Re: This program will self destruct in 10 sec....??? - C# Discussion Boards

Tristan Rhodes18-Jul-05 13:53

18-Jul-05 13:53

Is a static object unique the the application compartment it is contained in? Or if you have 2 identical applications running, will they share the same static object?

I'm guessing it's independant. But i just need to check.

Cheers

Cata

Re: Static Objects - Stupid Question

leppie19-Jul-05 0:27

leppie

19-Jul-05 0:27

static instances are contained on a per AppDomain basis. But I think you can have on a per thread basis too, but im not sure how, and/or why.

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ListView and VScrollBar.

93Current18-Jul-05 13:36

93Current

18-Jul-05 13:36

Hi @all,

I have a ListView and a VScrollBar (I need the Scroll event...) on it with ListView.Scrollable set to false, because the ListView's ScrollBar would be on top always, so that I could not access my VScrollBar. But my problem is: How can I access the ListViewItems that are not visible? I tried to call the EnsureVisible() method at the Scroll event . The result was: The VScrollBar scrolled but the ListViewItems that are not visble didn't scrolled into view. It seems to be that the EnsureVisible() method only take effect if ListView.Scrollable is set to true. It must be a simple work - it drives me crazy! Please help!

Re: ListView and VScrollBar.

Christian Graus18-Jul-05 13:45

Christian Graus

18-Jul-05 13:45

If you make your control not scrollable, it won't scroll. I doubt there is a simple way around this, it's doing what you asked it to.

Christian Graus - Microsoft MVP - C++

Re: ListView and VScrollBar.

Jano Petras18-Jul-05 14:36

Jano Petras

18-Jul-05 14:36

It could be possible to modify control styles to get rid of the scroll bar - must be done through interop though (calling into Win32 API) and still have control thinking it is there (by setting scrollbar's visible to false or similar). I don't think it is too easy as I had a lot of hard time fidling around ListView - it has a lot of strange behaviours under .NET (did you know it is owner-drawn under .NET at all times?)

Regards
JP

Solution is very simple!

93Current19-Jul-05 9:14

93Current

19-Jul-05 9:14

[DllImport("user32.dll")]
static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow);

the call...

ShowScrollBar(listView1.Handle, 1, false);

...works!

Sebastian.

This program will self destruct in 10 sec....???

WetRivrRat18-Jul-05 12:22

WetRivrRat

18-Jul-05 12:22

Has anyone created a method to self-destruct a program yet? Screw all the timed licenses and date-diffs, I want my program to just disapear at xxx time and not be recoverable. end of story! done deal!!!

any ideas?

any takers?
Laugh | :laugh:

Dim Beautiful As String
Beautiful = "ignorant"
Label1.Text = "The world is full of " & Beautiful & " people."

Why is common sense such an un-common comodity?

Re: This program will self destruct in 10 sec....???

Christian Graus18-Jul-05 13:07

Christian Graus

18-Jul-05 13:07

Yeah, that's easy. You need a second program whose sole job is to delete the first. Then put it in the runonce section of the registry, and it will be deleted the next time the user starts their machine.

Christian Graus - Microsoft MVP - C++

Re: This program will self destruct in 10 sec....???

Luis Alonso Ramos18-Jul-05 15:34

Luis Alonso Ramos

18-Jul-05 15:34

See this[^] page.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

SNMP

palwhatsup18-Jul-05 12:13

palwhatsup

18-Jul-05 12:13

Does anybody know if there is a SNMP simulator in C# out there?
Any help would be appreciated!

Thanks!

Re: SNMP

leppie19-Jul-05 0:32

leppie

19-Jul-05 0:32

All NT-based OS version 4+ supports it as clients. Obviously you just want the server software. They are expensive.

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deSerialization is slow why?

erdsah8818-Jul-05 11:48

erdsah88

18-Jul-05 11:48

I have serialized my bussiness objects to a file and tried to deserialize them
but it took so much time that creating those objects and putting data into them from database is even faster.

Am I missing any thing?I have though that the deserialization process for my objects from a file should be much much faster as I do not have to create the objects?

MY CODE
***********************
public static void SerializeIdentityMapRegistry()
{
System.IO.Stream s = System.IO.File.OpenWrite(@"C:\Documents and Settings\dogat.ILKON\Desktop\imap.dat");
BinaryFormatter b = new BinaryFormatter();
b.Serialize(s, DAL.identityMap.IdentityMapRegistry.getInstance());
s.Close();
}

public static void DeserializeIdentityMapRegistry()
{
System.IO.Stream s = System.IO.File.OpenRead(@"C:\Documents and Settings\dogat.ILKON\Desktop\imap.dat");
BinaryFormatter b = new BinaryFormatter();
DAL.identityMap.IdentityMapRegistry.Instance = (DAL.identityMap.IdentityMapRegistry)b.Deserialize(s);
s.Close();
}

Re: deSerialization is slow why?

Robert Rohde18-Jul-05 18:42

Robert Rohde

18-Jul-05 18:42

First of all:
No .Net serialization isn't very fast. Almost ever you will be by far faster if you (as an example) write a binary file yourself. But this surely means you have to do the major work yourself.

