Re: datagrid problem - C# Discussion Boards

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Cursor Dispose Problem

Keshav V. Kamat22-Jul-07 23:43

Keshav V. Kamat

22-Jul-07 23:43

Consider my code below

Cursor m_OldCursor;<br />
void OnCursorChanged(object sender, EventArgs e)<br />
{<br />
	if(m_OldCursor != null)<br />
	{<br />
		m_OldCursor.Dispose();<br />
	}<br />
	m_OldCursor = new Cursor(this.Cursor.CopyHandle());<br />
}<br />
<br />
void ProcessMouseMove(EventArgs e)<br />
{<br />
	// m_OldCursor is used here too. <br />
	// hence cannot be declared everytime in <br />
	// OnCursorChanged.<br />
}

I know it is wrong to use a object after it is disposed. but every single
time the CopyHandle() method is invoked, it creates a handle. since there
is a restriction on the number of handles that windows can manage, i need
to dispose this handle after its use. if not then the application will
crash. If instead of Cursor, it was a control then i could have used the DestroyHandle property.

Could you suggest me any other way to do the same.

thanks in advance.

Keshav Kamat Smile | :)

India

Re: Cursor Dispose Problem

Luc Pattyn23-Jul-07 2:01

Luc Pattyn

23-Jul-07 2:01

Hi,

two comments:

1.
you should not try to dispose of cursors that you did not create yourself;
that's every Cursor you get from the Cursors class (the system created those, it
will dispose of them too when appropriate, and maybe never !)

2.
who is changing the cursor ? cant you do that with a simple method, something like (inside
your form class):

public static void SetCursor(Cursor newCursor) {
     Cursor oldCursor=Cursor;
     Cursor=newCursor;
     oldCursor.Dispose();
}

no handles involved !

Hope this helps.

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Pdf File Creation

karthikeyanic22-Jul-07 23:32

karthikeyanic

22-Jul-07 23:32

How to create pdf file from reading the data from the dataset and directly convert to the pdf file.

Re: Pdf File Creation

blackjack215022-Jul-07 23:55

blackjack2150

22-Jul-07 23:55

iTextSharp is a free .NET PDF extension. But even with it, writing pdf files in .NET is not very easy. There are some articles here on CP about iTextSharp, and also other free libraries, but most of them with limited functionality.

Search the "Articles" section.

GL!

Re: Pdf File Creation

javid4u23-Jul-07 0:16

javid4u

23-Jul-07 0:16

Try CrystalReports... For creating PDF's its easy

datagrid problem

srinivassam22-Jul-07 23:28

srinivassam

22-Jul-07 23:28

hi all,
In my application iam using datagrid ,in that i want to do navigation but my code is not reflecting .and also i want to edit the row , how to do this
<pre>
private void DataGrid1_PageIndexChanged(object source,System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
DataGrid1.CurrentPageIndex =e.NewPageIndex ;
//DataGrid1.CurrentPageIndex = e.NewPageIndex;
String connection = "uid=sa; password=sa123; database=usermanagement; server=c113";

SqlConnection con= new SqlConnection (connection);
//SqlCommand cmd=new SqlCommand ("select * from tbl_user_management
SqlDataAdapter da=new SqlDataAdapter ("select * from tbl_user_management",con);
con.Open ();
DataSet ds=new DataSet ();
da .Fill (ds ,"tbl_user_management");
DataGrid1 .DataSource =ds.Tables[0];// ("tbl_user_management");
DataGrid1 .DataBind ();
con.Close ();

}
<pre>

srinivas

Re: datagrid problem

satsumatable23-Jul-07 0:33

satsumatable

23-Jul-07 0:33

Have you enabled Paging property in Properties?

Re: datagrid problem

srinivassam23-Jul-07 1:24

srinivassam

23-Jul-07 1:24

yes

srinivas

Which one to use?

Hum Dum22-Jul-07 23:09

Hum Dum

22-Jul-07 23:09

I really dont have any exp. in web development,
but have some knowledge abt building web pages in asp.net,

I want to know what is difference between web pages which r developed by asp.net and flash player?

Re: Which one to use?

Guffa22-Jul-07 23:32

Guffa

22-Jul-07 23:32

You can't use flash to create web pages. When you create a "web page" in flash, it's just a flash movie that you show as an embedded element in a web page.

---
single minded; short sighted; long gone;

Message Queue Manipulation

M. J. Jaya Chitra22-Jul-07 22:49

M. J. Jaya Chitra

22-Jul-07 22:49

Hai Everybody,
I want to queue some events in the message queue and it has to be retained even though the system is restarted. I have created a message queue as follows but it is not retaining the messages can any one give a solution to this please it is very very important and urgent.

