Visual Basic

Bharat Jain12-Jan-09 0:45

Bharat Jain

12-Jan-09 0:45

Hi Rajesh ,
Most of the installer allow you to edit the registry , but if you want to write registry value from a application you can use the following code , in the following code i have used the 'Microsoft.Win32' , which makes our job of writing or registry value easy , the you can add the following code on load event of your main form , the code will try to read a value if not present it will create a key , also if some one goes and change the value , the application will not start net time , saying "This Application is not installed properly" , i hope this solves your problem , the entry is created under

HKEY_LOCAL_MACHINE\SOFTWARE\

Dim regKey As Microsoft.Win32.RegistryKey
Dim ver As String

regKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("Software\MyApp", True)
If regKey Is Nothing Then
    regKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE", True)
    regKey.CreateSubKey("MyApp")
    regKey.Close()
    regKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("Software\MyApp", True)
    ver = regKey.GetValue("InstallKey", "")
    If ver <> "TestInstallKey" Then
        regKey.SetValue("InstallKey", "TestInstallKey")
    End If
    regKey.Close()
Else
    ver = regKey.GetValue("InstallKey", "")
    If ver <> "TestInstallKey" Then
        regKey.SetValue("InstallKey", "TestInstallKey")
        MsgBox("This Application is not installed properly")
        End
    End If
    regKey.Close()

End If

Just let me know , if this solves your problem ....
Have a nice day Smile | :)

-Regards
Bharat Jain
bharat.jain.nagpur@gmail.com

rajesh_ncc12-Jan-09 2:36

rajesh_ncc

12-Jan-09 2:36

Hi Bharat Jain

I would like to say thanks for your replay. i had seen your code it's ok but i need to create the register value in regedit when we run the setup or end of the installation. is this possible.

Regards

K. Rajesh Kumar

i am a fresher in software development i have so many doubts in .net so i need to ca

Bharat Jain12-Jan-09 4:18

Bharat Jain

12-Jan-09 4:18

Ya it is possible , which program are you using to create your installer ?

-Regards
Bharat Jain
bharat.jain.nagpur@gmail.com

Removing dots in listview item

rajesh_ncc12-Jan-09 19:15

rajesh_ncc

12-Jan-09 19:15

Hi Bharat

Am using to create the installer what we have in visual studio 2005
(Deployment)

Regards

K. Rajesh Kumar

i am a fresher in software development i have so many doubts in .net so i need to ca

Prasadsm11-Jan-09 23:56

Prasadsm

11-Jan-09 23:56

Hi All,

Here i am using listview,it displays the listviewitems along with three dots at the end of every item. Is it possible to remove these dots? if yes,how can it be done? can you guide me please...

Thank you..

Re: Removing dots in listview item

Eddy Vluggen12-Jan-09 0:35

Eddy Vluggen

12-Jan-09 0:35

I guess that there is more text in the item than will fit in the ListView? You could consider shortening the text in the ListViewItem, or use owner-drawing Smile | :)

I are troll Smile | :)

Re: Removing dots in listview item

Prasadsm12-Jan-09 2:16

Prasadsm

12-Jan-09 2:16

Thanks Eddy.. Smile | :)

database in a network

hrishiS11-Jan-09 22:53

11-Jan-09 22:53

Hi to all Experts, Smile | :)

I have a MS access database (.mdb) in a server, which I am going to access from several clients( VB application )(for each clients the operation are just opening it reading/updating it, and closing it quickly).

So, when i access it simultaneously, i wonder,

1. is there any chances my database will crash?, If so, what is the solution to avoid it?
2. or does MS access has its own solution to concurrency problem or does it have any locking mechanism, to avoid crashing?

Thanks in advance : Smile | :)

Aman Bhullar11-Jan-09 23:14

Aman Bhullar

11-Jan-09 23:14

Member 4250705 wrote:
1. is there any chances my database will crash?, If so, what is the solution to avoid it?

There is no chance of system crash.

Member 4250705 wrote:
or does MS access has its own solution to concurrency problem or does it have any locking mechanism, to avoid crashing?

MS Access has it own locking mechanism

hrishiS11-Jan-09 23:22

11-Jan-09 23:22

thanks aman,
So I need not to think for any synchronization or locking mechanism right?

Also could you please tell me, what about the running a single file(ppt) as like the same above, ie. am trying to run a ppt file from all client simultaneously using new processes for all of them separately ie

on buttonClick i wrote the following code::

dim p as process
p.startinfo.filename="//server/c:/path/filename.ppt"
p.start()

Steven J Jowett12-Jan-09 1:50

Steven J Jowett

12-Jan-09 1:50

Member 4250705 wrote:
So I need not to think for any synchronization or locking mechanism right?

Depends if you are using a disconnected DataSet or not. If you are then you will need to handle updates in some form or other.

Access will only lock the record for as long as the connection remainds open.

Member 4250705 wrote:
p.startinfo.filename="//server/c:/path/filename.ppt"

The file path is wrong, but the logic is sound.

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

Eddy Vluggen12-Jan-09 0:40

Eddy Vluggen

12-Jan-09 0:40

Member 4250705 wrote:
1. is there any chances my database will crash?, If so, what is the solution to avoid it?

