Visual Basic

cylix200019-Jan-06 13:57

19-Jan-06 13:57

I know what you mean actually,
but the number of memory shown on the task manager will shown to the end user.
Can I make the number shown on Task Manager is also low?

Dave Kreskowiak19-Jan-06 15:02

Dave Kreskowiak

19-Jan-06 15:02

cylix2000 wrote:
but the number of memory shown on the task manager will shown to the end user.

So what?

cylix2000 wrote:
Can I make the number shown on Task Manager is also low?

Not without calling the GarbageCollector directly. This is never done, unless you have a really good reason for doing it and know the consequences are! Doing this "just because I don't want my customer to think my app is a memory hog" is not good enough. The GC is self-tuning. You WILL cause your app major performance problems by constantly forcing the GC to run early.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

shiroamachi19-Jan-06 15:40

shiroamachi

19-Jan-06 15:40

Dave Kreskowiak wrote:
cylix2000 wrote:
but the number of memory shown on the task manager will shown to the end user.

So what?

IMHO
It did happen alot, customers asking about our application perfomance, especially when we were selling the application. They will start saying something like "my old program or another program ( using another language ) didnt behave like this. are you sure your program is ok?". And then they start to "feel" that when running our application, they computer run slower. And also customers, most of them, didnt have IT background. Explaining them about what behind it, is sometime useless. What they see is what they believe.

The result of this are unsatisfied customer and a change of loosing business opportunities.
That's why a lot of people been asking and they will keep asking about it in the future. In CP forum itself, almost everyday there's a question about it.

CMIIW

WiL

Form Screen becomes blank during processing

Steve Pullan19-Jan-06 17:29

Steve Pullan

19-Jan-06 17:29

shiroamachi wrote:
They will start saying something like "my old program or another program ( using another language ) didnt behave like this. are you sure your program is ok?". And then they start to "feel" that when running our application, they computer run slower.

This is a consequence of the environment and tools you are using - in this case Microsoft Windows, .NET Framework and VB. There are ways around it but they ALL include either rewriting the program in a different language or using different libraries or both. I know one guy who does all his own programming and never uses the framework nor the VC++ class libraries. As a consequence he has very compact and efficient code BUT it takes him MUCH MUCH longer to write, debug etc. That's the tradeoff by using rapid application development tools. (BTW, Microsoft is not the only supplier of resource-hungry dev tools.)

shiroamachi wrote:
And also customers, most of them, didnt have IT background. Explaining them about what behind it, is sometime useless. What they see is what they believe.

I know what you mean. Non-IT trained (savvy) people never understand, but most of them never understand how an internal combustion engine works either since they are not trained mechanics but they still drive them to work everyday.

shiroamachi wrote:
The result of this are unsatisfied customer and a change of loosing business opportunities.
That's why a lot of people been asking and they will keep asking about it in the future.

This is the job of the pre-sales guys and sales reps. They should properly manage the customer's expectations and be ready for the inevitable "why is it so" questions.

shiroamachi wrote:
In CP forum itself, almost everyday there's a question about it.

Yes, sadly not many developers understand it either.

...Steve

"Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." (Translation: I'll show you the way, but not write the code for you.) I read that somewhere once Smile | :)

mayhem_rules18-Jan-06 21:59

18-Jan-06 21:59

In VB.NET, when some huge data processing is going on, the form turns blank (Nothing is visible to the user, sort of hangs). However, the processing goes on correctly and the form becomes normal after the processing is completed. Can someone tell me how this can be prevented. Thnx...

With Best Regards,

Mayur

Owner drawn18-Jan-06 22:18

Owner drawn

18-Jan-06 22:18

mayhem_rules wrote:
when some huge data processing is going on

Use a thread for processing this data.

You are doing processing in the main GUI thread. Hence it hangs.

Branch out the processing onto a different thread. You'll see the difference.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

mayhem_rules18-Jan-06 22:26

18-Jan-06 22:26

Thnx for your reply. Since I am relatively new to .NET, I really do not have much idea about threading. Could you explain it to me or provide some samples. Also, I am using a progress bar to try and keep the screen active. But no luck. Thnx a lot.

With Best Regards,

Mayur

-- modified at 4:32 Thursday 19th January, 2006

Owner drawn18-Jan-06 22:50

Owner drawn

18-Jan-06 22:50

It's simple.

Create a simple sub procedure that will do the processing. Pass the address of the sub procedure to the thread.

Now start the thread.

Private MyThread as Thread

MyThread = new Thread(AddressOf MyThreadProc)

MyThread.Start()

Sub MyThreadProc()
'write your long task here
'if you have to repeat a task wrap it inside a while loop with a flag 
'controlling it. To stop the loop unset the flag.
End Sub

Simple!

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

mayhem_rules19-Jan-06 2:05

What Object to make image Button ?

19-Jan-06 2:05

Thnx a lot, I will try it out an let u know.

With Best Regards,

Mayur

cylix200018-Jan-06 21:37

Re: What Object to make image Button ?

18-Jan-06 21:37

How to make a image button ?
How to make some rounded corner text field?

Thanks

Owner drawn18-Jan-06 22:22

Owner drawn

18-Jan-06 22:22

cylix2000 wrote:
How to make a image button ?

What is that?

Put an image onto a button. Button has the image property. Select an image.

cylix2000 wrote:
How to make some rounded corner text field?

