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Hi,
I beg to differ: whoever creates/opens a file is in control regarding the
operations others can do to the same file.
one can easily share a file between threads and even processes; it suffices
to apply the correct FileShare value when creating/opening the file.
My example shows a first stream writing to a file it allows others to read,
and a second stream reading from same file allowing others everything:
string filename="streamTest.txt";
using(FileStream fw=new FileStream(filename, FileMode.Create,
FileAccess.Write, FileShare.Read)) {
using(StreamWriter tw=new StreamWriter(fw)) {
tw.WriteLine("Created new file");
using(FileStream fr=new FileStream(filename, FileMode.Open,
FileAccess.Read, FileShare.ReadWrite)) {
using(StreamReader tr=new StreamReader(fr)) {
for(int i=0; i<10; i++) {
tw.WriteLine("line "+i);
tw.Flush();
string s=tr.ReadLine();
Console.WriteLine(s);
}
}
}
}
}
BTW the flush is there to undo the buffering that takes place in these streams;
without it there probably would be nothing to read when the short loop
terminates; for longer streams, flushing is not needed ! And normally
the reader should continue to read after the writer has done, my example does not.
PS: sorry for posting a C# example in a VB.NET forum !
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hi Luc Pattyn
but its not working mate
i am appending the string
is it because of that something else
with regards
Balagurunathan.B
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balakpn wrote: not working
please be more specific: if it throws an exception show it; if it runs but
does not produce the expected outcome, please explain.
I did run my example before posting it. Much depends on the FileMode, FileAccess
and FileShare values you use EVERY time the file or filestream gets created/opened.
e.g. the simplest overloads for creatinbg/opening a file (those with default values
for FileShare) would use FileShare.None, disallowing others to touch the file.
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hi
its working fine
i made a minor mistake thts the problem sorry and thanks a lot
with regards
Balagurunathan.B
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I am developing ASP.NET Web Application using vb.net One of
the requriement of this application is ...when user submit
the Web Form....it should open the Word Templete and
insert the values into that templete...
Does anybody knows...How to Open and Writes into Word
Document Using ASP.NET and vb.net Directly...i am looking for
specific sample...
Thanks,
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What on earth are you thinking here ?
1 - I told you that ASP.NET isn't going to matter to your solution
2 - I told you what you need in order to do this, all you have to do is google and download it, I'm sure it comes with samples
3 - for all that, I am sure that you're not the first person who wants to do this, there must be countless google hits that will tell you the answer, with code
4 - posting the same question over and over, when the last time you asked is still visible, is just plain annoying, it's not going to leave anyone inclined to answer you any faster.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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OK, well, perhaps you need to write a single, intelligent post that actually outlines what you have done, instead of posting the same vague question over and over ? If what you want to do, occurs on the client side, then it's not going to work in ASP.NET, because the server code is on the server, not on the client.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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One Post is enough.
WHy are you again and again posting the same question.
there itself CG has answered you.
Regards,
Satips. ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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Got to love it when instead of taking your advice, they just delete all their posts.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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You're mixing types in a horrible way.
BTW, since tot is an Integer, it cannot store a floating point value.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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so what should i do to store float numbers
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Use a float, decimal, or double. The questions you're asking, and the code you're posting, indicate that you should slow down, buy a basic book on VB.NET, and work through it. You should certainly be aware of the horror of VBs loose typing, and be aware of when you're relying on it to make your code work, it can create all sorts of hidden bugs and side effects.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I want to validate that my textbox contains a numerical value.
I do this in the "textbox.validating" event, everything works fine until all the text is cleared and the box has an empty string. The validation doesn't allow an empty string because it's not numerical (no matter how I code it). But this field is not compulsory for the user to enter, so he should be able to enter either a numerical value or an empty string.
Here is my code so far, it doesn't work for empty strings, textbox remains invalidated and forces focus onto the control.
Private Sub MyMaskedTextBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyMaskedTextBox.Validating
Dim num As Double
If Me.MyMaskedTextBox.Text = "" Or IsDBNull(Me.MyMaskedTextBox.Text) Then
MyErrorProvider.SetError(Me.MyMaskedTextBox, "")
Else
Try
num = Me.MyMaskedTextBox.Text
MyErrorProvider.SetError(Me.MyMaskedTextBox, "")
Catch ex As Exception
MyErrorProvider.SetError(Me.MyMaskedTextBox, "Value must be numeric")
End Try
End If
End Sub
This is a real problem because nothing I've tried so far allows the user to enter an empty string!
