Check to see if object is being referenced - C# Discussion Boards

Running .NET application from Server Share

peterchen30-Dec-07 23:41

30-Dec-07 23:41

I'm at the old "Running .NET application from Server Share causes a security exception[^]"

Is the state of the art still "You HAVE to fiddle with the local security policy"?

I expected that it would be possible to get the generic XP security warning, and let the user continue, but I can't find any.

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Re: Running .NET application from Server Share

martin_hughes31-Dec-07 0:48

martin_hughes

31-Dec-07 0:48

A technique I've been playing with is to deploy the application as a "ClickOnce" app to a server share, but not make it available offline (so no start menu item is created on the users machine). Then I just send out a link to the .application file (file://server/share1/Support/Apps/MyWonderful.application). This works pretty well, and lets you specify what permissions you want your application to have.

"On one of my cards it said I had to find temperatures lower than -8. The numbers I uncovered were -6 and -7 so I thought I had won, and so did the woman in the shop. But when she scanned the card the machine said I hadn't.

"I phoned Camelot and they fobbed me off with some story that -6 is higher - not lower - than -8 but I'm not having it."
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How to make the toolbutton or toolmenu image backgroud to be the same with system background?

Seraph_summer30-Dec-07 23:20

Seraph_summer

30-Dec-07 23:20

I want to make the background of boolbutton images to be the same with system color.
How can I do? By the way, what does mean "ImageTransparentColor" property in VC#?
thanks.

Re: How to make the toolbutton or toolmenu image backgroud to be the same with system background?

Skippums31-Dec-07 7:47

Skippums

31-Dec-07 7:47

ImageTransparentColor is the color within the image that will NOT be drawn. So, for example, to make a bitmap where the only thing visible is a single black dot, make one with a single black dot over a magenta background. Then set the ImageTransparentColor property to magenta, and it will not be drawn. This is used so the images don't have to fill in a rectangular area when drawn. I beleive this answers both questions. (to make it system color, simply set the ITC property as described above, then set the container's backcolor property to the system color). Hope this helps,

Sounds like somebody's got a case of the Mondays

-Jeff

How to restrict file type in one or more dynamic file upload controls

Elena200630-Dec-07 23:14

Elena2006

30-Dec-07 23:14

Hi
How to restrict file type in one or more dynamic file upload controls in C# Web project.

For example I am creating code in code-behind

FileUpload uploadDataFile = new FileUpload();

In Browse dialog I want to restrict File Type as Xls, txt, CSv.

Please remember FileUpload controls are creating dynamically.

Thanks in Advance

Re: How to restrict file type in one or more dynamic file upload controls

N a v a n e e t h30-Dec-07 23:18

N a v a n e e t h

30-Dec-07 23:18

Elena2006 wrote:
In Browse dialog I want to restrict File Type as Xls, txt, CSv.

It's not possible with FileUpload control. You can check the file extension and content type after submitting the form.

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Re: How to restrict file type in one or more dynamic file upload controls

PIEBALDconsult31-Dec-07 15:41

PIEBALDconsult

31-Dec-07 15:41

What would be the point? A particular extension doesn't guarantee what the contents are.

Check to see if object is being referenced

Winkles30-Dec-07 22:34

Winkles

30-Dec-07 22:34

I have a tricky problem that I could really use some help on.

My app works with a number of very large float[] arrays that can easily use more memory than is available. To solve this I have created a memory manager that, in cases of dwindling memory, will dump some of the older arrays to temporary files. My app can request a reference to one of these arrays at any time, and the memory manager will recreate the array from the dumped copy if it's no longer in memory.

The problem is that my memory manager must not dump to disk any arrays that are currently being used by other parts of the app because a) any further changes to the array won't be reflected in the dumped copy, and b) dumping an array to disk that is being kept in memory by other parts of the application won't help memory load to begin with since the array won't be collected.

How can my memory manager, when it is deciding which arrays to dump to disk, check to see if other parts of the application are holding references to any of the arrays?

Thank you very much! Smile | :)

Re: Check to see if object is being referenced

CPallini30-Dec-07 22:43

CPallini

30-Dec-07 22:43

Why don't you use a cooperative approach, making your arrays released by their consumer to your memory manager?
Smile | :)

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Re: Check to see if object is being referenced

Stevo Z30-Dec-07 22:53

Stevo Z

30-Dec-07 22:53

exactly.

impelment same mechanism as COM object use.

add two methods:

AddReference()
ReleasReference()

and increase, decrease number of it's references in prive variable:
int referenceCount.

When AddReference() is called, referenceCount == 0 and array is dumped to file, recreate the array
When ReleasReference() is called and referenceCount == 1 , dump array to file.

Call AddReference() everytime you need to pass reference to another variable
Call ReleasReference() everytime you dispose this reference

zilo

Don't tell ME, I know that!

CPallini30-Dec-07 23:05

CPallini

30-Dec-07 23:05

(just kidding)
Big Grin | :-D

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.

