Is it possible to remove an item from a listbox populated with a database?

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Before i ask "How to remove an item from a listbox populated with a database"

Is it possible to remove an item from a listbox populated with a database?

What I have tried:

if it is possible, my code is not working:

VB

Dim str As String
            Dim drv As DataRowView = CType(ListBox1.SelectedItem, DataRowView)
            str = CStr(drv.Row.Item("PName"))
            ListBox1.Items.Remove(ListBox1.SelectedItem(str))

This is how i populate my listbox:

VB

'Populate the ListBox with personnelName from personnel '
       Try
           connection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Nikko Jaze Fabellon\Documents\ASRASIM.accdb")
           connection.Open()
           ds = New DataSet
           tables = ds.Tables
           dataAdapter = New OleDbDataAdapter("SELECT [FirstName],[LastName] from [Personnel] where [Status] = 'Activated' ", connection)
           dataAdapter.Fill(ds, "Personnel")
           Dim view1 As New DataView(tables(0))
           With personnelList
               .DataSource = ds.Tables("Personnel")
               .DisplayMember = "FirstName"
               .ValueMember = "LastName"
               .SelectedIndex = 0
           End With

           connection.Close()

       Catch ex As Exception
           MessageBox.Show(ex.Message)
       End Try

or if it is not possible, i need advice to think of another way.

Posted 12-Feb-18 23:55pm

WinterPrison

Updated 14-Feb-18 7:53am

v2

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phil.o 13-Feb-18 5:59am

If the combo box is data bound, then no, you cannot remove an item this way. You have to filter the datasource instead so that it does not return the element you do not want to see.
Filtering a datasource is usually made through the WHERE statement.

WinterPrison 14-Feb-18 8:54am

i updated my codes, can u help me sir?

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Maciej Los · Answer 1 · 2018-02-14T07:53:00

WinterPrison[^] wrote:
Before i ask "How to remove an item from a listbox populated with a database"

Is it possible to remove an item from a listbox populated with a database?

Untill a ListBox control is not bind with a datasource, you can easily remove item from that control. Your ListBox object is not bind with data source, so... See:
ListBox.ObjectCollection.Remove Method (Object) (System.Windows.Forms)[^]
How to: Add and Remove Items from a Windows Forms ComboBox, ListBox, or CheckedListBox Control | Microsoft Docs[^]
In the other way, you have to update datasource instead of removing ListBox item. See:
How to: Reflect Data Source Updates in a Windows Forms Control with the BindingSource | Microsoft Docs[^]
Updating and Rebinding Data Source References[^]
How to: Update a Data Source with Data from a Host Control[^]

Good luck!

RickZeeland · Answer 2 · 2018-02-13T01:48:00

You could use a DataTable like this:

using (SqlConnection conn = new SqlConnection(CONN_STR))
using (SqlDataAdapter da = new sqlDataAdapter("roboticSiteNames", conn)) {
DataSet ds = new DataSet();
da.Fill(ds);
DataTable dt = ds.Tables[0];

// 1. set DisplayMember and ValueMember
lbSiteCode.DisplayMember = dt.Columns[0].ColumnName;
lbSiteCode.ValueMember = dt.Columns[1].ColumnName;
// 2. set DataSource
lbSiteCode.DataSource = dt;
}

This is from an answer here: Datatable to listbox[^]

Then you can delete rows in the DataTable, see How to: Delete Rows in a DataTable[^]

This can also be done in a DataSet, e.g.

NorthwindDataSet1.Customers.Rows(0).Delete()

RickZeeland · Answer 3 · 2018-02-14T03:07:00

Solution 2

As you are using a DataView now, you can use .RowFilter like this:

dv.RowFilter = "FirstName < 'Peter'";

See: DataView.RowFilter Property (System.Data)[^]
Here is a nice overview: DataView RowFilter Syntax [C#][^]

Posted 14-Feb-18 3:07am

RickZeeland

Updated 14-Feb-18 3:10am

v2

Comments

Maciej Los 14-Feb-18 13:56pm

And this one too...
;(

Is it possible to remove an item from a listbox populated with a database?

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