Memory leak issue. - .NET (Core and Framework) Discussion Boards

Re: button style

Paul Conrad13-Jul-07 13:05

Paul Conrad

13-Jul-07 13:05

Not sure. Maybe create a custom control...

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

Decryting Passwords stored in aspnet_Membership table

Vipul Mehta28-Jun-07 22:26

Vipul Mehta

28-Jun-07 22:26

Hi,
In my web app I am using Windows authentication along with provider model to store the user details in aspnet_Membership table. So when I create a new User from 'ASP.NET Cofiguration' website, the password gets stored in "Hashed" format in aspnet_Membership table.
Can I decrypt this hased password? If yes can I you please let me know how it can be done?

Thanx in advance.

Regards,
Vipul Mehta
Sr. Software Engineer

Re: Decryting Passwords stored in aspnet_Membership table

originSH29-Jun-07 0:15

originSH

29-Jun-07 0:15

The point of hashes are that they are one way transformations, they cannot be reversed.

This is why it's more secure to store a password as a hash rather than just encrypted, it means that even with time and computing power the original password cannot be retrived.

http://en.wikipedia.org/wiki/Cryptographic_hash_function[^]

Re: Decryting Passwords stored in aspnet_Membership table

Vasudevan Deepak Kumar29-Jun-07 1:34

Vasudevan Deepak Kumar

29-Jun-07 1:34

Hash is one-way encryption.

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Getting real sender of HelpRequested events

m_g_a28-Jun-07 20:40

m_g_a

28-Jun-07 20:40

Hi,

I'm working on a Component providing help for complex forms. For that, I'm registering at the HelpRequested event of the root Control.

This way, I'm able to catch all help events without registering at all Controls. But now I've the problem, that all events I catch seem to come from the root Control.

Is there a way to get the real sender of the HelpRequested event without registering at all controls? (Perhaps via MousePos?).

Thanks in advance

Michael

Re: Getting real sender of HelpRequested events

Robert Rohde1-Jul-07 2:25

Robert Rohde

1-Jul-07 2:25

Try calling GetChildAtPoint from your parent control with the coordinates specified in the event arguments.

Robert

Re: Getting real sender of HelpRequested events

m_g_a3-Jul-07 21:32

m_g_a

3-Jul-07 21:32

Hi Robert,

Thanks for the pointer. That did it!

Michael

Memory leak issue.

PSK_28-Jun-07 19:32

PSK_

28-Jun-07 19:32

Hi all,

I have created a scheduling service which runs all the time, I am having a query regarding following set of code.

private DataSet GetDataSet()<br />
            {<br />
                           <br />
                DataSet excelDataSet = new DataSet();<br />
                OleDbConnection excelConnection = new OleDbConnection(myConnectionString);<br />
                OleDbCommand excelCommand = new OleDbCommand(@"SELECT * FROM  " +fileName, excelConnection);<br />
                OleDbDataAdapter excelAdapter = new OleDbDataAdapter(excelCommand);<br />
<br />
                excelConnection.Open();<br />
                excelAdapter.Fill(excelDataSet);<br />
<br />
                if (excelConnection.State == ConnectionState.Open)<br />
                    excelConnection.Close();<br />
                <br />
                return excelDataSet;<br />
            }

Do I need to call dispose on OleDbDataAdapter and OleDbConnection connection object to avoid memory leaks or garbage collector will take care of this?

Regards,
Prakash Kalakoti

Re: Memory leak issue.

nitikin29-Jun-07 0:21

nitikin

29-Jun-07 0:21

Though the GC would collect all of the allocated managed memory periodically, its best to dispose off the DB objects when you are done. Your code should have been in the lines of :

using(OleDbConnection excelConnection = new ...)
{
etc etc
}

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

PowerCOllections OrderedList

Santiago Perez28-Jun-07 7:52

Santiago Perez

28-Jun-07 7:52

I recently downloaded and was interested in using the OrderedDictionary class but can't seem to index items because it doesn't inherit OrderedList. It does Implement COllection though and I would assume I would be able to index an item but no go, can't index the values or Keys. Anyone had any luck with this? Is there another library in the PowerCOllections that will allow you to find an item by either the Index or Key?

Thanks,

Santiago Perez

Regards,
Santiago "Saint" Perez

Florida's Turnpike Enterprise Santiago.perez@dot.state.fl.us

Assembly loading - directories

David Knechtges27-Jun-07 9:57

David Knechtges

27-Jun-07 9:57

I have an application that is organized like below: (top to bottom)

COMenabled.EXE
OCXControl.ocx
DLLLibrary.dll (linked statically with a managed C++ wrapper)
NETLibrary.dll (C# DLL)
(other C# DLLs)

So basically, the COMenabled.EXE has a reference to the OCXControl, which links to the DLLLibrary, which in turn links to the NETLibrary, and so on down the line....

