C# - In The Context Of The CLR In .NET How Is Stack Space Allocated
May 12, 2011
In the context of the CLR in .NET how is stack space allocated and what is it typically limited by? For example: Can any given thread continue to add to the stack until memory runs out? If not; how does the CLR decide how much space to allocate and can it change its mind?
PS: Just to put some context on it this all started from a discussion on how to build a method that will calculate the Fibonacci sequence and one of the suggestions was a recursive function.
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Sep 8, 2011
I am wondering if anyone has any idea how to make the controls stack and fill up the available space left by a control if the control is hidden or removed from the UltraGridBagLayoutPanel.
Example:
[Textbox 1]
[Textbox 2]
[Textbox 3]
[Textbox 4]
[Textbox 5]
If I hide [Textbox 3] as of now, it will disperse the space left equally and pad the remaining text boxes with the space. However, I would like it to do this...
[Textbox 1]
[Textbox 2]
[Textbox 4]
[Textbox 5]
Where all the text boxes will move up and [Textbox 4] will completely consume the space left by [Textbox 3].
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Sep 25, 2011
How would i get a certain text inside a textbox to equal that text space to space or null to space?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Textbox1.Text.StartsWith(Textbox2.Text + " ") And Not String.IsNullOrEmpty(Textbox2.Text) Then
Textbox1.Text = Textbox1.Text.Remove(0, Textbox2.TextLength)
Textbox3.AppendText("a")
End If
Btw: after i finish this step my project will be finished!
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Jun 22, 2012
How do I find the memory or CPU used by my software?
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Jun 21, 2010
1) How to Delete Dynamically Allocated Array?
a) delete a[]
b)delete a[0]
c) delete[] a
d)delete [0] a
My answer a.Correct or not
2)Can we use DML statement in function?
a)Yes
b)No
c)Temp tables
d)None
My answer d.Correct or not
I read somewhere the diff b/w stored proc & functions?One of them is Stored Procedure returns more than one value whereas functions return single value.When the interviwer ask me the question,i asnwered includg my above point,but he told me no SProc do no return any value.
4)Can we return value from SPROC?
a)No
b)Using O/p Parameters
c)Using return statement
d)B & C Both
ANSWER---??
5)Views are complied or not
a)Yes
b)No
c)Partially Compiled
d)None
ANSWER---??
6)Can we user specific data in application? My answer no.Me correct 7)Diff b/w primary key & UNIQUE key excepts one diff primary doesn't allow NULLS whereas unique does.One diff i told we can craete only one primary key for a table,whereas a table can have more than one unique key.
ANy more differences?????
8) Can we call a fn. widout dbo? I ans NO. Me correct or nt
9) Four types of files created by assembly?
10) What is candidate Key?
11)Can we implement CAS in config file? I ans YES. Me correct or nt
12) dim txt as textbox
dim txt as new textbox
Both the above statements are same or not.If nt wats d diff? I ans both are same. Me correct or nt
13)CAS is part of inbuild framework? I ans YES. Me correct or nt
14)Can constructor call itself?
15)Accept method applies to
a)Textbox
b)Listbox
c)Combobox
d)None of above MY ans a. Me correct or nt
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Aug 9, 2011
I am pulling data in from a query, where three of the columns are being put into the same Listbox.Does anyone know of a sort statement to sort it alphabetically after inserting the data into a listbox, or would I be better putting the results of my query into three arrays and then putting them the arrays in, in the order I want them in.
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Feb 11, 2012
Once i allocate arrays is the memory allocated for them immediatlyy or once i add data to the array? like say i create an integer with 400 million arrays (lol) would visual basic allocate memory immediately for each of the 400 million arrays or once there is data allocated to one of the 400 million arrays, say when i put the number 4 in the 100th array.
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Aug 20, 2009
When bulk renaming files (14000 of them) i get this error: The CLR has been unable to transition from COM context 0x4cefd8 to COM context 0x4cf148 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.
My code is as follows:
Private Sub frmTest_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim asd As List(Of String) = FileIO.FileSystem.GetFiles("D:Music").ToList
Dim rs As New ADODB.RecordSet("SELECT * FROM Songs", My.Settings.Files_Database__Connection)
[code].....
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Jun 8, 2011
I got this message because of a long process: ContextSwitchDeadlock was detected
Message: The CLR has been unable to transition from COM context 0x3dc190 to COM context 0x3dc300 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time.
To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations. I've poked around on the internet and on a forum, someone suggested to use application.doevents(). I did that and the messaged goes away. In an earlier thread a member wrote that using application.doevents rarely was used appropriately. Is my situation a proper usage of application.doevents or is there something else I should be doing?
