Visual Basic

3-Oct-06 20:11

I've got what should be an easy question, but I can't find the correct combination in VB.NET.
I have a drop down list of numbers in a combo box. When I leave the form, I want to know which number was chosen.
NumSamp.SelectedIndex()
tells me which index I've chosen, but I can't get the integer or text value of the entry.
NumSamp.SelectedText() or NumSamp.SelectedValue() both come back as nothing.

There must be an easy way to get the value of the chosen entry, but I can't seem to find it.

Thanks,
Ilan

whoispiyush3-Oct-06 20:33

whoispiyush

3-Oct-06 20:33

why can't you use

Request.form("id of combobox").value

it returns index of number selected by user when he leaves the form

use

document.all("idofcombobox").value in javascript for same value without post back form

IlanTal3-Oct-06 20:53

3-Oct-06 20:53

Visual Basic doesn't understand "Request" and since I've never used it, neither do I.
While I'm still in the form, I have the combo box. It is called NumSamp.
It seems to me that I ought to be able to query NumSamp in some easy way to find out which value in a list of values was chosen.
In fact, NumSamp.SelectedIndex() gives me the correct offset in the list of values. I'm just missing the next step: given the index, what is the value of the entry?

Thanks,
Ilan

whoispiyush4-Oct-06 16:55

whoispiyush

4-Oct-06 16:55

NumSamp.SelectedIndex.value

will solve your problem

IlanTal4-Oct-06 19:43

4-Oct-06 19:43

Thanks for your kind answer.

Dave Sexton3-Oct-06 21:55

Dave Sexton

3-Oct-06 21:55

Use NumSamp.SelectedItem. If you're coding with Option Strict On use the .ToString() method as well.

Sample

Private Sub Button1_Click(...) Handles Button1.Click
        'pass value of selected item to Form2
        Dim frm2 As New Form2
        frm2.Text = Me.ComboBox1.SelectedItem.ToString
        frm2.Show()
    End Sub

IlanTal3-Oct-06 22:50

How to select specific data from textfile

3-Oct-06 22:50

Thanks,
It was under my nose all the time and somehow I missed it.
As I expected, it is really easy.

TeiUKei3-Oct-06 17:23

3-Oct-06 17:23

Let say i have the data below in a textfile call testing.txt
No,Title
1,Information
2,Error message
3,Question

Now, how can i specify,get and display the second line data? Confused | :confused:

I would appreciate so much for help!!

Christian Graus3-Oct-06 18:07

Christian Graus

3-Oct-06 18:07

If it's the second line, you can read a line at a time and use the second one. Or you can use a regex to parse the data.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

TeiUKei3-Oct-06 18:48

3-Oct-06 18:48

Thanks for help, but can i have sample coding?

Christian Graus3-Oct-06 18:50

Christian Graus

3-Oct-06 18:50

System.IO.File.ReadXXX is the group of methods that are the easiest way to read a file into a string or group of strings.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

TeiUKei3-Oct-06 18:54

3-Oct-06 18:54

Sorry for the troublesome! This is some of my code which i only manage to get title as return. May i have some advice on it?

Private Function ReadTextFile(ByVal sFileName As String) As String

Dim s As String = String.Empty

Try
Dim oFile As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read)
Dim oReader As StreamReader = New StreamReader(oFile)

s = oReader.ReadLine()

oReader.Close()
oFile.Close()

ReadTextFile = s

Catch

ReadTextFile = "Unable to open file."

End Try

End Function

Steve :)3-Oct-06 21:14

Steve :)

3-Oct-06 21:14

Your problem is that you're only reading the first line of the file.

The ReadLine call needs to be a recurrent call, based on the return value of the method.

e.g. (from MSDN)

<br />
Dim input As String<br />
input = sr.ReadLine()<br />
While Not input Is Nothing<br />
   'Do something with the input<br />
   <br />
   'Read the next line of input<br />
   input = sr.ReadLine()<br />
End While<br />

This will continue to read the file until there is no further input returned by the ReadLine() call. Then you'll have to compare the returned input string to whatever you want to catch, either using a regex or a string constant (in the case of a marker string or something that won't change) to get the particular peice of info you're after. I would add do it something like this...

