Visual Basic

Re: How to validate dataview is NULL

10-Apr-05 23:15

I want to chech whether a dataset is blank or there are any record in it ?

A sample code will be more helpful.

Thanks

Ritesh123411-Apr-05 1:44

Ritesh1234

11-Apr-05 1:44

Hi,
U can check the Dataset or Datatable whether they have any data(Rows) in it as follows..........

If Not dsNewData Is Nothing Then<br />
                If dsNewData.Tables.Count > 0 Then<br />
                    If Not dsNewData.Tables("TableName") Is Nothing Then<br />
                    'If u want u can check for dsNewData.Tables("TableName").Rows.Count>0<br />
                        MessageBox.Show("Table has :" & dsNewData.Tables("TableName").Rows.Count & " Rows")<br />
                    End If<br />
<br />
                End If<br />
            End If

I hope this will help u..............

Regards,
Ritesh

How to fetch rows from a dataview?

Suman Singh10-Apr-05 23:14

10-Apr-05 23:14

I m trying to fetch rows from dataview.

Can anyone help me?

A sample code will be more helpful.

Thanks

Ritesh123411-Apr-05 1:40

Ritesh1234

11-Apr-05 1:40

Hi,
U can access the records detail from dataview as follows.......

For intRowIndex = 0 To pi_dtTable.DefaultView.Count - 1<br />
        MessageBox.Show(pi_dtTable.DefaultView.Item(intRowIndex).Item("ColName"))<br />
    Next

I hope this will help u...........:->

Regards,
Riesh

Suman Singh11-Apr-05 11:43

11-Apr-05 11:43

Hi Ritesh,

Thanks for your all reply.

Can you please let me know,

what have u declared these variables as:

intRowIndex
pi_dtTable

Anonymous11-Apr-05 22:38

11-Apr-05 22:38

hello

Private inrowindex as integer
Private pi_dtTable as datatable

whatever the modifier you want use it Smile | :)

Suman Singh14-Apr-05 11:49

Re: Change line in text file

14-Apr-05 11:49

ok...

dim dv as dataview

dv.rowsfilter = "id like 'C%'

Now i want to fetch one record from this dataview..

Please remember i have done this with datatable and dataset..

Thanks in advance for your reply.

Suman Singh

printing using tcp/ip

confirmnot10-Apr-05 22:34

confirmnot

10-Apr-05 22:34

Hi i have beening to send the following codes to a printer connected to my pc through an ethernet hub, but i could not be able to print a printer-ready data successfully. it only printed out rubbish value

Can anyone help me here?

(the printer ready data are a series of strings that contain Printer Control language which the printer can understand. It the string has been tested by sending it through a parallel port, and it proved it can be read by the same printer.)

Dim Buffer() As Byte
Dim oEncoder As New System.Text.ASCIIEncoding
Dim oEnc As System.Text.Encoding = oEncoder.GetEncoding(1252)
Buffer = oEnc.GetBytes(Chunk)

Dim client0 As New System.Net.Sockets.TcpClient("169.254.192.155","9100")

Dim stream As System.Net.sockets.NetworkStream = client0.GetStream()

stream.Write(Buffer, 0, Len(Chunk))

client0.Close()
stream.Close()

Change line in text file

johnjsm10-Apr-05 22:32

johnjsm

10-Apr-05 22:32

Hi,
Could anyone help me. I need to read through a text file to find a certain line of text that remains the same and then change it to a different line of text and save it. I am using VB 6 but having no luck.
If anyone could help it would be great.
Thanks

Dave Kreskowiak11-Apr-05 1:22

Dave Kreskowiak

11-Apr-05 1:22

Unless the change you make is exactly the same length as what you're replacing, you'll have to read in the entire file, make the change, and write the entire file back out.

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

Datgrid Column style

Anonymous10-Apr-05 21:31

10-Apr-05 21:31

Can the style/font/color of a header in a datagrid be changed selectively using VB.NET? If Yes, How?

Re: Datgrid Column style

Suman Singh10-Apr-05 23:11

Please help to solve this error "ActiveX Component Can't create Object".

10-Apr-05 23:11

Right click on the datagrid and select autoformat...

It will help you a bit...

