listbox Refresh() in c#

Question

int[] arr = int[100];
listBox1.DataSource = arr;
void ComboBox1SelectedIndexChanged(object sender, EventArgs e)
{
    .....//some processes
    listBox1.DataSource =         


        

Answer 1

The problem might come from the ListBox SelectionMode.

For a reason that I don't know, the databinding does not work when SelectionMode is SelectionMode.None.

A workaround could be:

listBox.SelectionMode = SelectionMode.MultiExtended;
listBox.DataSource = myDatasource;
listBox.SelectionMode = SelectionMode.None;

Hope it helps.

Answer 2

try the following

listBox1.DataBind()

Answer 3

Use BeginUpdate and EndUpdate, that should solve it. No need to set the data source twice

listBox1.BeginUpdate();

listBox1.DataSource = myList;

listBox1.EndUpdate();

Answer 4

my first answer on stack exchange here.

C# .Net 4.0:

listBox1.DataSource = null;
listBox1.DataSource = names;

I noticed that setting the datasource for the first time, it refreshes. When it's set, and you try set it to the same one again, it doesn't update.

So I made it null, set it to the same one, and it displayed correctly for me with this issue.