Keeping DataTable synchronized with DataGrid after row is deleted - C# Discussion Boards

How to accessing profile settings?

26-Sep-02 7:22

Or.....

Maybe that file you are opening needs reources from the network drive and that is taking so long....

Wink | ;)

Give them a chance! Do it for the kittens, dear God, the kittens!
As seen on MS File Transfer: Please enter an integer between 1 and 2.

CherezZaboro25-Sep-02 6:26

CherezZaboro

25-Sep-02 6:26

You know... application settings in ini/registry.
IOW I heed something like in MFC GetProfileString etc.

Re: How to accessing profile settings?

Mazdak25-Sep-02 6:53

Re: How to accessing profile settings?

25-Sep-02 6:53

I think RegistryKey class is what you want.

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

CherezZaboro25-Sep-02 7:02

CherezZaboro

25-Sep-02 7:02

Yeah but that's too complicated, compared to GetProfileString(MFC) or GetSetting(VB). I was lazy to dig into RegistryKey. Sleepy | :zzz:

Re: How to accessing profile settings?

Mazdak25-Sep-02 23:52

Keeping DataTable synchronized with DataGrid after row is deleted

25-Sep-02 23:52

inner wrote:
but that's too complicated, compared to GetProfileString(MFC) or GetSetting(VB).

Oh man,its really easier than MFC way I think. Poke tongue | ;-P

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

Doug Brower25-Sep-02 4:06

Doug Brower

25-Sep-02 4:06

I wonder if someone has solved this little problem:

Situation:
1) A data grid is bound to a dataset containing one datatable. There is no backend database connection, the datatable is populated programmatically.
2) At runtime, the user highlights a row in the grid and presses the delete key, intending to delete the row of data.

Now the problem, of course, is that the data isn't really gone. It's still in the datatable. But how do I update the table? A seemingly simple answer is to add a OnRowChangedEvent hander and call AcceptChanges()

protected void OnRowChanged(object sender, DataRowChangeEventArgs args)<br />
{<br />
	dataTable1.AcceptChanges();<br />
}

but this generates a stack overflow. Does anyone have an idea what I should really be doing?

Thanks!

Re: Keeping DataTable synchronized with DataGrid after row is deleted

leppie25-Sep-02 5:24

Re: Keeping DataTable synchronized with DataGrid after row is deleted

25-Sep-02 5:24

Doug Brower wrote:
At runtime, the user highlights a row in the grid and presses the delete key, intending to delete the row of data.

Now the problem, of course, is that the data isn't really gone. It's still in the datatable. But how do I update the table? A seemingly simple answer is to add a OnRowChangedEvent hander and call AcceptChanges()

protected void OnRowChanged(object sender, DataRowChangeEventArgs args)
{
dataTable1.AcceptChanges();
}

Hi

Override the OnRowDeleted function, and remember to call base.OnRowDeleted(sender, args) after calling your functions. Also have a look at DataTable.GetChanges(). Smile | :)

Hope this helps Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!

Doug Brower25-Sep-02 7:33

Doug Brower

25-Sep-02 7:33

Thanks for the suggestion, and quick response!!

Good books or reference for Multithread programming in C#

D Shen25-Sep-02 3:30

D Shen

25-Sep-02 3:30

Hi,

I am looking for a good book or reference about multithrad programming (Thread.Pool...) in C#. Your help is appreciated! Smile | :)

Re: Good books or reference for Multithread programming in C#

leppie25-Sep-02 5:49

Re: Good books or reference for Multithread programming in C#

25-Sep-02 5:49

Hi Have a look at the following.

http://www.gotdotnet.com/userfiles/toub/ManagedThreadPool.zip[^]

From the readme.txt:

Stephen Toub
stoub@microsoft.com

ManagedThreadPool.cs
August 27th, 2002
v1.0.1

Thread pool class written in C#. Mimics the core functionality of
the System.Threading.ThreadPool class. Useful when using System.Net
functionality in callback delegates.

I must say this guy has written some of the best code I have seen in C#. Although I havent looked at the above library, expect the code to be of high standard Smile | :)

Hope this helps Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!

D Shen25-Sep-02 9:04

D Shen

25-Sep-02 9:04

Thank you, Leppie. Laugh | :laugh:

Connection Strings To Db.