There is no easy solution. If there were, Microsoft would have added it to Access itself. Your database will not crash, but data may be lost.

Member 4250705 wrote:
2. or does MS access has its own solution to concurrency problem or does it have any locking mechanism, to avoid crashing?

Access is not a server-technology. I believe that Access uses optimistic locking, and it gets very slow once there's a lot of data.

You can easily upgrade your MS-Access database to a complete SQL-Server database. There's a free version of SQL Server called "SQL Server Express", and you can use the Wizard in Access to convert your database to a "real" server-database.

Hope this helps,

I are troll Smile | :)

Wendelius12-Jan-09 12:02

Wendelius

12-Jan-09 12:02

Member 4250705 wrote:
is there any chances my database will crash?, If so, what is the solution to avoid it

The database won't crash if it's used simultaneously. It's designed for that. One possible reason when Access db could crash is that you have several clients using the database with different versions of drivers (odbc, jet, whatever you use). Sometimes different versions are not compatible with each other and this can lead to problems and corruptions.

Also the database itself cannot crash since there actually is no true database, just a file and a driver at client side. But still the file may corrupt.

Member 4250705 wrote:
or does MS access has its own solution to concurrency problem or does it have any locking mechanism, to avoid crashing

Again no crashing will occur if several users update the same data. When exactly the same data is updated by 2 users at the same time, the first one who finishes the operation gets his data into the database and the second one gets an error message to the client saying that someone has already modified the data. This behaviour happens if the record locking is set to No locks (optimistic).

If the record locking is set to Edited records, then pessimistic locking is used. Now with the same example if the first user starts to edit the row, the second user cannot edit the row until the first one has finished the operation.

As Eddy Vluggen said, you can migrate to SQL Server Express Edition in order to use a true relational database instead of a 'flat-file' storage (Access). For more info: http://www.microsoft.com/express/sql/default.aspx[^]

The need to optimize rises from a bad design.My articles[^]

hrishiS12-Jan-09 17:15

Hide Process from Task Manager

12-Jan-09 17:15

guys,
Sincere thanks to all of you for your valuable reply.
Thanks a lot again

Anubhava Dimri11-Jan-09 20:07

Anubhava Dimri

11-Jan-09 20:07

Hi All,

How can i hide process of my application from Task manager.
Pls help it's needful.

Thanks
Anubhava Dimri

mailto: anubhava.prodata@gmail.com

Guffa11-Jan-09 20:15

Guffa

11-Jan-09 20:15

The answer hasn't changed since you asked this the last time.

Despite everything, the person most likely to be fooling you next is yourself.

hrishiS11-Jan-09 20:17

11-Jan-09 20:17

I guess you can use showInTaskbar method
eg:
to hide a form,
me.showInTaskbar=false

I think that will work fine

Anubhava Dimri11-Jan-09 20:38

Anubhava Dimri

11-Jan-09 20:38

I am saying abount Process of Application not about Application Task.

mailto: anubhava.prodata@gmail.com

Bharat Jain11-Jan-09 20:48

Bharat Jain

11-Jan-09 20:48

Hi,
I have tried this n VB (not in .net) by taking a help of an article on code guru , follow the link for the article
http://www.codeguru.com/forum/showthread.php?t=406555[^]

I worked in my case , hope this helps you too.

-Regards
Bharat Jain
bharat.jain.nagpur@gmail.com

Dave Kreskowiak12-Jan-09 2:20

Dave Kreskowiak

12-Jan-09 2:20

Excuse me, but that doesn't hide your process from Task Manager. It just STOPS Task Manager from updating it's list and disables the options to unpause it.

Now, think about this. What possible legitimate use does this have??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Crystal Reort for vb.net2005 with MS ACESS

EliottA12-Jan-09 2:45

EliottA

12-Jan-09 2:45

None, but this is going to cause a string of questionable questions from this user now that he has this snippet of code.

hrishiS11-Jan-09 19:53

Re: Crystal Reort for vb.net2005 with MS ACESS

11-Jan-09 19:53

Hi to All,
Here I come with another problem.
I am using Crystal Report with VB.NET 2005. Now, I have a MS ACCESS database ( which will be in a fixed folder say (c:\Mydatabase\aa.mdb). To deploy my project, I need to load the paths of the report dynamically. My connection String for the project wont be having any problem, since my path to the database is fixed.
For my Crystal Report, what are the consideration I should make, so that after installing my project in any machine, it should work ( NOTE that I will copy the database in the same path).
Do I have to copy the xx.rpt to any specific folder while deploying? What will be the string path look like then?
Please help me with all the details.

Regards,
Himangshu

Anubhava Dimri11-Jan-09 20:34

Anubhava Dimri

11-Jan-09 20:34

Hi,

At the time of report generation you can set the path of Crystal Report which you want.
Example are given below.

Dim rpt As CRAXDRT.Report
rpt = crx.OpenReport(application.startuppath & "\Report3.rpt")

mailto: anubhava.prodata@gmail.com

Re: Crystal Reort for vb.net2005 with MS ACESS

hrishiS11-Jan-09 22:03