Trying to Bind List<T> to CheckedListBox in WinForms c#

Question

I am using WinForms C# Is there any way to get following behavior:

1. bind List to CheckedListBox
2. When I add elements to list CheckedList box refereshes
3. When I change CheckedListBox the list changes

I tried to do the following:

Constructor code:

checkedlistBox1.DataSource = a;
checkedlistBox1.DisplayMember = "Name";
checkedlistBox1.ValueMember = "Name";

Field:

List<Binder> a = new List<Binder> { new Binder { Name = "A" } };

On button1 click:

private void butto1_Click(object sender, EventArgs e)
{
    a.Add(new Binder{Name = "B"});
    checkedListBox1.Invalidate();
    checkedListBox1.Update();
}

But the view does not update .

Thank You.

Answer 1

Change this line:

List<Binder> a = new List<Binder> { new Binder { Name = "A" } };

to this:

BindingList<Binder> a = new BindingList<Binder> { new Binder { Name = "A" } };

It will just work without any other changes.

The key is that BindingList<T> implements IBindingList, which will notify the control when the list changes. This allows the CheckedListBox control to update its state. This is two-way data binding.

Also, you could change these two lines:

checkedListBox1.Invalidate();
checkedListBox1.Update();

to this (more readable and essentially does the same thing):

checkedListBox1.Refresh();