.NET (Core and Framework)

Localization for edit EditorZone

25-Aug-05 7:15

You have to override the forms OnLoad procedure. You can set the forms Opacity to 0 in there. Then later, when you want to show the form, set the Opacity to 1.

' In VB.NET,
Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
    MyBase.OnLoad(e)
 
    ' Make me disappear before I'm even shown...
    Me.Opacity = 0
    Me.Visible = False     ' WON'T WORK!
End Sub

Now when you want to show the form, just set the Opacity back to 1.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Anonymous25-Aug-05 0:37

Anonymous

25-Aug-05 0:37

I have to localize property display name i.e WebDisplayName of webpart .How to do it in ASP.NET 2.0?

NumericUpDown Problem

wjr-itt24-Aug-05 12:17

wjr-itt

24-Aug-05 12:17

Try this simple test:

Drop a NumericUpDown control (nud1) and a Button (b1) on a form. Make sure that nud1.DecimalPlaces is set to 0. In the Click handler of b1, display the value of nud1 by doing MessgeBox.Show(nud1.Value.ToString()). Run the application and type 4.513 in nud1 and click b1. The MessageBox will display 4.513 as the value, but nud1 will contain 5. Now click the up arrow of nud1 and then click b1. The MessageBox will now display 5.513 and nud1 will contain 6. If you type a new value, say 17, into nud1, the decimal places will go away. The same type of problem shows up if you set nud1.DecimalPlaces to 3 and type 7.12345 in nud1 (the extra decimal places hang around).

You can get around this by using the NumericUpDown.Text property (it always gives the correct value). However, studio does not show this property in the properties window and it does not appear when performing a ‘code complete’ when typing. The Text property is an overridden property of UpDownBase.

This appears to be a big problem since all of the msdn examples for NumericUpDown use the Value property to retrieve the value of a NumericUpDown. Does anyone have any comments/opinion?

Thanks …

wjr@itt WTF | :WTF:

Re: NumericUpDown Problem

wjr-itt25-Aug-05 4:01

wjr-itt

25-Aug-05 4:01

I discovered a problem with my workaround of using the Text property of the NumericUpDown to retrieve the correct value that is displayed by the control. In my simple example that I posted, accessing .Text worked fine. In my real, more complex app, accessing .Text in the button click handler caused the NumericUpDown to continue to display the wrong value (wrong number of decimal places) and the value returned by .Text was incorrect too. My workaround for this was to create a Validated handler for the NumericUpDown that did nothing more than assign the Value attribute to a variable and do nothing else with it. As long as .Value is accessed before anything else accesses .Text, things seem to be OK.

wjr@itt OMG | :OMG:

Converting bitmaps to stdole picture

gorp12324-Aug-05 9:33

gorp123

24-Aug-05 9:33

Hello everyone,

I am currently using an ActiveX(COM) object in a .NET application. The image list for the COM control requires a stdOle picture, however, converting a .NET bitmap image to a stdOle picture is proving to be a bit of a hassle. Can anyone provide any info as to how I can convert the .NET image over to an stdOle stdPicture object so I can insert it into the COM image list? Any help would be appreciated.

Jay

Out of memory unhandled exception

Silberztein23-Aug-05 14:37

23-Aug-05 14:37

Hello,

I have a PC with 2GB RAM, Windows XP and .NET 1.1 framework. My .NET application has huge memory requirements.

It crashes (ignoring my try/catch) because of an "unhandled out of memory exception", when it uses approx. 2GB RAM of pure RAM memory. (says the Windows Taks Manager, Performance, Physical Memory).

As I did set Windows XP (Control Panel - System - Advanced - Advanced - Virtual Memory - 2047 MB) to use 2extra GBRAM of virtual memory on my hard disk, it looks like .NET does not follow Windows, and refuses to use the extra virtual memory.

(1) Is there some kind of default (Windows XP or .NET) that I should know of, that will allow my application to use more memory than the physical 2GB RAM ?

(2) Is there any way to programmatically tell .NET that I will use virtual memory, instead of physical memory?

--Max

Steve Pullan23-Aug-05 14:54

Steve Pullan

23-Aug-05 14:54

Max,

There should be no practical difference between virtual and real memory usage. What you are probably seeing is that even though there is a 4GB programming address space in XP, only 2GB is ever available to any application - the other 2GB is for the o/s.

You can change this with a startup option (I think it is /3GB) which will increase the address space available to non-o/s programs to 3GB and reduce the o/s address space accordingly to 1GB. You'll need to look this up on Google/Microsoft etc for the exact syntax and further info.

Having said that, I would be attempting to use much less memory by storing data on disk in a database etc. Maybe your application must use memory, maybe not? It's worth considering anyway.

...Steve

Silberztein23-Aug-05 17:24

23-Aug-05 17:24

Steve,

I used the /3GB startup option to launch Windows XP, but the "Out of Memory" exception fires exactly at the same time, i.e. when the program uses 2GB RAM Physical Memory (as told by Windows Task Manager / Performance / Physical Memory).

Is there anything else I have to do to get more than 2GB RAM of data under .NET ?

