C# Discussion Boards - CodeProject

Re: Remoting - re-establishing the connection

Tom Larsen20-Jul-05 9:33

20-Jul-05 9:33

Networks by their very nature can be disconnected. It is just like file permissions, memory allocation, and other limited resources. Any networked system should be designed in such a way that it will deal if one side can not contact the other.

Another thing to keep in mind is that with .Net Remoting, objects are kept alive by leases so it is not dependent on the client side to constantly make "pings". You may want to twiddle the settings found in the LifetimeServices class, especially the RenewOnCallTime. It may very well be the reason why the system is failing is because the server got rid of its representation of the object because it has exceed its lifetime. This should be an obvious exception though and only applicable to client activated objects.

custom events

rathishps20-Jul-05 4:02

rathishps

20-Jul-05 4:02

Hi friends,
I have a doubt about a new feature, custom events in VB.NET. Do anybody know the exact equivalent in c#. If someone, please help me.

Regards,
Rathish P S

Re: custom events

Judah Gabriel Himango20-Jul-05 4:22

Judah Gabriel Himango

20-Jul-05 4:22

Yes. Create a delegate defining how your function will look like (or alternatively, use an existing delegate like System.EventHandler):

public delegate void MyDelegate(int number, string text);

Then define an event in your class:

public event MyDelegate MyEvent;

And to raise the event in your class:

if(MyEvent != null)
{
    MyEvent(5, "hello!");
}

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

Handling single pixels

Yoyosh20-Jul-05 3:54

Yoyosh

20-Jul-05 3:54

What is the best way (class?) to operate on single pixels (refering to them by for example absolute position in x,y coordinates), which will allow to set their colors in hex or maybe even move them?

thanks for help in advance

Martinez

Re: Handling single pixels

Judah Gabriel Himango20-Jul-05 4:25

Judah Gabriel Himango

20-Jul-05 4:25

You can get and set pixels of a bitmap using Bitmap.GetPixel(x, y) and Bitmap.SetPixel(x, y, Color). Unfortunately, the GetPixel & SetPixel methods are extremely slow, you might want to use the Fast Bitmap[^] class which gives fast access to pixels by using pointers and unsafe code.

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

Accessing Remote Server File

domyansumit20-Jul-05 3:52

domyansumit

20-Jul-05 3:52

Hi All

I want to access a file from remote machine on my LAN. When i execute \\MyServer\C$ in my RUN Window, It asks for the username & password of remote machine. After that i can access the file through my .NET code. But after logging of from my machine and then again logging in, that code does not work.
Can anyone please tell me how can i pass user credentials through my .NET code to access remote machine file.

Thanks to all,
Sumit

frame probrem in AxWebBrowser

Anonymous20-Jul-05 1:18

Anonymous

20-Jul-05 1:18

How to control html page containing frame object by AxWebBrowser?
I wrote the code as following.

-----
HTMLDocument doc = (HTMLDocument)this.WebBrowser.Document;
object index = 1;
IHTMLWindow2 window = (IHTMLWindow2)doc.frames.item(ref index);
doc = (HTMLDocument)window.document;
-----

The error message was like this (I'm sorry for Japanese):

-----
'System.InvalidCastException' のハンドルされていない例外が mscorlib.dll で発生しました。

追加情報: インターフェイスがサポートされていません
-----

I tried translate above message.

-----
non-handled exception 'System.InvalidCastException' was occurred in mscorlib.dll.

additional information: interface is not supported
-----

the same problem occurred when I tried this code

-----
HTMLDocument doc = (HTMLDocument);
MessageBox.Show(doc.frames.length.ToString());
-----

So, what is the problem?
Please help me ...

Re: frame probrem in AxWebBrowser

Judah Gabriel Himango20-Jul-05 4:27

Judah Gabriel Himango

20-Jul-05 4:27

Perhaps doc.frames.item(ref index) isn't returning an IHTMLWindow2 interface? I'd check that in the debugger, see the actual type that is being returned before assuming it is an IHTMLWindow2.

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

Re: frame probrem in AxWebBrowser

Anonymous20-Jul-05 4:58

Anonymous

20-Jul-05 4:58

No, that misses the mark.
Because this error occurs even if the code doesn't use the cast.

Re: frame probrem in AxWebBrowser

Judah Gabriel Himango20-Jul-05 5:18

Judah Gabriel Himango

20-Jul-05 5:18

What happens if you go

object o = doc.frames.item(ref index);

?

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

Re: frame probrem in AxWebBrowser

Anonymous20-Jul-05 5:37

Anonymous

20-Jul-05 5:37

Error that I wrote in the first message occurs.
I.e, the situation is same when go

IHTMLWindow2 window = (IHTMLWindow2)doc.frames.item(ref index);

access remote ftp folder using shell extension

Asif Rehman20-Jul-05 1:08

Asif Rehman

20-Jul-05 1:08

Here's what I want.

