Solved

Working with existing dataset  vb.net

Posted on 2014-12-29
5
196 Views
Last Modified: 2014-12-29
The dataset in a project (WSCGSoftwareDataSet) has only one table with a few columns. To upload SoftwareID and Title fields from this table into a list box (indexes 0 and 1):
       'create a table object
       Dim dt As New DataTable

       'create two columns
        dt.Columns.Add("SoftwareID", GetType(System.Int32))
        dt.Columns.Add("Title", GetType(System.String))

        ' add select columns from a table in the dataset to dt
        For Each r In WSCGSoftwareDataSet.Tables(0).Rows
            dt.Rows.Add(New Object() {r(0), r(1)})
        Next
       
        ' add dt to listbox datasource
        ListBox1.DataSource = dt

        ' identify display and value members of the listbox
        ListBox1.DisplayMember = "Title"
        ListBox1.ValueMember = "SoftwareID"

Open in new window


The data displays correctly in the list box, but...

Question: Why, upon click on the listbox, the following line doesn't display the value of SoftwareID?

It displays the column caption "SoftwareID" not the corresponding value of it.

    Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
        MessageBox.Show(ListBox1.ValueMember.ToString())
    End Sub

Open in new window

0
Comment
Question by:Mike Eghtebas
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 3

Accepted Solution

by:
Ali HND earned 350 total points
ID: 40521628
Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As EventArgs)
        If ListBox1.SelectedIndex <> -1 Then
            MessageBox.Show(ListBox1.SelectedValue.ToString())
        End If 
End Sub 

Open in new window

0
 
LVL 44

Assisted Solution

by:AndyAinscow
AndyAinscow earned 150 total points
ID: 40521689
>>Why, upon click on the listbox, the following line doesn't display the value of SoftwareID?
>>MessageBox.Show(ListBox1.ValueMember.ToString())

Simply said, it doesn't show the value of SoftwareID because you don't tell the message box to display that, you tell it to display something else namely the ValueMember of the Listbox which is the string "SoftwareID"
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40521696
Thanks Ali,

It fixed the problem. Is there any easier way without making a dt? Directly using WSCGSoftwareDataSet.Tables(0) or querying it? I will add a new question for it shortly.

Mike
0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 40521708
Just what Ali suggested.  (I just pointed out why your original code didn't work as you expected).
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 40521717
Thanks Andy. Your post made me realize the reason why. I hadn't paid any attention to it.

BTW, the link for my new question is: http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_28587819.html

Mike
0

Featured Post

[Webinar] How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question