Can't I somehow force the field to validate even if the contents don't match the validation criteria?
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
"Watching Migthy Joe Young made me hate my life..................................I want a gorilla!" A. Havemann
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The following code may be better
if string.isnullorempty(Me.MyMaskedTextBox.Text) orelse isnumeric(Me.MyMaskedTextBox.Text) then
'Its a number or an empty string
else
'Its got content but is not numeric
end if
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Thank you SHatchard but that code does exactly the same as mine.
The textbox still doesn't validate with an empty string and focus is forced to the control until it validates.
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
"Watching Migthy Joe Young made me hate my life..................................I want a gorilla!" A. Havemann
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This field is databounded to a DB cloumn of the type Double.
It seems that NULL is not accepted by datasets for Double columns.
Eventhough the default value is DBNull (which .Net accepts) and the AllowDBNull property is set to TRUE (which .Net accepts)
The columns NullValue property can only be set to <throw exception="">, .Net rejects all other selections.
I still don't have a solution but this problem starting to look more like a bug in .Net than and not in my code.
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
"Watching Migthy Joe Young made me hate my life..................................I want a gorilla!" A. Havemann
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try to replace
--If Me.MyMaskedTextBox.Text = "" Or IsDBNull(Me.MyMaskedTextBox.Text) Then
with
--if isnothing(Me.MyMaskedTextBox.Text) then
or
--if Me.MyMaskedTextBox.Text is nothing then
if it still doesnt work... may i know what vb are you using?
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Thank you for the response!
That doesn't work either, I'm using VB .Net in Visual Studio 2005.
That field is data-binded to a dataset, the column's type is Double.
I think that has something to do with it not allowing Nulls.
Funny thing is, it allows NULLS, just not when you try to enter it with the textbox!
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
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O.k, I found a work-around for the problem. Posting it here for the sake of anyone having similar problems.
What happens that causes the problem is that VS doesn't allow a control (in my case a textbox) to lose focus if the text inside it doesn't validate. But for numerical textboxes it also doesn't validate empty strings, even if you want the user to be able to add an empty string.
The solution is to set the data source update mode to never, this disables .Net validation on the control, allowing you to do this with custom code.
Me.MyNumericTextBox.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.Never
The validating event still fires though, but it's under YOUR control now, so the following code will allow you to force the user to enter either a numerical value, or an EMPTY STRING.
Private Sub MyNumericTextBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyNumericTextBox.Validating
If String.IsNullOrEmpty(Me.MyNumericTextBox.Text) OrElse IsNumeric(Me.MyNumericTextBox.Text) Then
MyErrorProvider.SetError(Me.MyNumericTextBox, "") 'Fire or cancel the
'error in whatever way suites you, this simply clears the errorprovider
Else
MyErrorProvider.SetError(Me.MyNumericTextBox, "The value must be numeric") 'Fire or
'cancel the error in whatever way suites you, this sets the error on the errorprovider
Me.MyNumericTextBox.Focus() 'This forces the user to enter the validated
'data before leaving the control
End If
End Sub
Please reply to this post for more information.
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
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ASP.NET is irrelevant, you're talking about doing this on the server. I'd look at the Visual Studio Tools for Office, they allow you to manipulate office documents in code.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Hi,
i have created one seup application for ne of the company now i want to add Image on the shortcut file which will be created after installing the setup.
So,does anyone knoes how to do this???
GIRISH
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You can set the icon in the setup program, you just have to include the icon image in your setup and then reference the icon in the proper places in the setup project. So you will have the extra icon file when you install your application.
Ben
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To include image Icon
Go to Application Folder and add an icon file there,
and give that path to Desktop or Program Files Reference(give it by Right clicking and selecting icon property)
TO add Icon to Add or Remove programs
press F4(properties)of setup project
the first opetion will be the add icon to addorremove programs one
just select ur icon file
It works for me,
Prashanth
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hi,
Thank you very much for your reply.
GIRISH
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