Nick Parker25-Sep-02 2:42

Nick Parker

25-Sep-02 2:42

What is the best way to specify the application path in C#? In VB we could use App.Path. I am trying to specify the following connection string and it is drawing a line underneath it so I know it doesn't like the way I have declared it.

string myConnString = "Provider=SQLOLEDB;Data Source="C:\Documents and Settings\User\Desktop\phonebook\phonebook.mdb";" +
					                  "Initial Catalog=phonebook;Integrated Security=SSPI;" + 
									  "Connect Timeout=30";

I have also tried

string myConnString = "Provider=SQLOLEDB;Data Source=@"C:\Documents and Settings\User\Desktop\phonebook\phonebook.mdb";" +
					                  "Initial Catalog=phonebook;Integrated Security=SSPI;" + 
									  "Connect Timeout=30";

Nick Parker

The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown

Re: Connection Strings To Db.

leppie25-Sep-02 5:11

Re: Connection Strings To Db.

25-Sep-02 5:11

Hi Nick, note the escapes, else the string will end Smile | :)

You can AFIAK substitute "\" for "/" in paths. I ussually find it easier to drop a DBConnection on the form, then setup connection string via wizard. Then just copy and paste it to a const string.

string myConnString = "Provider=SQLOLEDB;Data Source=\"C:/Documents and Settings/User/Desktop/phonebook/phonebook.mdb\";" + 
"Initial Catalog=phonebook;Integrated Security=SSPI;" + 
"Connect Timeout=30";

Hope this helps Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!

Nick Parker25-Sep-02 17:54

Nick Parker

25-Sep-02 17:54

Thanks leppie,
I actually ended up using the quoted string literal (i.e. - @) so it was a little cleaner, however I had the snytax a little messed up this morning. It now looks like this:

string myConnString = "Provider=Microsoft.Jet.OLEDB.4.0;" + 
	             "Data Source=" + @"C:\Documents and Settings\User\Desktop\phonebook\phonebook.mdb";

Thanks

Nick Parker

The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown

TAPI3 Telephony

Harihara Subramanian25-Sep-02 2:35

Harihara Subramanian

25-Sep-02 2:35

I would like to know how i can play a wave file through TAPI. My requirement is to hook up to a telephone number through a Modem and when the connection is successful, the application should play a wave file.

There is no adequate support provided in .NET frame work for Telephonic applications.

Can some one help please.....

Harihara Subramanian

Re: TAPI3 Telephony

Ray Cassick25-Sep-02 3:47

Ray Cassick

25-Sep-02 3:47

Take a look here:

http://www.gotdotnet.com/userarea/keywordsrch.aspx?keyword=Tapi[^]

TAPI3 Telephony with Playback

Harihara Subramanian25-Sep-02 20:31

Harihara Subramanian

25-Sep-02 20:31

This example is an excellent one, however how do i play a *.wav file after the connection is hooked up, also is there any event that specifies that the receiver has picked the phone up. OMG | :OMG:

Harihara Subramanian

Re: TAPI3 Telephony with Playback

Ray Cassick26-Sep-02 3:53

Ray Cassick

26-Sep-02 3:53

Harihara Subramanian wrote:
also is there any event that specifies that the receiver has picked the phone up.

It sounds to me like you have not done a lot of Tapi programming before Smile | :)

Don't worry.. we all had to start someplace... Modems are notoriously (sp) bad for detecting remote connection (and in some cases remote disconnection as well).

Take a look at the following URL for some (a bunch) of answers to common Tapi related issues. Even though this stuff is written for Tapi 2.1, it should fo rthe most part apply for V3+ as well. Not much has changed in the world of Tapi support for modems...

http://home.attbi.com/~bpennypacker/tapifaq/[^]

http://home.paralynx.com/~mike_dunn/faq.htm[^]

Bottom line is that if yuo want to get decent performance from Tapi for an IVR or a voice mail or something like that then you should use a Telephony card like from Inetl/Dialogic or something like that. They were made to work as a voice device where Modems were made to be mainly data devices.

Tree View

Mazdak24-Sep-02 23:34

24-Sep-02 23:34

I have tree view control.I overriden AfterSelect event.I want to get index of primary nodes,not sub nodes selected.I mean when I select oe of sub nodes I found out the index of its parent.

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

leppie25-Sep-02 5:36

25-Sep-02 5:36

Mazdak wrote:
I overriden AfterSelect event

Dont do that! Do this Smile | :)

protected override void OnAfterSelect(TreeViewEventArgs e)
{
  //do your functions here
  base.OnAfterSelect(e);
}

This is the correct way of overriding event behaviour.

Now when you recieve the event it should work Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!

Mazdak25-Sep-02 6:51

25-Sep-02 6:51

Sorry,I can't understand! Could you tell how to define this function?

Thanks

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

leppie25-Sep-02 7:35

25-Sep-02 7:35

Just read MSDN, it explains it all. Smile | :)

Specifically TreeView.OnAfterSelect Method[^]

Sorry, no web link Frown | :(

Give them a chance! Do it for the kittens, dear God, the kittens!