I have a problem where if I do not place the COMenabled.EXE in the same directory as the OCX control, it gives me an exception trying to load the NETLibrary.DLL. If I put it in the same directory, it then works.

I do not have any config files for any of the DLLs or EXEs.

Also, I do not load any of the DLLs into the GAC either. The same problem listed above occurs even when I load NETLibrary.dll into the GAC.

Can anyone give me suggestions as to what the problem is and how to solve it?

Thanks,

David

Remoting: Switching between MBR and MBV at run-time.

Andy L 226-Jun-07 23:15

Andy L 2

26-Jun-07 23:15

I am about to embark on a complex mechanism for instantiating hierarchical sets of remotable classes to handle Marshal-By-Reference and Marshal-By-Value remoting.

The reason for this is to enable the client to be able to continue working disconnected from the server should a server fail for some reason.

To keep it simple the model I am considering involves the server objects switching between MBR and MBV.

Anyone done this before and knows of a simple way to do this without having to reconstruct the objects on the server?

Re: Remoting: Switching between MBR and MBV at run-time.

nitikin29-Jun-07 0:27

nitikin

29-Jun-07 0:27

Andy,

Am not clear on your requirement. Do you have a web service or a remoting host which exposes the object to the client? Not sure why the client cant just work off the serialized object?

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

Re: Remoting: Switching between MBR and MBV at run-time. [modified]

Andy L 229-Jun-07 6:00

Andy L 2

29-Jun-07 6:00

Hi Nitin,

Thanks for your reply.

I am trying to create remoting objects that can be referenced on a server when in a particular, if you like 'chatty', role but also the same objects having the capability of being serialized onto the client is in another role where they are connected to heavy weight data processing.

An example: Supposing you have a Person object that is connected to security logon - Person in this role would not need to be serialize and Marshal-By-Reference would suffice. However, the same Person object could also be associated with a Product, Order, Patient and Medical information later in a process and involved with longer and heavier processing where the lifetime of the object on the client may even span several sessions - here Marshal-By-Value is probably best. However the Person object is the same - I was hoping to find a way to initially use a Person object reference on the server and transfer/serialise that same Person object to the client without having to construct a new Person and copy data across.

Bearing in mind that there will be many such objects, one of the main reasons therefore is to try and reduce server processing of these objects, and also could be useful to be able to cache state and behaviour on clients for cross session reasons.

I hope that makes sense?

Andy

-- modified at 12:15 Friday 29th June, 2007

Re: Remoting: Switching between MBR and MBV at run-time.

nitikin1-Jul-07 23:36

nitikin

1-Jul-07 23:36

Andy,

From what I follow, you need a mix of MBR, MRV. For this, I can only think of creating a MBR descendant object which implements ISerializable (or mark as Serializable). This way, you start with an MBR object on the server and when the client requests for the instance (perhaps identified with an Guid?), the server serializes the object and returns it.

But, do note that MBV is usually recommended only for light weight objects.. since the whole object is being passed across.

Thanks,
Nitin

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

Re: Remoting: Switching between MBR and MBV at run-time.

Andy L 23-Jul-07 10:01

Andy L 2

3-Jul-07 10:01

Yes thanks Nitin. I am also looking at customised serialisation too - I've got some learning to do in this area.

I will try what you suggest and I am aware of the size limitation for MBV - the idea is to serialize pieces of the object model to and from the client and not the whole thing in one go, but do this only where necessary and only for writeable objects.

I know there are a whole load of data integrity issues too but that another story.

Andy

Problem in converting WinHelp to HTML Help [modified]

asha_cybergirl26-Jun-07 22:36

asha_cybergirl

26-Jun-07 22:36

Once i convert the Winhelp to Html Help i am able to get only the .htm and .hhk files. I am not able to get the .hhc(contents file).Does the file size matter while converting or could there be any other problem??????

ASHA

-- modified at 4:45 Wednesday 27th June, 2007

ASHA

Common DLL storage

tri59525-Jun-07 23:22

tri595

25-Jun-07 23:22

We store our source code in MS SourceSafe. For common classes and functions we are not sure where to store the .dll for access by other applications etc. For example we have a database class that connects to any of the corporate DBs...
Any one have any architechture ideas

Re: Common DLL storage

Manas Bhardwaj25-Jun-07 23:42

Manas Bhardwaj

25-Jun-07 23:42

tri595 wrote:
For common classes and functions we are not sure where to store the .dll for access by other applications etc.

