C# Discussion Boards - CodeProject

Programm3r23-Apr-08 20:51

23-Apr-08 20:51

Hi all,

I am using the software upgrade process within Visual Studio to perform the software upgrade. The problem is that everytime I perform an upgrade, the existing configuration file gets wiped. What must I do to prevent this?

Many thanks in advance
Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
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Graphic Problem

Reza Shojaee23-Apr-08 20:30

Reza Shojaee

23-Apr-08 20:30

Hi My Friends,

I write a program with C#, that after clicking button OpenFileDialog appear and you can select a text file and then my program read the text file and insert into Database.
This program work good and no problem but after click select and open text file in the OpenFileDialog about 2 or 3 second (depend to the size of file)
below picture appear :
http://www.freewebs.com/autoclinic/images/untitled.gif[^]

I want to know how can prevent this action ?

Best Regards,
Reza Shojaee

Re: Graphic Problem

Giorgi Dalakishvili23-Apr-08 20:56

Giorgi Dalakishvili

23-Apr-08 20:56

Your program's UI freezes because it is busy reading txt file and inserting it into database so it has no time to repaint itself. Try moving the file processing code into a new thread.

Giorgi Dalakishvili

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Re: Graphic Problem

Reza Shojaee23-Apr-08 21:06

Reza Shojaee

23-Apr-08 21:06

Thanks for your guidance,
If I don't want use multithread programming.Can repaint form manually before insert data into database?

Best Regards,
Reza Shojaee

Re: Graphic Problem

Giorgi Dalakishvili23-Apr-08 21:08

Giorgi Dalakishvili

23-Apr-08 21:08

Try Application.DoEvents() method

Giorgi Dalakishvili

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Re: Graphic Problem

Reza Shojaee23-Apr-08 21:16

Reza Shojaee

23-Apr-08 21:16

Special thanks for you.
my problem solved.

Best Regards,
Reza Shojaee

WaitOne with 0 as timeout value

George_George23-Apr-08 20:23

George_George

23-Apr-08 20:23

Hello everyone,

1.

I have checked MSDN document,

http://msdn2.microsoft.com/en-us/library/kzy257t0(VS.80).aspx

it does not cover what is the function of WaitOne if we assign 0 as the timeout parameter.

I think the function of assigning 0 is to check whether the signal is set or not, and it will be returned immediately, right?

2.

If WaitOne (0, true) returns true, it means the signal is set or not set?

thanks in advance,
George

problem with DataBase Path While uploading Images

avvaru.murali23-Apr-08 20:14

avvaru.murali

23-Apr-08 20:14

Hi iam in windows application using c#.
my database is "FireBird Database".

Database path is :

string dsRelativePath = "database\\absolutemedia.fdb";
string dsAbsolutePath = Path.GetFullPath(dsRelativePath);
string ConnectionString = "ServerType=1;User=SYSDBA;Password=masterkey;Database=" +dsAbsolutePath;

This path is working fine upto now..
but in my application, i have an option to upload images from local drives..iam browisng an image thru "OpenFileDialog".. after selecting an image .when iam going to save ,
database path i,e dsAbsolutePath is changed to image path.it's giving error in database connection...
please reply where the problem is ?
how can i rectify this .

murali krishna

Re: problem with DataBase Path While uploading Images

Spunky Coder23-Apr-08 20:30

Spunky Coder

23-Apr-08 20:30

I think u are setting the image path in dsRelativePath after the image is selected...check that ...if so store the path in different variable

.....

Re: problem with DataBase Path While uploading Images

avvaru.murali23-Apr-08 20:36

avvaru.murali

23-Apr-08 20:36

Hi,
Thanks for Reply..
Here iam not setting ImagePath to "dsAbsolutePath";
iam taking Imagepath to another string.

murali krishna

Re: problem with DataBase Path While uploading Images

Spunky Coder23-Apr-08 21:04

Spunky Coder

23-Apr-08 21:04

i don't understand how come image path value is taken in dsAbsolutePath without setting it ...declare the dsAbsolutePath and dsRelativePath variables as constants and see if the error still occurs..can u post your code ?

.....

BandWidth Programming in C#

Balaji.KJ23-Apr-08 19:34

Balaji.KJ

23-Apr-08 19:34

Dear all,

Can anyone help me to do bandwidth programming in C# 2003? If anyone aware of this kindly, forward me source code of sample project and also your mail id. So, I could contact you later as if I've doubt on that

Re: BandWidth Programming in C#

MumbleB23-Apr-08 20:16

MumbleB

23-Apr-08 20:16

Have you tried searching Google? There are a few articles here on CodeProject as well. Guys here don't like giving code without you doing your bit and showing what you have done. Treat Google as your friend.