1. I have remote ftp server(with ip, user, pwd).

I want to make virtual ftp folder using shell extension which directs me to ftp server after asking about the user, pwd.

Can anyone tell me about the detailed descriptive article on this issue.

Any hint will also be welcome.

Crystal Report(Urgent)

alok_2k320-Jul-05 1:07

alok_2k3

20-Jul-05 1:07

Hi
how can I prepare a crystal report in .net using C# & sqlserver.

Thanks in Advance
Alok

Alok

Re: Crystal Report(Urgent)

V.20-Jul-05 3:28

20-Jul-05 3:28

can you be more specific?

What would you like to do?

No hurries, no worries.

Re: Crystal Report(Urgent)

harbanone27-Jul-05 16:59

harbanone

27-Jul-05 16:59

Crystal reports for .net has its own wizard where you can build the report, you have to link the project to view it, search for the examples in the code project

Carlos Sánchez Pérez
Mathesis Consultores
Cd. Obregon Sonora
carlos@mathesis.com.mx

DataGridView Control

rrema20-Jul-05 0:30

rrema

20-Jul-05 0:30

Hi all

Can anyone help me.

I do have Table Employee in SQL Server 2000

Fields in Employee Table - Empno,Ename,Esal

I want to display these details in DataGridView.

and my column headings in DataGridView like Employee No, Name,Salary.

How to bind values to DATAGRIDVIEW using DATASET.

Thanks in advance

with thanks
Rema

Re: DataGridView Control

Asif Rehman20-Jul-05 1:03

Asif Rehman

20-Jul-05 1:03

just search with the keyword DataGridView in codeproject or google.

hope you'll find dozens of articles.

How to do this??

amrutajoshi20-Jul-05 0:10

amrutajoshi

20-Jul-05 0:10

Hello All,
I have simple client application and i have to refresh this client side form only when some event occurs.I have to store this event in database and check in database to see if any event occured and if any event ocuured then the client side is to be refreshed.
I dont know how to do this?

Thanks
Amruta

Re: How to do this??

Alomgir Miah20-Jul-05 3:29

Alomgir Miah

20-Jul-05 3:29

Is this a high transactional database. What is the rate of such events. I had encountered similar scenario and I did the following

(1) If any event occur in the database, write the data to a Database Table inside a trigger( specifically for this).
(2) A windows service in Client keeps polling this table after say every 30 sec.
(3) If records are found do the refresh.

Hope this helps.

Thanks,
Alomgir Miah
Live Life King Size

c# SMS project

Member 183508320-Jul-05 0:02

Member 1835083

20-Jul-05 0:02

hi.. i am planning to build an application that involves sms. the concept is mobile phone1 sends a messsage that contains keywords (example BALANCE) to another mobilephone2 that is connected to a computer. Once received, it accesses the computer's database. The information is retrieved and then is sent to the mobile phoneA.
The problem is i don't know where to start. can u guys give me a clue? i also need resources of existing application for my documentations.. please help.. tnx

Help me!

hoale19-Jul-05 23:32

hoale

19-Jul-05 23:32

Hi all!
I write a C# class and compile to DLL file, then I register it thus DCOM. How can I use it in C# remote application?
Thanks!

Help me!

hoale19-Jul-05 23:30

hoale

19-Jul-05 23:30

Hi all!
I write a C# class and compile to DLL file, then I register it thus DCOM. How can I use it in C# application?
Thanks!

Re: Help me!

DavidNohejl20-Jul-05 3:40

DavidNohejl

20-Jul-05 3:40

Well if it is C# class then you can reference your dll in another C# project... COM registration is unnecessary in this case.
Just right click on References in Project EXplorer (assuming you use Visual Studio) and add your dll... you can then simply use all public classes in that dll.

David

Re: Help me!

hoale20-Jul-05 22:39

hoale

20-Jul-05 22:39

Thanks! But i want to call some methods of class on another machine!
System.Type type = Type.GetTypeFromProgID("ProgID","ServerAddress");
object obj = System.Activator.CreateInstance(type);
How do I use obj to call some method of it!
Thanks for your help!

hoale

textbox validation

dhol19-Jul-05 23:14

dhol

19-Jul-05 23:14

Hi
I am completely new to c# .so i am just into basics.
just now i am beginning to work with windows forms

now i have to add a text box and a insert button
now when iam entering the text it should be inserted when the button is clicked.
now wht i need is that when the text box is empty and when i clicked the button , it should show a message saying that textbox is empty

I Think this is very smalll problem. But as iam new, pls guide me to do it .

j o h n

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