How to unbind and rebind listbox with data from access database in VB.NET?

Question

0.00/5 (No votes)

See more:

I can fill the listbox with data from database, but I cannot refresh the listbox items after unbinding and rebinding. When I rebind the listbox1, it adds or accumulate all items and it does not refresh, it was just adding.

What I have tried:

This is the in filling listbox

<pre>  provider = "Provider=Microsoft.Ace.Oledb.12.0;"
               dbtblats = "Data Source =ATSDatabase.accdb;"
        tblatsconnection.ConnectionString = provider & dbtblats
        tblatsconnection.Open()
        SqlQuery = "SELECT * FROM ATS"
        datblats = New OleDb.OleDbDataAdapter(SqlQuery, tblatsconnection) '
        datblats.Fill(dstblats, "ATS")
        tblatsconnection.Close()

        Me.ListBox1.DataSource = dstblats.Tables("ATS")
        Me.ListBox1.DisplayMember = "FullNameCN"

I tried this code to unbind and rebind data with new data:

<pre> Listbox1.DataSource = Nothing
        provider = "Provider=Microsoft.Ace.Oledb.12.0;"
               dbtblats = "Data Source =ATSDatabase.accdb;"
        tblatsconnection.ConnectionString = provider & dbtblats
        tblatsconnection.Open()
        SqlQuery = "SELECT * FROM ATS WHERE DateProcessed IS NULL ORDER BY DateReceived DESC"
        datblats = New OleDb.OleDbDataAdapter(SqlQuery, tblatsconnection) '
        datblats.Fill(dstblats, "ATS")
        tblatsconnection.Close()
               Me.ListBox1.DataSource = dstblats.Tables("ATS")
        Me.ListBox1.DisplayMember = "FullNameCN"

Posted 11-Dec-18 20:41pm

kyrons

Updated 11-Dec-18 22:31pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2018-12-11T22:32:00

Solution 1

The DataAdapter.Fill Method (System.Data.Common) | Microsoft Docs[^] adds the new rows to the existing set. You need to clear your adapter tables first.

Posted 11-Dec-18 22:32pm

Richard MacCutchan

Updated 12-Dec-18 0:17am

v2

Comments

kyrons 12-Dec-18 20:40pm

Thank you Sir Richard MacCutchan. I can fill data in listbox but I cannot clear the existing data. I used listbox1.datasource = nothing and listbox1.items.clear but I got an error "Items collection cannot be modified when the DataSource property is set." can you give me the solution or any suggestion to clear the existing items in listbox?

Richard MacCutchan 13-Dec-18 3:48am

You cannot use listbox1.items.clear on a bound control, since the items come from the binding. You need to remove the existing data from the source.