Re: How to put data from an IList to a Dataset - C# Discussion Boards

Does File.Copy() prevent other file commands?

Sensei765-Jan-06 1:24

5-Jan-06 1:24

Hello, I wonder where this often appearing error comes from. I'd guess nearly every programmer knows the "...is being used by another process" problem.

My situation:
In my application I need to perform a couple of tasks on a single file like:
- writing some bytes into it
- copy it (I cannot use File.Move() at his point)
- and shortly after that: rename the copy with File.Move()

When executing next command after File.Copy() that also accesses the file (no matter if that is Move(), another Copy() command, or whatever) I get the classic exception with the errormessage "Cannot access file XYZ because it is being used by another process."

If I simply catch the exception - and do nothing within the catch block - the file operations all work SUCCESSFULLY.

So my question is, what is going on there?
Is it a possibly explanation that the execution of the application already continues although File.Copy() has not finished, and so the next file operation command accesses too early?

Is there a more elegant way to solve this other than an empty try...catch block?
I am sure there is... but what?

I'm curious about your opinions.

Re: Does File.Copy() prevent other file commands?

S. Senthil Kumar5-Jan-06 3:19

S. Senthil Kumar

5-Jan-06 3:19

Are you closing the file handle after writing bytes to the file? You'll get the exception you mentioned if you don't.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Does File.Copy() prevent other file commands?

mav.northwind5-Jan-06 3:19

mav.northwind

5-Jan-06 3:19

Hi!
Are you sure the File.Copy() is the reason? If you're "writing some bytes into it" I think it's more likely that you didn't close your File or FileStream properly.

Some code would definitively help.

Regards,
mav

Re: Does File.Copy() prevent other file commands?

Sensei765-Jan-06 5:30

Sensei76

5-Jan-06 5:30

Yes the stream is closed, I just checked that again.

I'll post some code tomorrow when I get back to work.

How to put data from an IList to a Dataset

LongNguyen5-Jan-06 0:34

LongNguyen

5-Jan-06 0:34

Pls tell me how to put data from an IList to a Dataset.
Regards.

Re: How to put data from an IList to a Dataset

VenkataRamana.Gali5-Jan-06 0:45

VenkataRamana.Gali

5-Jan-06 0:45

you are using
.NET 1.1 or 2.0?

regards
GV Ramana

Re: How to put data from an IList to a Dataset

LongNguyen5-Jan-06 0:49

LongNguyen

5-Jan-06 0:49

I'm using .net 1.1. Pls tell me how to put data from an IList to a Dataset, in both .net 1.1 and .net 2.0. Thanks.

-- modified at 6:49 Thursday 5th January, 2006

Re: How to put data from an IList to a Dataset

VenkataRamana.Gali5-Jan-06 0:57

VenkataRamana.Gali

5-Jan-06 0:57

Hi undead,

Your question is not proper.

However Where IList Interface is Implemented weather explicitly u r implementing? if yes, If Add method is implemented in your class, take for each loop and with IList.IndexOf(i)store in a DataSet.

Still you not get my answer, give detail question & requirement.

bye

regards
GV Ramana

Re: How to put data from an IList to a Dataset

LongNguyen5-Jan-06 14:57

LongNguyen

5-Jan-06 14:57

Thanks with your help. I'm sorry that I didn't give u detail question & requirement.
I used Oject.Net to get data from a database to an IList (function PersistenceManager.getAllObjectsFromDb(typeof(Student));)

public class Student
{
int m_StudentId;
string m_Name;
string m_Email;
....
}

When I run, it will return an IList containing an array of Student object. After that I bind this IList to a datagrid, it's OK, but I don't know how to sort data in this IList (ex : m_Name DESC) so that I want to change it to a datatable (or dataset) to use the dataview to sort data.
How to do that???

Problem after creating an installer for my project

ger_creal4-Jan-06 23:57

ger_creal

4-Jan-06 23:57

Hi there!