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Sep 11, 2009
In VB.NET, if I create a class it is a reference-type. But, if that class it chock full of value type properties, how is this handled? If the class is instantied but never filled, I suspect a pointed for to the heap is allocated. But is more space allocated on the stack for all of it's value type properties?
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Sep 8, 2011
I am using a picture box. I want to be able to use the Space or Enter key to change the image in it. For that, I try to use the keydown function as follow:
Private Sub ChestWindow_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
Select Case e.KeyCode
Case Keys.NumPad1[code]....
is the function which changes the image. It works well when I press '1' on my numeric part of the keyboard as a test.The issue is that when I press Space or Enter, the form containing the picturebox closes. (I've already put the keyPreview property to True)
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May 15, 2010
VB express 2008 .net 3.5 or .net 4.0 VB express 2010?I have written application to convert RTF to HTML. The main Purpose of the application is to copy VS code to the clipboard and covert it then put it back into the clipboard as a HTML Document so that it can be pasted into a HTML document such as Windows Live Mail. I found that code copied and pasted is spaced out in in the wrong positions.
The applications works perfect with no bugs so far. I then asked Myself how to go about doing the copy with the least amount of operator interaction. So I added an Icon to the Icon Tray with a right click menu to use to convert once the Rich Text Format was copied to the clipboard. This works fine except you have Five steps, Select the text, Copy to clipboard, Right Click the icon, Select the Converter and Paste. The normal is three steps.
To this the best solution is to add a context menu item to the active form such as the RTF editor or window. So that when you select the Rich Text to copy and right click on the form to bring up that menu then to Just Select the menu Item such as "Copy RT and Convert" I searched and found about 544000 Items and tried to restrict down to no avail. I read until I finally gave up. I did not find any code examples of this. Almost every thing I found related to the web or some other explicit document like Excel and not to the Various windows that could be active with RT in it.
how do you add a context menu item to the context menu of an active rich text format window such as WordPad or VB?I have test in my application that tests to see if it is a RTF in the clipboard so if it is not the converter does nothing.
Imports System.Threading
Imports System.IO
Imports System
[code]....
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Oct 13, 2009
In your actual programming experience, how did this knowledge of STACK and HEAP actually rescue you in real life? Any story from the trenches? Or is this concept good for filling up programming books and good for theory?
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Mar 10, 2010
What I want to know is that in VB.net is it possible to get a stack overflow, and if so how is it caused. What I mean is, what sort of written code would cause a stack to overflow.
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Apr 21, 2011
I need to write a VB.NET code to reverse the given characters using a stack.Input: 'S','T','A','C','K' So far I have input the letters, but I don't know how to get the console to reverse it. I'm a beginner to programming so please excuse my ignorance.
Module Module1
Sub Main()
Dim StackObject As New Stack
[code].....
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Apr 15, 2009
I've started using .Net's stack collection. The basic features I guess are the "pop" and "push", where you add or take off the top element of the stack (if you are referencing other elements in the stack then another collection type is probably better).[URL]..it appears that the Stack collection (like other collections) is basically an array with some window dressing (so you actually can see other elements). As far as I can tell, "popping" and "pushing" is changing the first element of the array. Shouldn't instead the final element be the "top" of the stack and be the one that is changed? Otherwise the program has to reindex all the other elements in the array every time a pop or push is made. This seems very inefficient. But this is what Microsoft's description appears to be saying what is happening.
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Jun 22, 2009
My problem is that i need log the stack call. I know that i can put a breakpoint in code and choose the debug menu option "call stack", But that is not a solution for me, because i need all the methods called by the application, not only the last until the breakpoint.
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Apr 14, 2009
I just started programming in VB.NET 2008 with the Express edition and have been having a blast so far. I thought a fun program to try and make would be an infix to postfix program.
I have five text boxes off to the side of my program that shows what is on the stack as you iterate through the equation. I'm wondering if it's possible to make these textboxes set to display what is at a certain index of a stack.
For example, if I pushed a "(" onto the stack, I would like the top box of my textboxes to update and show a "(". When something else is pushed onto the stack, say a "/", I would like the "(" to be displayed in the second box down, and the "/" to be displayed in the top box now.
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May 11, 2010
I did alot of work then I suddenly get this error message
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Jan 7, 2009
We have this funky little ObjectDisposedException happening now and again. But only on production machines, of course ... can't recreate the issue on my dev unit. So I trotted on out to the Microsoft site to see what members of this exception I could use to figure out what's going on. Microsoft says that one of the members is StackTrace. I double and triple checked that I'm looking at .Net 1.1 information as I'm pretty sure that's what I'm using (how can I check that?). Here's the page I found - [URL]
So I go back to my program to write something useful to the event log so I can figure out what's going on. And when I look at the members of the ObjectDisposedException available to me I only see the following: GetBaseException, GetType, InnerException, Message, ObjectName, ToString.
what happened to my StackTrace member? I sure could use it if I could figure out how to get to it.