To your problem:
Check your DAL.identityMap.IdentityMapRegistry for unneeded references. Keep in mind that every reference this class holds gets also serialized (and those who are referenced by those which are referenced...). It's a very common mistake that just too much gets serialized - so check it carefully.

Re: deSerialization is slow why?

leppie19-Jul-05 0:40

leppie

19-Jul-05 0:40

Also as the other reply said, but make the instance of the BinaryFormatter static, so that doesnt have to be recreated.

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Twain return bitmap

baskota18-Jul-05 9:53

baskota

18-Jul-05 9:53

I'm using the articl of Twain published on the codeproject, but i have alittle problem which is:

the reutrn datatype is IntPtr, which i can't convert to a bitmap.

what can i do?

Re: Twain return bitmap

Judah Gabriel Himango18-Jul-05 10:38

Judah Gabriel Himango

18-Jul-05 10:38

Is the IntPtr a GDI bitmap handle? If yes, look at the System.Drawing.Bitmap.FromHbitmap static method.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Homosexuality in Christianity
Judah Himango

combo box on a windows form

sea#18-Jul-05 8:01

sea#

18-Jul-05 8:01

I'm trying to use a combo box on a windows form which will change its display on event of changing combo selection. This is the method I wrote:

private void SurveyChooserCombo_SelectedIndexChanged(object sender, EventArgs e)
		{
			DAL dal = new DAL();
			switch (SurveyChooserCombo.SelectedIndex)
			{
				case 0:
					SrNo = 1;
					break;
					
				case 1:
					SrNo = 2;
					break;

				case 2:
					SrNo = 3;
					break;
				default:
                   SrNo = 3;
					break;
			}

It doesn't do the job.
Please help me find why.

TIA,

sea#

Re: combo box on a windows form

Judah Gabriel Himango18-Jul-05 8:57

Judah Gabriel Himango

18-Jul-05 8:57

What is SrNo? What do you want to change in the combo box?

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Homosexuality in Christianity
Judah Himango

Re: combo box on a windows form

User 665818-Jul-05 8:59

User 6658

18-Jul-05 8:59

"doesn't do the job" is very vague, what doesn't work in particular?

modified 12-Sep-18 21:01pm.

Re: combo box on a windows form

sea#18-Jul-05 9:30

sea#

18-Jul-05 9:30

SrNo, which is an int represents survey no. Each time I change the item in combo, it is changed.
"doesn't do the job" means SurveyChooserCombo.SelectedIndex seems to be left unchanged.
When I run the application the form doesn't change the display as expected.
Also cannot run it in debug mode, as I get "there is no source code available for current location", when trying to run over method more then once- to make the change in index come true.

sea#

Re: combo box on a windows form

Jano Petras18-Jul-05 14:33

Jano Petras

18-Jul-05 14:33

Are you sure you have added event handler?

i.e.
comboBox.SelectedIndexChanged+=new SelectionChangeHandler(<<your method>>)

???

This is done automatically by Visual Designer - simply naming method SurveyChooserCombo_SelectedIndexChanged does not automatically associate it with the control...

- Another possibility is that the event may not be fired if combo box list style is not a selection from drop-down list but a mixture of type-in and select from the list...

Hope this helps.

Regards
JP

Re: combo box on a windows form

sea#18-Jul-05 20:14

sea#

18-Jul-05 20:14

Petras J. wrote:
Are you sure you have added event handler?

i.e.
comboBox.SelectedIndexChanged+=new SelectionChangeHandler(<<your method="">>)

???

I do have event handler.

Petras J. wrote:
- Another possibility is that the event may not be fired if combo box list style is not a selection from drop-down list but a mixture of type-in and select from the list...

it is just an ordinary drop-down list. Nothing complicated.

What else should I do to make it change once selction changed?

TIA,

sea#

Re: combo box on a windows form

sea#18-Jul-05 22:06

sea#

18-Jul-05 22:06

Wrote this code:

private void SurveyChooserCombo_SelectedIndexChanged(object sender, EventArgs e)
		{
			if (SurveyChooserCombo.Text.Equals("Survey1"))
				SrNo = 1;
			else if (SurveyChooserCombo.Text.Equals("Survey2"))
				SrNo = 2;
			else if (SurveyChooserCombo.Text.Equals("Survey3"))
				SrNo = 3;
			else
				SrNo = 3;
			GetResults (SrNo);
		}

stil event is not fired, dsiplay doesnot changed.

Row in DataSet

zaboboa18-Jul-05 7:29

zaboboa

18-Jul-05 7:29

Hello,

How can I update the specific row in the dataset, where the
row["ProjectID"] == someValue1 and row["VersionNumber"] == someValue2.
I don't want to loop through the whole dataset using foreach statement.
So, what would be the notation for such operation?

Thank you

Re: Row in DataSet

Not Active18-Jul-05 7:54

Not Active

18-Jul-05 7:54

You could use DataSet.Table.Select to retrieve the row then update it.

DataRow[] rows = ds.tables[0].select("projectID=? and VersionNumber=?, "ASC");

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