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Problem with Drag-Drop operation with Picture Box.Pls Help

Chintan.Desai7-Jun-07 0:05

7-Jun-07 0:05

Hi All,
I am been stuck with Drag-Drop operation in C#.I wanna to click on picture1,move it and dropped on picture2.but Drag_Enter event for picture2 does not fired at all. I have seek many topics but not got any any idea!!. I m bit confus with DoDragDrop().Pls tell something about e.Effect and e.Data.GetDataPresent(). I am been stuck with my project. from last 3 days. pls pls help me!!! Confused | :confused:

Regards
Chintan
www.visharadsoft.com
(Nothing is so purify as KNOWLEDGE)

Re: Problem with Drag-Drop operation with Picture Box.Pls Help

Muammar©7-Jun-07 0:29

Muammar©

7-Jun-07 0:29

1. Replace your PictureBox with a panel control and set it's background image to the picture you want.. "that should do the trick nicely!"
2. Enable the panel "Allow Drop" property by setting it to true ie. Panel1.AllowDrop = true;
3. Enable the destination's AllowDrop property as well.
4. In the destination's drag over, set the effect e.Effect = DragDropEffects.Move; Move/Copy/All/None.. etc.
5. If you want to say drag a file(s) use this:

private void listBox1_DragDrop(object sender, DragEventArgs e)
{
    string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
    foreach (string file in files)
    {
        ////////
        try
        {
        if (!listBox1.Items.Contains(file))
        listBox1.Items.Add(file);
        listBox1.SelectedIndex = listBox1.Items.Count - 1;
        }
        catch (Exception ex)
        {
            MessageBox.Show("Cannot find "+file, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
     }
}

Smile: A curve that can set a lot of things straight!
(\ /)
(O.o)
(><)

Re: Problem with Drag-Drop operation with Picture Box.Pls Help [modified]

Chintan.Desai7-Jun-07 0:49

Chintan.Desai

7-Jun-07 0:49

Thanks for ur reply,
i hav done the same thing as wht u tol,but friend when i click on dragged picture box (picturebox1)which i need to move,its not moving on MouseMove event(if i dont write DoDragDrop() in mouseMove it will work fine.I have written code to move picturebox1 according to mouse position).Only mouse get moved and then after taking mouse over panel1,Panel1_DragEnter is fired.But i want panel to know that it is picturebox1
my code snippet.it will give u some info.

private void picturebox1_MouseMove(object sender, MouseEventArgs e)
{
DagDropEffects ddEffect = picturebox1.DoDragDrop(picturebox1, DragDropEffects.Move);
if (ddEffect == DragDropEffects.Move)
{
//then move the mouse else dont move it
}
}

//Code in target picture box Drag_Enter event
private void picturebox2_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Bitmap))
//then it is valid control
else
//not valid so dont allow to drop on target picture box
}

pls reply

-- modified at 6:54 Thursday 7th June, 2007

Regards
Chintan
www.visharadsoft.com
(Nothing is so purify as KNOWLEDGE)

System.EnterpriseServices.TransactionProxyException

livez7-Jun-07 0:03

livez

7-Jun-07 0:03

Hello!

All of a sudden I get this exception when I try to update my database:

Exception of type 'System.EnterpriseServices.TransactionProxyException' was thrown.<br />
<br />
The transaction has aborted.

I haven´t found any info on this error anywhere, does anyone know whats usually causing this type of error and what I should do / look for in order to fix it?

/regards

using array list

tauras816-Jun-07 23:57

tauras81

6-Jun-07 23:57

how to use array list in c#.net

Re: using array list

Chintan.Desai7-Jun-07 0:10

Chintan.Desai

7-Jun-07 0:10

It is as simple as using array in any language.Actually ArrayList is use to get Array of object(class,structure) also array of int,string...Just declare its object in one method,luk at following code snippet.

private void fun()
{
Arraylist aList=new ArrayList();
//Array of Picturebox object.
PictureBox[5] pic=new PictureBox();

Now loop it with for loop
aList.Add(pic[i]);
}

This way you can do as many operation with picture box object.such as count no. of item in array list and many more...
Hop i have solve ur doubt.

nJoy C# Rose | [Rose]

Regards
Chintan
www.visharadsoft.com
(Nothing is so purify as KNOWLEDGE)

Re: using array list

Niiiissssshhhhhuuuuu7-Jun-07 0:12

Niiiissssshhhhhuuuuu

7-Jun-07 0:12

Hello,

Please click here[^]

Regards

,
Nishu

Allergic...

CPallini7-Jun-07 0:12

CPallini

7-Jun-07 0:12

Allergic to documentation? Mad | :mad:

See here [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

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?!

Upcoming events:
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My website

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:

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
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
"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 )

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

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