<br />
                    private System.Messaging.MessageQueue eventMessageQueue;<br />
                    if (!System.Messaging.MessageQueue.Exists(System.Net.Dns.GetHostName() + @"\EM"))<br />
                    {<br />
                        try<br />
                        {<br />
                            eventMessageQueue = System.Messaging.MessageQueue.Create(System.Net.Dns.GetHostName() + @"\EM",true);<br />
                        }<br />
                        catch (System.Messaging.MessageQueueException messagingException)<br />
                        {<br />
                            schedulerClass.LogError(messagingException, "Scheduler Error", EventLogEntryType.Error);<br />
                        }<br />
                        catch (Exception generalException)<br />
                        {<br />
                            schedulerClass.LogError(generalException, "Scheduler Error", EventLogEntryType.Error);<br />
                        }<br />
                    }<br />
                    else<br />
                    {<br />
                        eventMessageQueue = new MessageQueue(System.Net.Dns.GetHostName() + @"\EM");<br />
                    }<br />

Best Regards,
M. J. Jaya Chitra

using user control

cyn822-Jul-07 22:04

cyn8

22-Jul-07 22:04

hi,
May i know how to allow shapes drawn(e.g using DrawRectangle) on a window form to be drag and drop to a user control dock on the left side of the form? Can somebody explain briefly the step to do it? So Any help is much appreciated.
Thanks

Threads and modules...

Arish rivlin22-Jul-07 22:04

Arish rivlin

22-Jul-07 22:04

Hi all
I cannot match between thread and process. Need to kill a cirtain thread, I know in general to what module the thread belongs but cannot distinct between the diffrent threads. all I get is a list of the threads ID that belong to my process....

Re: Threads and modules...

Stephen Hewitt22-Jul-07 22:14

Stephen Hewitt

22-Jul-07 22:14

Killing a thread is a bad idea in almost all cases. It can destabilise the entire process.

Steve

Re: Threads and modules...

Arish rivlin22-Jul-07 22:28

Arish rivlin

22-Jul-07 22:28

I know...... I have no choise. It's not my module.......

Re: Threads and modules...

Stephen Hewitt22-Jul-07 22:33

Stephen Hewitt

22-Jul-07 22:33

OK then, but it will end in tears!

Steve

Re: Threads and modules...

Arish rivlin23-Jul-07 0:16

Arish rivlin

23-Jul-07 0:16

Can I, at least, configure to what modoule does a cirtin thread belongs to?

Re: Threads and modules...

Luc Pattyn23-Jul-07 2:08

Luc Pattyn

23-Jul-07 2:08

No I dont think so.

AFAIK the managed threads are virtual, i.e. they are not even guaranteed to correspond to
a physical (i.e. a Windows kernel) thread.

This is somewhat illustrated by the fact that managed threads have a ManagedThreadId property,
whose value does not correspond to the kernel's thread IDs; and it has a name, for which
the kernel has no equivalent member at all.

In my experience, there still is a 1-to-1 correspondence between a managed thread and a
kernel thread, but I havent found any way to map them, other than having each managed thread
call some native code to get its own kernel thread ID that is.

Hope this clarifies things a bit.

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Line Object on Form with any coordinate- May be?

Doan Quynh22-Jul-07 21:57

Doan Quynh

22-Jul-07 21:57

I want to have a diagonal Line object as a usercontrol. It can automatic process events as click, drag and drop...Can you help me?
Thank a lot.

QuynhTD

How to include a DialogBox in a C#.Net at design time.

AmarjeetSinghMatharu22-Jul-07 21:39

AmarjeetSinghMatharu

22-Jul-07 21:39

Hello All,

I need to include a Dialog Box (Visual C++.Net or VC++6 style ) in a Visual C#.Net application at deign time but by default it is Form that is included and you can include by going to Add item.

Please suggest.

Thanks and Regards.
Amar.

Re: How to include a DialogBox in a C#.Net at design time.

satsumatable23-Jul-07 0:36

satsumatable

23-Jul-07 0:36

Do you want to include Dialog box which are created in VC++ ? Is it anything like MFC COM (ActiveX) controls ?

Re: How to include a DialogBox in a C#.Net at design time.

AmarjeetSinghMatharu24-Jul-07 23:39

AmarjeetSinghMatharu

24-Jul-07 23:39

No,
May it be created in C# and generated by the wizard as C# Form is.
Hope this clarifies.
Thanks.

using settings

baelzaden22-Jul-07 21:06

baelzaden

22-Jul-07 21:06

Hi,
I created a settings file using Visual Studio 2005. The class for the settings file is generated as internal by VS. I need to reach it from another namespace so I want to make it public not internal. Is it good to make a settings file public or does it have any bad effects?

Re: using settings

Guffa22-Jul-07 22:39

Guffa

22-Jul-07 22:39

As it is internal, it's available in the entire assembly, even from a different namespace.

If you need to use the information in another project in the solution, you get a mutual dependency if you access the settings directly. Instead you should send the needed information when calling the method, or creating the object instance, that needs it.

---
single minded; short sighted; long gone;

Re: using settings

ekynox22-Jul-07 22:47

ekynox

22-Jul-07 22:47

I believe the cs file in question is machine generated so its no point making changes to that. Why dont you write your own class which can traverse the settings file using the XML namespace.

try this CP article
http://www.codeproject.com/useritems/SystemConfiguration.asp

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