Keep those DLLs in GAC. Rose | [Rose]

Re: Common DLL storage

tri59525-Jun-07 23:46

tri595

25-Jun-07 23:46

Thanks... we keep the source code in MS SourceSafe and we wanted to put the Dlls in a secure location for access by another application.. they will be in the GAC when we deploy the application anyhow.. what benefit does this give?

Re: Common DLL storage

Vasudevan Deepak Kumar29-Jun-07 1:42

Vasudevan Deepak Kumar

29-Jun-07 1:42

http://www.codeproject.com/dotnet/DemystifyGAC.asp?df=100&forumid=15829&exp=0&select=836626[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

How to Activate A Control Added to Desktop

Nagaraju_Focus25-Jun-07 20:43

Nagaraju_Focus

25-Jun-07 20:43

I have Created A ListBox Control Whose Handle is Desktop.

My code for ListBox:

#using <mscorlib.dll>

using namespace System;

using namespace System::ComponentModel;

using namespace System::Collections;

using namespace System::Windows::Forms;

using namespace System:ata;

using namespace System:rawing;

using namespace System::Runtime::InteropServices;

using namespace System::Security::Permissions;

namespace DeskTopTest

{

///

/// Summary for MyListBox

///

// Requires unmanaged code

[assembly: SecurityPermissionAttribute (SecurityAction::RequestMinimum, UnmanagedCode=true)];

// Requires ability to create any window type

[assembly:UIPermissionAttribute(SecurityAction::RequestMinimum, Window=UIPermissionWindow::AllWindows)];

public ref class MyListBox : public ListBox

{

public:

MyListBox(void)

{

}

protected: virtual property System::Windows::Forms::CreateParams^ CreateParams

{

virtual System::Windows::Forms::CreateParams^ get() override

{

const int WS_EX_TOOLWINDOW = 0x00000080;

const int WS_EX_NOACTIVATE = 0x08000000;

const int WS_EX_TOPMOST = 0x00000008;

try

{

System::Windows::Forms::CreateParams ^p =ListBox::CreateParams;

p->ExStyle |= (WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST);

p->Parent = IntPtr::Zero;

return p;

}

catch (Exception^ e)

{

return nullptr;

}

}

}

public:[DllImport("user32.dll")] static int SetParent( IntPtr hWndChild, IntPtr hWndNewParent);

[DllImport("user32.dll")] static int ShowWindow( IntPtr hWnd, int nCmdShow);

[DllImport("user32.dll")] static IntPtr GetDesktopWindow(void);

public: void ShowFloating()

{

if (this->Handle == IntPtr::Zero)

{

ListBox::CreateControl();

}

//IntPtr s=GetDesktopWindow();

int x=SetParent(ListBox::Handle, IntPtr::Zero);

x=ShowWindow(ListBox::Handle,1);

}

protected:

virtual void WndProc(Message% m)override

{

ListBox::WndProc(m);

}

};

}

but when i Added this listbox to my form like:

MyListBox ^lst=gcnew MyListBox();

lst->Location=System:rawing::Point(264, 166);

lst->Name = L"comboBox1";

lst->TabIndex = 1;

lst->Visible=false;

lst->Size = System:rawing::Size(171, 200);

for (UInt16 i=1;i<100;i++)

{

lst->Items->Add("Item"+i.ToString());

}

lst->ShowFloating();

and calling the function ShowFloating();

It is working fine.

But I cant unable to focus On my Listbox & cant able to use my mouse events.

I want to focus on listbox.

Plz Suggest me .........

Thanks in advance

Nagaraju

Data connection wizard

lildiapaz25-Jun-07 15:03

lildiapaz

25-Jun-07 15:03

Hi,

I'm writing a C# windows application program that needs to connect to the SQL server 2000 or SQL 2005. What i want to do is when the user selects to connect to the server, a pop-up window appears that opens the data connection wizard where the can go through the wizard and connect to the sql servers are any other servers. Is this possible? If so, can someone please tell me how to do this?

Re: Data connection wizard

nitikin2-Jul-07 1:27

nitikin

2-Jul-07 1:27

Prompt the user for the server,Database,username, password. Prepare the connection string internally, connect using SqlConnection.

For enumerating the list of database, servers, use DMO or the new variant SMO

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

Memory management and memory leaks

Giorgi Dalakishvili25-Jun-07 8:55

Giorgi Dalakishvili

25-Jun-07 8:55

Hello,
Do you know a good resource which would describe possible situations that can leed to memory leaks? such as eventhandlers to objects that are no more needed and forms that aren't disposed after closing. Any article that would describe such situations and how to prevent them? Thanks

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