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String literals are never disposed. They are compiled into the static data of the assembly, and when you create a string object from a literal, you just get a reference to the static data.
---
single minded; short sighted; long gone;
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then why the profiler is showing me it in memory
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Milan@DIGICorp wrote: then why the profiler is showing me it in memory
Where else would it be?
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i mean that after closing the form where i have used string literal
they dont realease memory they have used
they are of age 40-45 and more.
i think they should be removed as i close the form or the next gc call
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I haven't done the profiling to test this, but there is a theoretical possibility that the static strings will hang around in memory until the assembly that they are loaded from is unloaded. This could be your .EXE or a .DLL that your .EXE loads. If they are in the .EXE, then they'll live for the entire duration your app is running. If in a .DLL, they'll live only so long as when the AppDomain that loaded the .DLL unloads. Again, if your .DLL is not loaded into a seperate AppDomain that you created, they'll live for as long as your application is running.
I can also see the possibility that static strings will never go away, so long as your app is loaded. This is because static information exists without an instance of the class that defined them being created. They exist all the time.
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As I said, the string literals is part of the static data in the assembly. They are loaded when the assembly is loaded, and they are only removed from memory when the assembly is unloaded.
Using a string literal doesn't use any memory. The memory is already allocated for the static data. Using a string literal doesn't allocate any more memory, so there is no memory to free when you don't use the string any more.
---
single minded; short sighted; long gone;
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can i programatically find out the window which was last opened (just opened).
eg i opened the c:\program files then c:\windows .
then my program should tell that the freshly opened document is C:\Windows.
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There's no API that does this directly.
You can get notifications of window creation and destruction if you implemented a Window Hook called CBT. This article[^] gives a limited view of a .NET implementation of the CBT hook.
Warning! Windows Hooks is VERY advanced topic and requires knowledge of how Windows works internally to understand it.
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iam new to vb.net,iam posting the code i hav written please make modifications where ever neccesary
cmd.Connection = cn
cmd.CommandText = "select max(EMP_CODE)+1 as lastfrom EMP_DETAILS where EMP_PLACE='" & ComboBox1.Text & "'"
cn.Open()
While dr.Read
cmd.ExecuteScalar()
TextBox1.Text = dr.Item("last")
End While
cn.Close()
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Hi
Check this example and apply your code .. You need not use while loop if you are executing ExecuteScalar as it returns one row only.
Example from MSDN[^]
Hope you got it..
Harini
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iam vb6.0 programmer,this code works fine in vb6.0,how to write same code in vb.net
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cn.Open()
cmd.Connection = cn
cmd.CommandText = "select max(EMP_CODE)+1 as last from EMP_DETAILS where PLACE='" & ComboBox1.Text & "'"
dr=cmd.executeREADER
While dr.Read
TextBox1.Text = dr.Item("last")
End While
cn.Close()
Now Check it
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hi iqbal ,it is displaying a message "The select statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect".
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try this:
cn.Open()<br />
cmd.Connection = cn<br />
cmd.CommandText = "select max(EMP_CODE)+1 as [last] from EMP_DETAILS where PLACE='" & ComboBox1.Text & "'"<br />
dr=cmd.executeREADER<br />
While dr.Read<br />
TextBox1.Text = dr.Item("last")<br />
End While<br />
cn.Close()
Hope this helps you.
Peace!
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Dear All,
i am creating application in vb.net,
and using word,excel objects in that application,
as they are very heavy weight objects and they are consumed tons of memory, my application is slow down in performance is there any way to increase it....
or any coding tips that i use in my application..
please help...
Take care,Best regards
-koolprasad2003
Be A Good S/W Eng... Life is swing with you..Enjoy..
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try to leave the objects opened-loaded, so you can reuse them.
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Yeah, don't use Word in your ASP.NET application.
Do your conversions ahead of time so the user isn't waiting for Word to start on your IIS Server, load a document, resave it in a conversion to HTML, and then a return response of the new HTML document.
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Hello,
how do I greate a new instance oy my Generic Type when I have an Object of Type Type which represents my Type?
Thanks,
Nathanel
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Could you provide an example, because your question is very confusing.
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Something like this
<br />
<br />
Dim MyType = xyz.getType()<br />
Dim myList As new Generic.List(Of MyType)<br />
<br />
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Your explaination is a bit confusing and incomplete. I'll show you whats normally done:
Public Class MyClass
Public Field1
Public Field2
End Class
.
.
Dim myCollection As New List(Of MyClass)
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Hi, I have tried many thing about send sms to mobile phone by vb.net, but many problem found, does anyone know? Please help me.
Regard
Socheat
................
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Obviously, what you need to do, is find a way to interface with a gateway that accepts SMS, probably online.
This[^] looks like it has what you need.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"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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Yes, i want to find a code, or example.
Socheat
................
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