Urgent connection pooling - Visual Basic Discussion Boards

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Re: Updating a control via a Thread

Luc Pattyn31-Jul-07 1:15

Luc Pattyn

31-Jul-07 1:15

Since all Controls normally get created by the main thread (aka "GUI thread")
and should be handled only by the thread that created them (they are not
thread-safe), one needs a special technique to access them from another thread.

The Control class has some members to support this: the InvokeRequired property
and the Invoke() or BeginInvoke() methods. I suggest you read up on these;
examples are plenty on CodeProject. There is one in my Sokoban article (that's
in C# but the concept is exactly the same).

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Set focus to a tabpage

Sadiq Parker31-Jul-07 0:40

Sadiq Parker

31-Jul-07 0:40

How can set focus to a particular tabpage in vb.net 2005

Re: Set focus to a tabpage

Christian Graus31-Jul-07 0:47

Christian Graus

31-Jul-07 0:47

Isn't there a selected tab property ? Assuming you're asking about winforms.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Set focus to a tabpage [modified]

Tom Deketelaere31-Jul-07 1:39

Tom Deketelaere

31-Jul-07 1:39

indeed there is

and the code would look like this

tabcontrolname.selectedtab = tabpagename

-- modified at 7:57 Tuesday 31st July, 2007

you could also use selectedindex but then this will stop working properly if you change the order of the tabs

Re: Set focus to a tabpage

SamRST31-Jul-07 4:12

SamRST

31-Jul-07 4:12

really , thnks my frnd .. its working

Re: Set focus to a tabpage

Tom Deketelaere31-Jul-07 4:47

Tom Deketelaere

31-Jul-07 4:47

glad to be of assistence Big Grin | :-D

Re: Set focus to a tabpage

SamRST31-Jul-07 4:13

SamRST

31-Jul-07 4:13

really thnks my frnd.. its working..

Urgent connection pooling

viralbhatt30-Jul-07 23:09

viralbhatt

30-Jul-07 23:09

Hello,

first of all I am new to .net and don't know much about connection pooling. I have read few articles from .net but still don't get answer for few questions.

my boss came to me and told me to do some research on connection pooling and write application that will have six buttons. three button will get connection from pool and other three button will close this connection one by one. I wanted to put one more button to destroy all connection that works fine using Clearallpools but clearpool doesn't work. I can post code here if anyone want to look at it.

Thank you.

Viral

Re: Urgent connection pooling

Christian Graus31-Jul-07 0:23

Christian Graus

31-Jul-07 0:23

.NET handles it's own connection pooling, you should not write your own.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Urgent connection pooling

viralbhatt31-Jul-07 0:49

viralbhatt

31-Jul-07 0:49

thank you for your reply.

I am not writing my own pooling, just want to know how can I handel pooling and monitor it. I just want to know how it works and what type of problem I can get if we develop project using connection pooling. it will be great if someone tells me if there are any other connection type available for .net.

Re: Urgent connection pooling

Naji El Kotob31-Jul-07 0:55

Naji El Kotob

31-Jul-07 0:55

Hi,

I hope first you are using a support pooling database (e.g. MS SQL), you can think about pooling as objects that are always ready to answer your (client) connection requests (in case they are available). This is good technique when you have a number of concurrent users. to simplify the issue:

You can enable/disable pooling via ConnectionString ADO.NET 2.0 introduces ClearAllPools http://msdn2.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.clearallpools(VS.80).aspx[^] and ClearPool http://msdn2.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.clearpool(VS.80).aspx[^] methods to clear the pool.

In addition you will need to read more about Close and Dispose of XxxConnection object (e.g. SQLClient.SQLConnection) http://msdn2.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection(vs.80).aspx[^]

This article could help http://www.ondotnet.com/pub/a/dotnet/2004/02/09/connpool.html[^]

hope this helps, best wishes Smile | :)

NajiCo http://www.InsideVB.NET[^]

It's nice 2b important, but it's more important 2b nice...

Re: Urgent connection pooling

Naji El Kotob31-Jul-07 1:05

Naji El Kotob

31-Jul-07 1:05

Hi Again,

This is a good article http://msdn2.microsoft.com/en-us/library/8xx3tyca(VS.80).aspx[^] Wink | ;)

NajiCo http://www.InsideVB.NET[^]

It's nice 2b important, but it's more important 2b nice...

Verbatim literal

LishaDamian30-Jul-07 22:11

LishaDamian

30-Jul-07 22:11

What is the syntax to represent Verbatim literal(@ in C#) in VB.net ?

Re: Verbatim literal

Dave Kreskowiak31-Jul-07 2:50

Dave Kreskowiak

31-Jul-07 2:50

There isn't any. All strings denoted by quotes are literal. There are no escape characters in VB.NET.

