C# Discussion Boards - CodeProject

Allergic...

CPallini7-Jun-07 0:12

CPallini

7-Jun-07 0:12

Allergic to documentation? Mad | :mad:

See here [^].
Smile | :)

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Re: using array list

Manas Bhardwaj7-Jun-07 0:35

Manas Bhardwaj

7-Jun-07 0:35

From where did you read about this.
This is never gonna work. Mad | :mad:

Re: using array list

Colin Angus Mackay7-Jun-07 3:16

Colin Angus Mackay

7-Jun-07 3:16

Manas Bhardwaj wrote:
From where did you read about this.
This is never gonna work.

What?!

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Re: using array list

Dave Kreskowiak8-Jun-07 10:20

Dave Kreskowiak

8-Jun-07 10:20

Did you get hit in the head with a brick recently?
Confused | :confused:

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Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

insert element in array

tauras816-Jun-07 23:46

tauras81

6-Jun-07 23:46

how can insert element into the existing array in c#.net

Re: insert element in array

User 66586-Jun-07 23:48

User 6658

6-Jun-07 23:48

If you have a fixed array, then by index, like that:

arr[3] = 5;

Or, if you want an array of dynamic size, then use a List<T> so you can just do list.Add(5).

regards

modified 12-Sep-18 21:01pm.

Re: insert element in array

Colin Angus Mackay6-Jun-07 23:49

Colin Angus Mackay

6-Jun-07 23:49

Arrays are fixed length. You can replace an existing element, but you cannot insert one. You need an ArrayList or some other collection that supports inserting.

Re: insert element in array

Manas Bhardwaj6-Jun-07 23:52

Manas Bhardwaj

6-Jun-07 23:52

Hi,
In C#, the arrays can not be resized dynamically.
So, please keep this point in your mind. If you want to insert items in an array, better chice would be an ArrayList.
Another solution is to re-allocate the array with a different size and to copy the contents of the old array to the new array.

Re: insert element in array

tauras817-Jun-07 0:01

tauras81

7-Jun-07 0:01

HOW can we use array list in c#.net

Re: insert element in array

Manas Bhardwaj7-Jun-07 0:22

Manas Bhardwaj

7-Jun-07 0:22

See here
http://msdn2.microsoft.com/en-us/library/system.collections.arraylist(vs.71).aspx

Wink | ;)

Thread.Start : OutOfMemory exception

InfoTdl6-Jun-07 23:46

InfoTdl

6-Jun-07 23:46

The framework :
=============
C# .Net1.1, under visual studio 2003
We are developped a client-server using System.Runtime.Remoting functionnalities.
At "new loading" message receiption, we launch a thread to handle the new loading.
becaus of memory problems server(console application),
we added to regular intervals a call to
SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1) ;
and all our objects implement a Dispose class with SuppressFinalize call.
GC.SuppressFinalize(this);

It seems to work, when you look at the process manager, the used memory % stays betwenn 7 and 10Mo...

The Problem
===========
we need to add a new capability to our server, and we detect the following problem :
on Thread.Start we catch "OutOfMemory" exception. and our server is blocked Cry | :((

With a simulation program which sends messages to the server and write all 5 minutes the server process state, here this is that we obtain :
07/06/2007 10:14:38 NbThreads=15 VMem=138 428 416
UserProcTime=00:00:00.3593750 TotalProcTime=00:00:00.9375000
PrivateMem=17203200
07/06/2007 10:19:38 NbThreads=22 VMem=442 904 576
UserProcTime=00:00:02.7343750 TotalProcTime=00:00:06.7812500
PrivateMem=30269440
07/06/2007 10:24:38 NbThreads=21 VMem=715 534 336
UserProcTime=00:00:04.3906250 TotalProcTime=00:00:11.7812500
PrivateMem=37363712
07/06/2007 10:29:38 NbThreads=22 VMem=1 002 844 160
UserProcTime=00:00:06.2031250 TotalProcTime=00:00:17.3593750
PrivateMem=44703744
and it grows up until VMem is equal to 2 000 000 000 and we got outofmemory exception.
(Vmem = Process.VirtualMemorySize, UserProcTime = Process.UserProcessorTime, TotalProcTime = Process.TotalProcessorTime
et PrivateMem =Process.PrivateMemorySize

As our server is a console application with threads and because Microsoft (support.microsoft.com : article 828988) recommands the multithreading using
I try to use :
[MTAThread]
static void Main
But, it doens't help...