Murtuza Husain Miyan Patel10-Apr-05 20:34

Murtuza Husain Miyan Patel

10-Apr-05 20:34

Dear Sir,
I am exporting picture from a picture box to the power point slide. but when i m reaching line code
ActivePresentation.Slides.Paste
i am getting error no Run time error 429
"ActiveX Component Can't create Object".
Please help me by checking the below code.

i m giving the refence of Ms Power Point 11.0 Object Library.

Dim ppApp As PowerPoint.Application
Dim ppPresentation As Presentation
Dim ppSlides As Slide
Set ppApp = New PowerPoint.Application
ppApp.Visible = True
Set ppPresentation = ppApp.Presentations.Add
ppPresentation.Slides.Add 1, ppLayoutTitle
Clipboard.Clear
Clipboard.SetData Picture1.Image
ActivePresentation.Slides.Paste

Thanks
Murtuza Patel

collision detection, why doesnt this work?

bloodybunny10-Apr-05 19:45

bloodybunny

10-Apr-05 19:45

Hey, im fairly new to VB.net and am coding a game of sorts which requires Collision detection
the way i have set it up is that whenever "pic" moves 4 functions check to see if it is in collision with "wall"
this is one of the functions, it checks to see if it has collided on the right side

Function cd1()
If (pic.Left + pic.Width) = wall.Left Then
If pic.Top < wall.Top Then
If (pic.Top + pic.Height) > (wall.Top + wall.Height) Then
'MsgBox("IT WORKS")
Dim Form10 As Form10
Dim Form1 As Form1
Form1 = New Form1
Form1.Show()
Me.Hide()
End If
End If
End If
End Function

Hand please

Dll Entry Point not Found

jatin.mehta@gmail.com10-Apr-05 19:04

jatin.mehta@gmail.com

10-Apr-05 19:04

I m using wininet.dll in my vb application.

My application was working fine but some how it is giving me error that
Run-time error '435':
Can't find DLL entry point HttpsendRequestA in wininet.dll.

Any body can help me.

Thanks in advance

Jatin Mehta

Validation on datagrid

Mr Dabbah10-Apr-05 10:13

Mr Dabbah

10-Apr-05 10:13

hello, how can i validate the data entered in the data grid before sending it to the database???

Re: Validation on datagrid

Anonymous10-Apr-05 11:26

set & retrive data from an image

10-Apr-05 11:26

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbtskhandlingerrorswithwindowsformsdatagridcontrol.asp

gopi_nkrishna10-Apr-05 5:27

gopi_nkrishna

10-Apr-05 5:27

hi all i am doing a project in steganography
for this i need to set & retrive data (a string) to an image
plz can anyone help me with this
i would be thankful to them

Re: set & retrive data from an image

Anonymous10-Apr-05 6:01

10-Apr-05 6:01

http://www.codeproject.com/csharp/steganodotnet.asp

Steganography - Hiding messages in the Noise of a Picture
By Corinna John

http://www.codeproject.com/script/profile/whos_who.asp?id=475133

sendkeys.send("{BS}")

vertig073010-Apr-05 2:21

vertig0730

10-Apr-05 2:21

I want to send this to a textbox but when i put it in a button_click It doesnt work. I need to link it to the textbox but i cant fingure it out.

James Kennelly

Dave Kreskowiak10-Apr-05 4:15

Dave Kreskowiak

10-Apr-05 4:15

You must give the focus to the control you want to send the keystrokes to. Using this method isn't recommended because it's not a completely reliable way to send keystrokes.

In order for it to work, you must give the application/control the focus, then send the keystrokes. But, in a multitasking environment like Windows, the focus can move from control to control and application to application at any time. This includes the time between when you set the focus and the time you send the keystrokes, even if SendKeys is the very next statement!

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

vertig073010-Apr-05 12:41

vertig0730

10-Apr-05 12:41

well ginving the text box focus works i only need it for a second. But it wipes out the entire contents of the textbox because of the focus it selects all.
so had to play a game and came up with

TextBox1.Focus()
SendKeys.Send("{right}")
SendKeys.Send("{backspace}")

works so I like it!

James Kennelly

Dave Kreskowiak10-Apr-05 15:10

Dave Kreskowiak

10-Apr-05 15:10

vertig0730 wrote:
well ginving the text box focus works i only need it for a second.

That's what I thought too... until it hit production! Out of 15,000 machines, some are garanteed to find that little second and mess it up for you.

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