Max

Steve Pullan23-Aug-05 18:27

Steve Pullan

23-Aug-05 18:27

Max,

I found a hit via Google on this problem...

Google is my friend

Basically you may be hitting a threshold limit for the ArrayList structure so even if you give it more memory there is no guarantee that it will use it all.

I strongly suggest that you look at virtualizing this data because even if you do somehow happen to get it running with 3GB memory, you may find that just one small change to the input will push the limits again.

Another approach may be to limit the size of each list entry by compressing each entry so that the ArrayListitself uses less memory.

...Steve

Silberztein24-Aug-05 7:51

24-Aug-05 7:51

Steve,

Do you think that even if I get a Windows 64 machine with 16GBRAM or more, I will have access only to 2GB RAM data for each .NET object(ArrayList, Hashtable, etc.) ?

What about pure arrays: are they limited too to the int32 limitation?

Will .NET 2.0 fix this ?

Now for my problem: actually I did not realize how expensive using ArrayList is...

Each of the 15 million+ State are very small; probably 90% have less than 2 outgoing transitions.

I replaced the embedded ArrayList {char,int,char,int...} with two synch pure arrays char[] and int[], and now the whole thing gets stored in approx. 600 MB, which is fine (for now).

Thanks
Max

Dave Kreskowiak23-Aug-05 14:58

23-Aug-05 14:58

There's nothing "tunable" or configurable as far as the .NET memory manager is concerned.

Also, running the system out of handles can also cause the same problem. If you'r not freeing an unmanaged resource or not Disposing of some types of objects properly, you'll run into the same problem.

What are you using that's taking up all this memory?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Silberztein23-Aug-05 15:19

23-Aug-05 15:19

I have a Hungarian dictionary (several dozen millions of word forms) that I need to store into a Search tree.

The search tree is basically an ArrayList of states; each state has the following fields:

public class DState
{
ArrayList CharsToDests;
int infonb;
int canonical;
(... and then the methods)
}

in which CharsToDests contains alternatively characters, and their corresponding outgoing state index, e.g.:

('a',23,'b',3456,'c',1200023,'d',57)

For some reason I don't understand, my ANTS profiler says each state consumes 20 bytes (I would have thought 4x3 = 12).

BTW, do you know how much memory such an ArrayList takes? would it be better to use two synchronized type-consistent ArrayList, e.g.:

ArrayList Characters;
ArrayList OutgoingStateNb;

or something else (I cannot use an array because these lists grow: I just need a list of chars and a list of int).

Anyways, after having stored 5 million words,
that gives me approx. 50 million states, with the connections in the Arraylist => I get approx. 2GBRAM and then the Out of Memory exception (that I cannot catch).

--Max

Steve Pullan23-Aug-05 15:31

Steve Pullan

23-Aug-05 15:31

Sounds like you need to use a database rather than in-storage arrays.

...Steve

Dave Kreskowiak24-Aug-05 6:10

24-Aug-05 6:10

Silberztein wrote:
('a',23,'b',3456,'c',1200023,'d',57)

For some reason I don't understand, my ANTS profiler says each state consumes 20 bytes (I would have thought 4x3 = 12).

Did you also account for the boundry padding between fields and array elements?

Also, an ArrayList, or any other array for that matter, can only be indexed by a 32 bit integer and, therefore, can only hold a maximum of Int32.MaxValue, which is about 2.147 billion, elements. Try and exceed this limit, and you'll get an OutOfMemory exception.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Silberztein24-Aug-05 8:00

24-Aug-05 8:00

> Also, an ArrayList, or any other array for that
> matter, can only be indexed by a 32 bit integer
> and, therefore, can only hold a maximum of
> Int32.MaxValue, which is about 2.147 billion,
> elements. Try and exceed this limit, and you'll
> get an OutOfMemory exception.

is this limit also true for Windows 64?
for .NET 2.0 ?

--Max

Dave Kreskowiak24-Aug-05 11:22

24-Aug-05 11:22

Don't know. I would suspect the indexer limit would be the same size as the processor data width.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Silberztein24-Aug-05 7:57

System.Diagonastics.Process.GetProcesses throws error if the user does not have admin rights.

24-Aug-05 7:57

> What are you using that's taking up all this memory?

I was using an array of 15 million states:

public class State
{
ArrayList transitions; // {char,state,char,state...}

int infonb;
int canonicalstate;
}

I did not realize how expensive the ArrayList is. Since most states have less than 2 outgoing transitions, I replaced the arraylist with two synch pure arrays:

public class State
{
char[] char;
int[] targetstate;
int infonb;
int canonicalstate;
}

and that came to 1/3 of the previous memory usage.

--Max

manivannan.p23-Aug-05 5:16

manivannan.p

23-Aug-05 5:16

Hi,

I get error
"Couldn't get process information from remote machine" when i try to run Process.GetProcesses().I understand that this is because i dont have administration rights.How can i solve this problem.Is there a way where in i can give some permissions to the user to execute that part of code alone.

Hope to get replies soon.
Thanks

Re: System.Diagonastics.Process.GetProcesses throws error if the user does not have admin rights.

Dave Kreskowiak24-Aug-05 6:11