After build my project it runs on my computer without problems. After installing that on my laptop it doesnt work.
The application uses 2 dlls coded in c++. when the application starts, it cant access the dlls.

http://msdn2.microsoft.com/en-us/library/ms235317.aspx --> desribes a workaround

I have to set a PATH environment variable in System-Advanced-Environment Variable under Windows XP.
But I have no idea how to make it with an *.bat file.

Is it possible to place the path variable in the registry?

Cry | :((

Re: Problem after creating an installer for my project

Curtis Schlak.5-Jan-06 8:23

Curtis Schlak.

5-Jan-06 8:23

In your installation project, open the Registry view and add your custom values as children to the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" key.

NOTE: As always, you assume risk when changing the registry. Doing so can cause your system to become unstable or unusable. Please, do so at you own risk.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Create a new Event in C# Webform!

LordBalu4-Jan-06 23:30

LordBalu

4-Jan-06 23:30

I have a problem,

i build an aspx page a normal webform, on this i use a control from somewhere deep in the internet, it looks like a textbox, but has a small calendar attached, doesnt matter, works fine. The Problem is, that textbox has no 'TextChanged' Event, but i really need this one.
So my question is, could anybody help me, how to add this event to this custom TextBox, means how to add an event which is fired when the text in this box is changed!
Or in general how to create new events for existing controls/classes or whatever, damn .NET!

Hope someone is genius on that and can help me out soon,

looking forward not to kill myself Smile | :)

regards

Balu

Confused | :confused:

Re: Create a new Event in C# Webform!

VenkataRamana.Gali5-Jan-06 0:20

VenkataRamana.Gali

5-Jan-06 0:20

Hello Balu

plz refer this link

http://www.dotnetjunkies.com/Article/D481E737-BA40-472E-BEBD-E193FC68F8F2.dcik[^]

or
you can handle your problem with javascript also. i.e like this
suppose your control name is ctrl1.

go to page load event
ctrl1.Attributes.Add("onchange","someJSfunction1()");
now go to HTML view there define the someJSfunction1().
Smile | :)

regards
GV Ramana

Re: Create a new Event in C# Webform!

LordBalu5-Jan-06 0:51

LordBalu

5-Jan-06 0:51

Thanks for the fast reply,

i cant do this in Javascript cause i have to interact with another vb script editor and i cant use scripts on the html side, i need to pass my data from the code behind page, i have to use the event mentioned in the first post, to make an Sql call and then transfering recieved data to a vb script on whether the html side or in this special vb script editor!
I will see if the articel you posted could help me out!
If there are any other articles, how-to´s what ever on this topic, please post it!

Thanks again,

regards

Balu

Sniff | :^)

Using radio button / check boxes in touch screen

madhusri4-Jan-06 23:19

madhusri

4-Jan-06 23:19

how to create/extend the some of the standard controls like radio buttons / check boxes to make them more touch screen friendly.
It would be helpful if you can provide the options as early as possible

Thanks
Madhu Srinivasan

Re: Using radio button / check boxes in touch screen

Curtis Schlak.5-Jan-06 8:26

Curtis Schlak.

5-Jan-06 8:26

Do you just want larger targets for the touch screen? If so, just change their Height and Width properties to affect that. Ensure that the larger controls do not overlap.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Is there any facility in VS 2005 to do unit testing

engsrini4-Jan-06 22:36

engsrini

4-Jan-06 22:36

Hi

Is there any tool in VS 2005 to do unit testing, creating test report.

Thanks and Regards
Srini

srini

Re: Is there any facility in VS 2005 to do unit testing

Vikram A Punathambekar5-Jan-06 0:17

Vikram A Punathambekar

5-Jan-06 0:17

I'm running beta 2, and there is a testing framework(?) built into it. Check out the (would you have guessed it?) Test menu.

Cheers,
Vikram.

"When I read in books about a "base class", I figured this was the class that was at the bottom of the inheritence tree. It's the "base", right? Like the base of a pyramid." - Marc Clifton.