[my articles]

Re: Don't tell ME, I know that!

Stevo Z31-Dec-07 1:49

Stevo Z

31-Dec-07 1:49

zilo

Re: Check to see if object is being referenced

Winkles31-Dec-07 8:42

Winkles

31-Dec-07 8:42

Thank you for the throughtful replies.

An issue is that the app reached a quarter million lines of code and a fair level of complexity before it became clear that temporarily writing these arrays to disk would be necessary. Being able to figure out a way to do this that is transparent to the rest of the app would be a real lifesaver.

Re: Check to see if object is being referenced

CPallini31-Dec-07 10:23

CPallini

31-Dec-07 10:23

I know it is hard to hear but maybe a bit refactoring is worth. please, don't blame me for Rose | [Rose]

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.

[my articles]

Re: Check to see if object is being referenced

Winkles31-Dec-07 10:45

Winkles

31-Dec-07 10:45

I don't blame you....but I still might be crying myself to sleep tonight. Big Grin | :-D

Re: Check to see if object is being referenced

CPallini31-Dec-07 11:31

CPallini

31-Dec-07 11:31

Well good night then and happy new year.
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.

[my articles]

Re: Check to see if object is being referenced

PIEBALDconsult31-Dec-07 15:53

PIEBALDconsult

31-Dec-07 15:53

My first thought upon reading the subject line was, "If it exists, it's being referenced".

Winkles wrote:
a quarter million lines of code

What's a line of code? Big Grin | :-D

Anyway, yeah, you need a class that does all that behind the scenes, sounds like a good weekend project.

Or make some type of database? So all the arrays are always cached to disk?

Protect authentification information

drweb8630-Dec-07 22:08

drweb86

30-Dec-07 22:08

Could you help me tisth advise how to protect user login and password

i have an open-source applcication which backups data and i want to prevent unauthirized access to file with options programmatically. There is a login and password of a backup user.

so i have no ideas what to use to prevent such information being disclosed or just copied with other people

Re: Protect authentification information

WillemM31-Dec-07 1:35

WillemM

31-Dec-07 1:35

You can protect sections of your app.config using DPAPI.
A sample of this can be found here: http://geekswithblogs.net/afeng/archive/2006/12/10/100821.aspx[^]

WM.

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DataGridView [modified]

Thaer Hamael30-Dec-07 20:16

Thaer Hamael

30-Dec-07 20:16

Hi all
I Wount to add Footer to DataGridView In C#.Net Windows Application
But In Windows Application The DataDridView Dont Have Footer To Add it
I wount to How i can add footer to DataGridView or A new Free Grid Control Have Footer
Thanks For Any Body Help Me Rose | [Rose]

Thaer

modified on Monday, December 31, 2007 2:34:56 AM

Re: DataGridView

Skippums31-Dec-07 7:52

Skippums

31-Dec-07 7:52

Create a new class, inherit from DataGridView, and override the OnPaint method to display your footer as follows

public override void OnPaint(...) {
    // Draw your footer at the bottom of the area defined by the rectangle passed to this method
    base.OnPaint(...); // Note that the rectangle passed to this method should be
                       // equal to the rectangle passed in MINUS your footer rectangle
                       // All other arguments should be identical to those passed in
}

Hope this helps,

Sounds like somebody's got a case of the Mondays

-Jeff

How can I do through MVC pattern

netJP12L30-Dec-07 19:58

netJP12L

30-Dec-07 19:58

How can I apply Model View Conrol (MVC) pattern on windows app, If i were to have only a custom user control class, Data class, and ProperGrid control on a Form1.cs in C#. I have went through couple of MVC patterns on google and here as well, but neither of them telling me how can we update raw data if they were to change by two places, first is through PropertyGrid itself and secondly when the custom control is moved through the mouse.

Please advise me if there is any link i can further learn from. Thanks I appreciate ur favor.

Re: How can I do through MVC pattern

N a v a n e e t h30-Dec-07 21:58

N a v a n e e t h

30-Dec-07 21:58

netJP12L wrote:
me how can we update raw data if they were to change by two places

I did this using delegates. So when the data class gets changed, delegate will be invoked and it will change the grid data. I don't know whether this is the real MVC pattern

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Re: How can I do through MVC pattern

netJP12L31-Dec-07 5:25

netJP12L

31-Dec-07 5:25

Thanks for answering, the way I am trying to implements is also the same way you said. I have a ShapeUserControl that get updated by the dataclass through the delegates. But my problem is how can I update the data class through the ShapeUsercontrol. Can you please show me some demo.

SharePoint & BizTAlk Server. Which one has better future?

Satish - Developer30-Dec-07 19:03

Satish - Developer

30-Dec-07 19:03

SharePoint & BizTAlk Server.

Among these two, Which one has better future.

For Employment, which course is better ?

Among these two, which one is easy to learn?

Can any one give your views regarding my question???

G. Satish

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