You've got to paint it like that.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Export DataGrid Data To Excel

mayhem_rules18-Jan-06 19:27

18-Jan-06 19:27

I am using VS.NET 2003 / Windows XP. I want to export the data displayed in the datagrid into EXCEL. I have checked that 'Microsoft Excel 11.0 and 5.0 Object Library' is present in Add Reference. Can someone provide code for the same.

With Best Regards,

Mayur

_mubashir18-Jan-06 21:59

_mubashir

18-Jan-06 21:59

You can simply use the dataset and write it as xml

<br />
Dim fs As New System.IO.FileStream("c:\myfile.xls", _<br />
                System.IO.FileMode.Create)<br />
<br />
'Create an XmlTextWriter for the FileStream.<br />
Dim xtw As New System.Xml.XmlTextWriter(fs, _<br />
System.Text.Encoding.Unicode)<br />
xtw.WriteProcessingInstruction("xml", "version='1.0'")<br />
datasetname.WriteXml(xtw)<br />
xtw.Close()<br />

the above code will write a file c:\myfile.xls

Regards
Mubashir

mayhem_rules18-Jan-06 22:30

18-Jan-06 22:30

Hi Mubashir, thnx for your reply. I used the code provided above. It creates a myfile.xls file in c drive. Since the data size is huge, the file size is 24 mb. However, when I try to open the file, the screen just displays importing data or opening. However, nothing is displayed in excel eventhough I have waited for a long time. Please help me out.

With Best Regards,

Mayur

abhinish19-Jan-06 1:15

abhinish

19-Jan-06 1:15

hey check this link out:

http://www.codeproject.com/vb/net/Data_Extract.asp[^]

it should work as it worked for me..

abhinav

mayhem_rules19-Jan-06 2:04

19-Jan-06 2:04

Hi Abhinav,

I have already gone through the link provided in your reply. However, there are some issues that I have with the steps provided.
I am using VS.NET 2003 / Windows XP / Office 2003
In the following steps,

Dim excelApp As New Excel.Application
Dim excelBook As Excel.Workbook = excelApp.Workbooks.Add
Dim excelWorksheet As Excel.Worksheet = _
CType(excelBook.Worksheets(1), Excel.Worksheet)

I have added a reference to Excel 10.0 Object. However, it displays error message for the above code.
For the line, Dim excelApp As New Excel.Application, the options provided is _Application.
Also for, Dim excelBook As Excel.Workbook = excelApp.Workbooks.Add, there is no workbooks.add property available.

Can you help me out with this. It is very important for me. Thnx a lot for your concern.

With Best Regards,

Mayur

abhinish19-Jan-06 18:09

abhinish

19-Jan-06 18:09

i did it like this:

Dim excelApp As Object<br />
           Dim excelBook As Object<br />
           ' to Workbook to Worksheet.<br />
           excelApp = CreateObject("Excel.Application")<br />
           excelBook = excelApp.Workbooks.Add<br />
           Dim excelWorksheet = excelBook.worksheets(1)<br />
           excelApp.Visible = True

try it

abhinav

Mutiple Selected Listbox

cylix200018-Jan-06 18:53

Re: Mutiple Selected Listbox

18-Jan-06 18:53

I have a listbox which can multiple select.
How can I get the newest selectItem ?
I means I have already select 2 item, how can I get the last item i selected?
Suppose the user may random select.

Muhammad Javed Khan18-Jan-06 19:03

Muhammad Javed Khan

18-Jan-06 19:03

'Declare a form level variable as

Inherits System.Windows.Forms.Form
Private lstLastItem As Integer

'Move the index of selected item of list box into the lstLastItem

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
lstLastItem = ListBox1.SelectedIndex
End Sub

Re: Mutiple Selected Listbox

cylix200018-Jan-06 20:48

Re: Mutiple Selected Listbox

18-Jan-06 20:48

<br />
lstLastItem = ListBox1.SelectedIndex<br />

SelectedIndex seems always return the smallest one.
Not that Laterest one.
That is when I select index 0 item and then select index 1 item,
It also return index 0 but not the laterest index 1...

anyway, Thank you

Muhammad Javed Khan18-Jan-06 22:05

Muhammad Javed Khan

18-Jan-06 22:05

'Declare a form level variable as

Inherits System.Windows.Forms.Form
Private lstLastItem As Integer

'Move the index of selected item of list box into the lstLastItem

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
lstLastItem = ListBox1.SelectedIndex
End Sub

lstLastItem will contain the last index if u want to access the last selected item u may access it as

MsgBox(ListBox1.Items.Item(lstLastItem))

Invalid printer specified

misecprj18-Jan-06 18:37

misecprj

18-Jan-06 18:37

Hello All,

i have made a windows application in vb.net and developed reports in crystal reports which is in visual studio.

Then i installed my application on 42 different locations. In these 35 locations are generating the printout of the reports from their default printer. But 7 locations are generating this error:CrystalDecisions.CrystalReports.Engine.FormatEngine: "Invalid printer specified."
Can anybody help me how to solve it.

misecprj

Re: Invalid printer specified

Dave Kreskowiak19-Jan-06 6:08

Dave Kreskowiak

19-Jan-06 6:08

Your best bet is to Google for "Crystal Reports Invalid Printer Specified", and you'll come up with lots of hits, and lots of hints. All you have to do is start reading and see what fits your codes situation.

Here's[^] a freebie to get you started.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Form size

mayhem_rules18-Jan-06 18:10