<br />
Dim input As String<br />
input = sr.ReadLine()<br />
While Not input Is Nothing<br />
  <br />
   If (input.CompareTo(stringConstant) = 0)<br />
      'do whatever with the data<br />
      input = Nothing<br />
   Else<br />
       input = sr.ReadLine() <br />
   End If<br />
End While<br />

TeiUKei3-Oct-06 21:19

uploading huge chunk file

3-Oct-06 21:19

Thank u, it really help a lot! Smile | :)

Jay Nathan13-Oct-06 15:17

Jay Nathan1

3-Oct-06 15:17

Hi all,
I have created application for uploading huge chunk file (min 1gb) to server(CONTENT MGMT SERVER).
File Size TIME
1.4 GB 22 Minutes
3.17 GB 32 Minutes

I am reading 10MB chunks for each partial write and utilizing maximum of 25 threads running at any point of time during execution. Can anyone help me to improve performance application.

I would appreciate, If anyone give me suggestion to improve performance of application.

Thanks,
Vijay Kumar
Email#jaydotnet@gmail.com

vijay

Re: uploading huge chunk file

Dave Kreskowiak3-Oct-06 18:28

Dave Kreskowiak

3-Oct-06 18:28

jaydotnet wrote:
Can anyone help me to improve performance application.

Upgrade to an OC48 line? Warning! Can be cut by any idiot with a backhoe.

jaydotnet wrote:
10MB chunks for each partial write and utilizing maximum of 25 threads

25 threads? For what?

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: uploading huge chunk file

Jay Nathan14-Oct-06 1:02

Jay Nathan1

4-Oct-06 1:02

Hi Dave,

I appreciate your reply.

I am using window application for uploading this huge data to content management server. when i try to transfer 1 huge chunk data (more than 1 gb) it take more than 1 hr to transfer. content mgmt server reads data byt 16kb and buffers in internal memory then writes to server. content management server group suggested us to read file into multiple slice and upload file using multi-threading(max 25 at any time). After doing this we had some performance improvement but no upto expectation.

if you need i can post my code.

thanks
Vijay

Re: uploading huge chunk file

Dave Kreskowiak4-Oct-06 2:03

Dave Kreskowiak

4-Oct-06 2:03

I see. It would appear that this is the best performance you're going to get. Not because of your code, but because of performance issues on the server side. If you're really good with a protocol analyzer, you can watch the traffic go by and look at the times it's taking for acknowledgement traffic to come back from the server.

Dave Kreskowiak
Microsoft MVP - Visual Basic

.NET DataTable Search

nlindley73-Oct-06 10:48

nlindley7

3-Oct-06 10:48

I need to be able to search a DataTable for a non-primary key field. I'd assume the best way is just to populate a dataset and fill the table. But how do I search the table for non-primary key values?

Nathan Lindley
.NET Aficionado

mr_lasseter3-Oct-06 13:29

mr_lasseter

3-Oct-06 13:29

Something along the lines of

<br />
for each datarow in datatable<br />
    if datarow.coumn(i) = searchvalue then<br />
        return what you want<br />
    end if<br />
next<br />

Mike Lasseter

nlindley74-Oct-06 3:18

nlindley7

4-Oct-06 3:18

I had played around with iterating the DataTable for the row, but was unsuccessful. I guess i'll play around with it a little more. Thanks.

Nathan Lindley
.NET Aficionado

zacharyshroyer4-Oct-06 3:36

zacharyshroyer

4-Oct-06 3:36

Dim dr() as DataRow

dr = datatable.Select("FieldName = 'something'")

dr will be an array of rows from the datatable that match the query.