Excellence is doing ordinary things extraordinarily well.

Close an HTTPListenerResponse.OutputStreram

George_George23-Apr-08 19:02

George_George

23-Apr-08 19:02

Hello everyone,

1.

When we close the HTTPListenerResponse.OutputStreram (using Close method, when complete writing content from server side), I think in the internal of CLR, there should be some flush work during Close method (I do not think each time when we write to the stream, data will be flushed immediately).

But the return type of Close is void and there is no exception thrown from Close from MSDN document for Close method, if Close fail, and means data is corrupted -- flush of data failed. How could we detect this situation?

2.

Any best practices to solve the issue when program server side code?

thanks in advance,
George

need help retrieving an autonumber from an MS Access table using C#

precado99923-Apr-08 15:12

precado999

23-Apr-08 15:12

I am working on my senior project and I am using C#.net and Microsoft Access to create a program that lets the user store information into a database. I have many tables but the primary table that mostly everything connects to is the customers table. Well I know how to insert, update and delete using C#. But I need to know how to retrieve the primary key from the customers table which happens to be an autonumber. I kind of understand that I need to use SCOPE_IDENTITY or @@IDENTITY. I just have no idea how. I have tried a couple ways without any success. The reason I need the primary key of this table is that I need it to be able to insert more data into other tables. Confused | :confused:

Re: need help retrieving an autonumber from an MS Access table using C#

I.explore.code23-Apr-08 18:47

I.explore.code

23-Apr-08 18:47

Is it necessary for you to have an autonumber field as a key in your table ? if not, u can write ur own code for auto-incrementing the id and for this, u can modify ur database and change the key field to a normal id. As far as i think auto-number fields are generated automatically when u insert the record, but u certainly can retrieve the id for viewing purpose.

Re: need help retrieving an autonumber from an MS Access table using C#

precado99924-Apr-08 10:59

precado999

24-Apr-08 10:59

thanks

Does Platform invoke importing the GDI32.dll is supported by different OS Versions?

Faysal23-Apr-08 14:54

Faysal

23-Apr-08 14:54

Hi,

I am using streatchblt() and SetStretchBltMode() functions of unmanaged code in C# for printing image. For doing that I am calling the external gdi32.dll (form windows folder) file.

I am new in doing this sort of platform invoke operation. Plz tell me if my software is run in any windows version ranges form windows 95 to vista or any upcoming version, will this be problematic?

[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]<br />
<br />
static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest, int nYOriginDest,int nWidthDest, int nHeightDest, IntPtr hdcSrc, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc, Int32 dwRop);<br />
<br />
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]<br />
<br />
static extern bool SetStretchBltMode(IntPtr hdc, int iStretchMode);

>> I have tried to add this dll file as a reference in my code but failed to do so as this file is unaccessible.

Plz tell me if I have any alternative for doing the work of the above mensioned functions with managed code.

thanks in advance Smile | :)

Faysal

Re: Does Platform invoke importing the GDI32.dll is supported by different OS Versions?

Christian Graus23-Apr-08 16:44

Christian Graus

23-Apr-08 16:44

No, StretchBlt has been there forever. Goodness knows why you're using it tho. You can set the draw mode of GDI+ stretch drawing in C#.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Does Platform invoke importing the GDI32.dll is supported by different OS Versions?

Faysal23-Apr-08 22:21

Faysal

23-Apr-08 22:21

As far as I know there is no function like stretchblt() or SetStretchBltMode() in C#. And if I try to change the resolution of my image according to my printer's device context then it gets too slow without showing any apperant change in the print quality.

Plz tell me if you know about any such function in C# or any other way to obtain a better print out quality of image in C#. (I really want to avoid unmanaged code in C#)

Faysal

Re: Does Platform invoke importing the GDI32.dll is supported by different OS Versions?

Christian Graus24-Apr-08 12:21

Christian Graus

24-Apr-08 12:21

The Graphics object has DrawImage, most of hte overloads let you resize the image.

There are overloads that take an ImageAttributes object, you either set the stretch mode there, or there's a property on the Graphics object to set the stretch mode.

Wrap around Single Dimension array

Blade24323-Apr-08 14:46

Blade243

23-Apr-08 14:46

Hi im trying to remove an element from a single dimension array and i heard the only way to do this is sort of a wrap around, but im not to sure on how to approach this. I know its easy using Array Lists but i cant use that for what i am trying to do, any help would be appreciated

Re: Wrap around Single Dimension array

Anthony Mushrow23-Apr-08 15:47