My Question
==============
Is anyone can explain me where is my problem and how can i resolve it?

Re: Thread.Start : OutOfMemory exception

InfoTdl15-Jun-07 0:56

InfoTdl

15-Jun-07 0:56

Maybe with more details someone will help me Smile | :)

After using MemProfier and CLR tools I've seen that :
Virtaul memory seems allocated in dataBase.open call :

To give an idea of my code :
using System.Data.Odbc;

OdbcConnection oConn = new OdbcConnection(...);
OdbcCommand oCmd = MyFunctiontoCreateCmd(..);
oConn.Open();
... oCmd.Execute(); ...
oConn.Close();
oConn.dispose();
oConn = null;
I use Firebird 1.5.3.4870, OdbcDriver 1.2.0.69
I don't understand if my problems come from C# dll or firebird ones.
MemProfiler tells me that UnsafeNativeMethods.Odbc32.SQLDriverConnectW calls unmaned code...

(To follow...)

Re: Thread.Start : OutOfMemory exception

InfoTdl17-Jun-07 22:24

InfoTdl

17-Jun-07 22:24

I made another test : only odbcconnection creation.
Open, then Close...

but also memory leak !

pb C# (odbc) or firebird driver ?

Here's my code :

public void DirectLoopNoThread()<br />
{<br />
	Process aProcess = null;<br />
	int i = 0;<br />
			<br />
	while (m_bNotStop)<br />
	{<br />
		OdbcConnection oConn = new    OdbcConnection("DSN=CHGT_SECAB");<br />
		oConn.Open();<br />
		oConn.Close();<br />
		//Free Memory ?<br />
		oConn.Dispose();<br />
		oConn = null;<br />
		System.Threading.Thread.Sleep(1000);<br />
		i++;<br />
		if (i == 50)<br />
		{<br />
			i=0;<br />
			aProcess =  Process.GetCurrentProcess();<br />
			Trace.WriteLine(DateTime.Now.ToString() + " TestDb :"  <br />
				+ " VMem=" + aProcess.VirtualMemorySize<br />
				+ " PrivateMem=" + aProcess.PrivateMemorySize);<br />
			aProcess.Dispose();<br />
			aProcess = null;<br />
			GC.Collect();//2) ;<br />
			aProcess =  Process.GetCurrentProcess();<br />
			Trace.WriteLine(DateTime.Now.ToString() + " TestDb : GC.Collect"); <br />
			Trace.WriteLine(DateTime.Now.ToString() + " TestDb :"  <br />
				+ " VMem=" + aProcess.VirtualMemorySize<br />
				+ " PrivateMem=" + aProcess.PrivateMemorySize);<br />
			aProcess.Dispose();<br />
			aProcess = null;<br />
				SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1) ;<br />
			aProcess =  Process.GetCurrentProcess();<br />
			Trace.WriteLine(DateTime.Now.ToString() + " TestDb : GC.SetProcessWorkingSetSize"); <br />
			Trace.WriteLine(DateTime.Now.ToString() + " TestDb :"  <br />
				+ " VMem=" + aProcess.VirtualMemorySize<br />
				+ " PrivateMem=" + aProcess.PrivateMemorySize);<br />
			aProcess.Dispose();<br />
			aProcess = null;<br />
		}<br />
	}<br />
}

This is the obtained traces :
====================
18/06/2007 09:48:50 TestDb : DirectLoopNoThread
18/06/2007 09:49:41 TestDb : VMem=179871744 PrivateMem=12541952
18/06/2007 09:49:43 TestDb : GC.Collect
18/06/2007 09:49:43 TestDb : VMem=179871744 PrivateMem=12673024
18/06/2007 09:49:43 TestDb : GC.SetProcessWorkingSetSize
18/06/2007 09:49:43 TestDb : VMem=179871744 PrivateMem=12673024

18/06/2007 09:51:26 TestDb : VMem=288923648 PrivateMem=15372288
18/06/2007 09:51:26 TestDb : GC.Collect
18/06/2007 09:51:26 TestDb : VMem=288923648 PrivateMem=15372288
18/06/2007 09:51:26 TestDb : GC.SetProcessWorkingSetSize
18/06/2007 09:51:26 TestDb : VMem=288923648 PrivateMem=15372288

String length in pixels

jain.ashish216-Jun-07 23:40

jain.ashish21

6-Jun-07 23:40

I want to know the length of string in pixels in a web based applicaiton. can anyone tell me how can i get it..?