A guide to posting questions on CodeProject[^]

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

Re: Verbatim literal

Dave Doknjas31-Jul-07 13:45

Dave Doknjas

31-Jul-07 13:45

Actually, there is one escape character - a double quote is escaped by another double quote.
e.g., Dim s As String = "abc""def"

David Anton
http://www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
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Re: Verbatim literal

Dave Kreskowiak31-Jul-07 16:52

Dave Kreskowiak

31-Jul-07 16:52

Whoops, forgot about that one! :->

A guide to posting questions on CodeProject[^]

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

problems while taking a screen shot

Ahmad Zaidi30-Jul-07 22:10

Ahmad Zaidi

30-Jul-07 22:10

Hi,

I am trying to take a screen shot of a site loaded in a web browser control. I have placed the code in the document completed event and use the forms DrawToBitmap function to draw it and save the image. i have also verified whether the document has been fully loaded by verifying the url in the WebBrowserDocumentCompletedEventArgs and the readystate property of the control. But to my surprise, it is working fine with a couple of sites, e.g. www.lumun.org and www.nelaam.com but when i try it with google.com,ask.com or msn.com, I ust end up getting a plain white bitmap. I have even tried putting a 60 second time delay ( as i thought that maybe the site takes some time to be loaded and made visible), and could see the page in the web browser control, yet the bitmap for these sites was still plain white :S Any ideas as to why this could be? and what the solution to this is?

Thanks!
Ahmad

datetime control is creating problem

Sonia Gupta30-Jul-07 21:58

Sonia Gupta

30-Jul-07 21:58

there exist two parameters in the datetime control
momth and year
Format Custom
Custom Format - MMM-yyyy

When i try to change the date it gives the following error
Year, Month, and Day parameters describe an un-representable DateTime.

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: datetime control is creating problem

Tom Deketelaere30-Jul-07 23:00

Tom Deketelaere

30-Jul-07 23:00

you're problem is the folowing:

today we are the 31th and while you don't display the day the control still has it in his 'memory'
so when you try to go to a month with only 30 day's (for instance june) you are actualy trying to go to '31 june 2007' and that date doesn't exist so he can't display it and gives you're error.

If you really don't want to show the day then I suggest you catch the 'valuechanged' event and check the day

if day=31 then
if month = june then
day = 30
end if
end if

hope this helps

How to hide the startup form

Amer Rehman30-Jul-07 21:17

Amer Rehman

30-Jul-07 21:17

Can anybody tell me how to make the startup form invisible. The following code snippet in the included MSDN help displays the form for a while and then the form is closed automatically.

' Visual Basic
Sub Main()
' Instantiate a new instance of Form1.
Dim f1 as New Form1()
' Display a messagebox. This shows the application is running,
' yet there is nothing shown to the user. This is the point at
' which you customize your form.
System.Windows.Forms.MessageBox.Show( _
"The application is running now, but no forms have been shown.")
' Customize the form.
f1.Text = "Running Form"
' Show the instance of the form modally.
f1.ShowDialog()
End Sub

reman

Re: How to hide the startup form

Tom Deketelaere30-Jul-07 21:26

Tom Deketelaere

30-Jul-07 21:26

f1.hide = hides the form (however when the form does an new action after the hide it will apear again)
so you might want to use

f1.visible = false

you can put this code in the load but if you want to make sure you're form is never displayed it might be beter to do it in the activated event

hope this helps

Re: How to hide the startup form

Luc Pattyn30-Jul-07 23:24

Luc Pattyn

30-Jul-07 23:24

Hi,

this is how I do it (example is C#):

[STAThread]
static void Main() {
	Application.EnableVisualStyles();
	Application.SetCompatibleTextRenderingDefault(false);
	Form1 form1=new Form1();
	// to remain hidden, we don't pass the form to App.Run();
	// as a consequence the form must perform an Application.Exit
	// when it quits, closes or receives a SessionEnding event.
	Application.Run();
}

So don't hand over your main form to Run() since that would show it, no matter
what you do to the form's properties.
And be careful to deal with all normal exits PLUS the sessionending stuff
(which normally Run would handle).

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Re: How to hide the startup form

Naji El Kotob31-Jul-07 1:10

Naji El Kotob

31-Jul-07 1:10

Hi,

It seems that your are trying to build a SplashScreen, if this is what you want:
Go to Project > Add New Item > Splash Screen ... add your touches + Coding Wink | ;)

Go to Project > ProjectName Property > Application tab > Splash Screen Drop Down List and select the added form (this will be launched first)

hope this helps Smile | :)

NajiCo http://www.InsideVB.NET[^]

It's nice 2b important, but it's more important 2b nice...

Re: How to hide the startup form

Joseph Guadagno31-Jul-07 9:47

Joseph Guadagno

31-Jul-07 9:47

There is a good article here on CodeProject at http://www.codeproject.com/csharp/prettygoodsplashscreen.asp on creating a splash screen. I have used it in past applications.

Here are some of my articles.
Hope this helps!
Joseph Guadagno
http://www.josephguadagno.net

slider and the ruler

eyes200730-Jul-07 21:02

eyes2007

30-Jul-07 21:02

hi all

i need to use a slider on the ruler control but i have no idea how to do that will some one help me on the same

any kind of help will be greatful

thnx in advance

Last Visit: 31-Dec-99 18:00 Last Update: 11-Jun-24 5:54

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