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Oct 23, 2010
As a learning experience I decided to try and implement the Shunting Yard Algorithm(string calculator) using OOP. It was successful for as far as I took it, but it had one flaw. In order to get the stack to be accessible from the operators I had to declare it as shared, which meant that all versions of the calculator shared one stack. This very short piece of code illustrates what I came up with and the "flaw". [code] How can I maintain the functionality of anOP.add1 without declaring "something" as shared?
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Oct 31, 2010
this exception gets raised on a standard dim command???
Public Sub Life(ByVal AnyEvent As Object) Dim myNewLife As New Life Dim Happiness As New Collection Happiness.Add(AnyEvent) myNewLife.Experience(Happiness) End Sub
[code].....
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Oct 24, 2011
I want to put a two dimensional array into a stack and then check the stack to see if it contains the first dimension of the array. Is there any way to override the contains function to do this.
Example:
Dim MyStack as stack
Dim sItems(0,2) as string
sItems(0,0)="Error 1"[codee].....
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Oct 27, 2009
I'm writing this program in Visual Basic .NET to organize different fields of data, and I'm using profile slots through application settings to store the data for users. But, I ran into a stack overflow error in my SlotSelect.vb class. My best plausible guess for why this happens is that I'm using the wrong kind of variable container in the below sauce code, but my dilemma is that I don't know what specifically is going wrong.The code that the vshost is saying is the cause for the overflow was written from some code that I looked up on MSDN and other places for referring to objects in other classes, and I tried using other variants of it to see if it was any different. So far, nothing has worked, and it doesn't stop the error while compiling, much less in the code markup--it only catches it when it starts the application in debug after it finishes building
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Oct 2, 2010
I'm implementing multi-level undo/redo via a pair of stacks. This works well, but I'd like to limit the number of undo actions (actually objects representing the state of the application) . Once the limit of actions in the stack has been reached, I want to keep adding actions to the stack, but get rid of the oldest (bottom) items as I go.
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Feb 15, 2012
I am trying to add (Push) whatever the user enters in (MyStack) into 5 different labels that should show the (UserResponse). The problem is I don't know how to display each element in a different label. For example:
- The first element that the user enters (UserResponse) should be in Label1
- The second element that the user enters (UserResponse) should be in Label2 etc.... up to label5.
Also, when I press (Pop) the elements should disappear (Last in first out).
Public Class Form1
Private MyStack As New Stack(4)
Private Sub ButtonPush_Click(sender As System.Object, e As System.EventArgs) Handles ButtonPush.Click
[Code].....
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Apr 27, 2011
The following code (calling proc DiskFreeSpace) throws an "unbalanced stack" error message.
Private Declare Function GetDiskFreeSpaceEx Lib "kernel32" Alias "GetDiskFreeSpaceExA" (ByVal lpDirectoryName As String, _
ByVal lpFreeBytesAvailableToCaller As Long, _
ByVal lpTotalNumberOfBytes As Long, _
ByVal lpTotalNumberOfFreeBytes As Long) As Long
[code]....
Additional note: My function does need to work for UNC paths also (local and/or network).
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Mar 24, 2011
I am trying to make a calculator to calculate how many sheets of a product of varying thickness to put into a stack and how many stacks are required to make a whole pack, taking into account that some packs have no cover sheets and some have one at the bottom only and some have top and bottom.
As you can see there are a few variables and to make it harder is the way the stacks are made. No stack can be over 180mm and the last two stacks are halved to make the last two an even height (roughly).
I have a For Next loop and this would be okay if it wasn't for the 2 odd stacks at the end and the cover sheets.
This is what I have anyway.
CB = txtBottomCB.Text
lstDisplay.Items.Clear()
MaxBookHeight = (txtBookHeight.Text)
[Code].....
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Feb 12, 2012
could you tell me, why I get the stack overflow error on this code?
Dim ev As Double = datum.Year * 365 * 24 * 60 * 60
Dim honap As Double = datum.Month * 30 * 24 * 60 * 60
Dim nap As Double = datum.Day * 24 * 60 * 60
Dim masodpercek As Double = ev + honap + nap
The double datatype should be enough.
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Jun 27, 2010
This code worked fine in WinForms under .NET 3.5, but since I've started using WPF and .NET 4.0, it no longer works (although I'm not sure if this is a coincidence or not). The purpose of this is to detect if a mouse button (or multiple mouse buttons) is being pressed outside of the application.[code]...
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