Re: Is there any facility in VS 2005 to do unit testing

S. Senthil Kumar5-Jan-06 3:20

S. Senthil Kumar

5-Jan-06 3:20

You can use NUnit[^] in conjunction with TestDriven .NET[^] as an alternative to the builtin unit testing feature.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Datagridview in Crystal Report - Please help me A.S.A.P.

Tyler454-Jan-06 21:51

Tyler45

4-Jan-06 21:51

how can i see datagrid results in crystal report, or how can i connect datagrid that is belongig to a from with a crystal report. i designed datagrid as follows

SqlConnection conn;
string myquerry;
SqlCommand command;
DataSet veri_sert = new DataSet();
SqlDataAdapter adaptor = new SqlDataAdapter();

command = new SqlCommand(myquerry, conn);
adaptor.SelectCommand = command;
adaptor.Fill(veri_sert, "cash_register");
dataGridView1.DataSource = veri_sert;
dataGridView1.DataMember = "cash_register";

Need code, please

mehrdadc484-Jan-06 21:24

mehrdadc48

4-Jan-06 21:24

Hi.
I need a sample code that using it I can first delete all records in database (make database empty), then insert one row in it.
my database is Access, and languge C#.
Please help me in this context with complete code.
Thank's very much.

Best wishes

Re: Need code, please

J4amieC4-Jan-06 21:32

J4amieC

4-Jan-06 21:32

Well, at least you said please!

1) You give no details of the database tables, the table you want to insert into or any evidence that you have tried this yourself.
2) You EXPECT complete code? You will find a number of people here charge a good daily rate for coding, others are hobbyists who also give alot of time to a community such as CP. However, almost everyone is prepared to answer questions if the person shows SOME initiative (even a little). In your case there was ZERO!
3) Read How to get answers to your questions[^]

And if you were ever in any doubt - Notice a pattern in this posters questions?[^]

-- modified at 12:06 Thursday 5th January, 2006

OT: That's Great!

Curtis Schlak.5-Jan-06 8:05

Curtis Schlak.

5-Jan-06 8:05

I like your statement "And if were ever in any doubt...." The link really made me laugh.

You have my 5.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Need code, please

daniel_nilsson4-Jan-06 21:48

daniel_nilsson

4-Jan-06 21:48

private void deleteIt()
{
 System.Data.OleDb.OleDbConnection oleCon = new System.Data.OleDb.OleDbConnection();
			oleCon.ConnectionString("connectionstring");
			oleCon.Open();
			System.Data.OleDb.OleDbCommand oleCom = new System.Data.OleDb.OleDbCommand("delete from table", oleCon);
			oleCom.ExecuteNonQuery();
			oleCon.Close();
}

private void add()
{
System.Data.OleDb.OleDbConnection oleCon = new System.Data.OleDb.OleDbConnection();
			oleCon.ConnectionString("connectionstring");
			oleCon.Open();
			System.Data.OleDb.OleDbCommand oleCom = new System.Data.OleDb.OleDbCommand("insert into table (value1, value2) Values("values1", "values2"), oleCon);
			oleCom.ExecuteNonQuery();
			oleCon.Close();

}

i dont know if this wil help you but its a try...

Major Headache with installation

TofuBug244-Jan-06 20:43

TofuBug24

4-Jan-06 20:43

I've got an interesting Error on a recent program i've written that i am hoping someone could shed some light on.

My program at the moment consists of a main form and 2 word document programs written using vsto the entire things was written and tested in vs team system 2005 now i've written a set up program that essentially installs all the files and then registers the directory the word documents and their dll files are in with caspol.exe now on my computer it works just fine when i test the installation.

however i used my girlfriends computer as another test platform the install went fine she didn't have the .net 2.0 framework so the bootstrap loaded fine and it installed the framework it then proceded to install the app that all ran smooth and quick so i run the program and everything is working as it should.

but as soon as i try to open either of the word documents word gives the following error:

"The assembly * could not be found at or could not be loaded."

and yes that's the whole error message i have no clue where to even start....

if anyone has any ideas please let me know

thanks so much

Ryan

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