If my mind can conceive it, and my heart can believe it, I know I can achieve it.

Re: String length in pixels

Christian Graus6-Jun-07 23:51

Christian Graus

6-Jun-07 23:51

Please don't cross post.

In a web app, you really can't as you have no way of dealing with the font settings on the browsers your users have set. But, if you set absolute font sizes, you can use Graphics.MeasureString on the server, and assume they will be the same size on the client. It's definately better form to use relative sizes ( which means you can't do that )

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Re: String length in pixels

jain.ashish217-Jun-07 0:02

jain.ashish21

7-Jun-07 0:02

I am setting the font size on the server only but still I cannot use Graphics.MeasureString since it requires PaintEventArgs which cannot be used in Web projects. If it can still be used do u have any sample code to get the length in pixels which u can pls post it here.

If my mind can conceive it, and my heart can believe it, I know I can achieve it.

Re: String length in pixels

DavidNohejl7-Jun-07 0:10

DavidNohejl

7-Jun-07 0:10

jain.ashish21 wrote:
l I cannot use Graphics.MeasureString since it requires PaintEventArgs

No it does not. Try Graphics.FromImage().

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Dropdownlist

sneha016-Jun-07 23:14

sneha01

6-Jun-07 23:14

I have a dropdown list box which has 4 ListItems in it . I want that when a user selects any item from dropdown list its index value should go in database table .
Suppose DropDownList has 4 values such as a, b , c , d . If user selects any of the value in dropdown list then the database should have value as 1 for a , 2 for b and so on ....

Thanks in Advance

Re: Dropdownlist

Manas Bhardwaj6-Jun-07 23:48

Manas Bhardwaj

6-Jun-07 23:48

Sneha,
You can use SelectedValue property for this.
For display puropse, you should use SelectedItem and when you are dealing with database, update it with SelectedValue.
Success!!!

Re: Dropdownlist

Manas Bhardwaj7-Jun-07 0:31

Manas Bhardwaj

7-Jun-07 0:31

Sneha,
You can use SelectedValue property for this.
For display puropse, you should use SelectedItem and when you are dealing with database, update it with SelectedValue.
Success!!!

Re: Dropdownlist

sneha017-Jun-07 1:23

sneha01

7-Jun-07 1:23

I m still not getting it can u show me hint code .

Calling a Method with the Method Name In A String

Projjal6-Jun-07 23:11

Projjal

6-Jun-07 23:11

Is it possible to evaluate a string as a method name?

Something like this:

string methodName = "Login";

invoke(methodName())

Anyone have any ideas?

- Projjal

Re: Calling a Method with the Method Name In A String

Colin Angus Mackay6-Jun-07 23:19

Colin Angus Mackay

6-Jun-07 23:19

See the documentation for the System.Reflection namespace. And also for the class Type.

Use the Type to find the MethodInfo and call Invoke on the MethodInfo object.

Re: Calling a Method with the Method Name In A String

DavidNohejl6-Jun-07 23:20

DavidNohejl

6-Jun-07 23:20

Yes, you can do this with Reflection. For a start, http://www.google.com/search?q=methodinfo.invoke[^]

File Access on Remote Computers

Mats Eurén6-Jun-07 22:50

Mats Eurén

6-Jun-07 22:50

Hi!

I'm looking for an example on how to program file access on remote computers.

I know the path (share), filename, the username and password on the remote computer, but I don't know how to program the access control.

I saw a post in another forum on the internet where someone suggested to use the NET USE command. To me, that doesn't look like the ultimate solution. I read somewhere about Generic prinipals? But there are no examples whatsoever on how to do it?!

Does anyone have any experience with that?

Regards Mats

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