I can remember someone else having similar issues just last week or so...
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
add a comment |
Lacking any actuall code to debug, all I can give you is the gist.
AccessViolationException is part of the OS Memory Protection. AV Exceptions usually requires someone handling naked pointers and bleeping stuff up, wich is scarily easy to do.
You usually do not get them in .NET. The designers went out of their way to prevent you from needing to handle naked pointers. There is still a few possible causes:
- You are using unmanaged code - in particular PINvoke - or unsafe code and thus handle naked pointers
- You swallow fatal exceptions. After you do that, you get more and less undstandable followup eceptions. This one is just one option. I advise reading these two articles to get the proper handling: https://blogs.msdn.microsoft.com/ericlippert/2008/09/10/vexing-exceptions/ https://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET
- Binary damage to the .NET libraries
- 3rd party interference, particular virus scanner. I remember 3-5 years ago we had such an issue with Windows Forms and AVG. And I can remember someone else having similar issues just last week or so...
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
add a comment |
Lacking any actuall code to debug, all I can give you is the gist.
AccessViolationException is part of the OS Memory Protection. AV Exceptions usually requires someone handling naked pointers and bleeping stuff up, wich is scarily easy to do.
You usually do not get them in .NET. The designers went out of their way to prevent you from needing to handle naked pointers. There is still a few possible causes:
- You are using unmanaged code - in particular PINvoke - or unsafe code and thus handle naked pointers
- You swallow fatal exceptions. After you do that, you get more and less undstandable followup eceptions. This one is just one option. I advise reading these two articles to get the proper handling: https://blogs.msdn.microsoft.com/ericlippert/2008/09/10/vexing-exceptions/ https://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET
- Binary damage to the .NET libraries
- 3rd party interference, particular virus scanner. I remember 3-5 years ago we had such an issue with Windows Forms and AVG. And I can remember someone else having similar issues just last week or so...
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
Lacking any actuall code to debug, all I can give you is the gist.
AccessViolationException is part of the OS Memory Protection. AV Exceptions usually requires someone handling naked pointers and bleeping stuff up, wich is scarily easy to do.
You usually do not get them in .NET. The designers went out of their way to prevent you from needing to handle naked pointers. There is still a few possible causes:
- You are using unmanaged code - in particular PINvoke - or unsafe code and thus handle naked pointers
- You swallow fatal exceptions. After you do that, you get more and less undstandable followup eceptions. This one is just one option. I advise reading these two articles to get the proper handling: https://blogs.msdn.microsoft.com/ericlippert/2008/09/10/vexing-exceptions/ https://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET
- Binary damage to the .NET libraries
- 3rd party interference, particular virus scanner. I remember 3-5 years ago we had such an issue with Windows Forms and AVG. And I can remember someone else having similar issues just last week or so...
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
answered Nov 24 '18 at 14:53
ChristopherChristopher
3,0062823
3,0062823
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
add a comment |
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
1
1
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
@ZuzanKoKoHtet Nothing in the code you showed should cause this exception. So we can excldue option 1. that still leaves the 3 others that only you can debug.
– Christopher
Nov 25 '18 at 14:46
add a comment |
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1
I edited.thank you
– Zuzan Ko Ko Htet
Nov 25 '18 at 11:29
I think that should work. Hmm. Can you provide the full exception and stack trace (when it pops up you should be able to click "Copy Details")
– John
Nov 25 '18 at 11:34
System.AccessViolationException HResult=0x80004003 Message=An attempt was made to perform a read or write operation on protected memory. Other memory may be broken. Source=<Can not evaluate the source of the exception> Stack trace: <Unable to evaluate exception stack trace>
– Zuzan Ko Ko Htet
Nov 26 '18 at 0:10
Can you try disabling your anti-virus software and then running your application again?
– John
Nov 26 '18 at 0:53
Okay!! I will test !!
– Zuzan Ko Ko Htet
Nov 26 '18 at 1:34