How to remove selected items from ListBox when a DataSource is assigned to it in C#?

Question

How to remove selected items from ListBox when a datasource is assigned to it in C#?

When trying to remove, got error

"Items collection cannot be modified when the DataSource property is set."

---

But when i try to remove item from datasource (datatable) ,

it thorws error as "datarow is not in current row collection".

Answer 1

Find that item in the DataSource object and remove it, then re-bind the ListBox.

EDIT:

Here's how you delete from a DataTable as your DataSource, regardless of the .NET version.

DataRowView rowView = listBox.SelectedItem as DataRowView;

if (null == rowView)
{
    return;
}

dt.Rows.Remove(rowView.Row);

I haven't tried with anything other than WinForms DataGridViews, but I highly recommend BindingListView, which is both faster than DataTables/Views and allows you to bind generic List<T>s as your DataSource.

Answer 2

Alternatively, use a list that implements IBindingList or inherits from BindingList. When objects are added or removed from a Binding List, any controls bound to it are automatically notified of the change and will update themselves accordingly. If you are using BindingList and your class also implements INotifyProperty changed, Any changes to class properties will also be updated automatically in the databinding control. For example, if a column in a datagrid(view) is bound to a property, "Name", and you change "Name" in the datasource, the datagrid will automatically update. If you add a new item to the datasource, the datagrid will update automatically. Binding List also supports notification in the other direction. If a user edits the "Name" field ina datagrid, the bound object will be updated automatically. Going off topic slightly, if you go a little further and impliment "SupportsSortingCore" and the associated methods in BindingList, you can add automatic sorting to your data. Clicking on a columnm header will automatically sort the list and display the header sort direction arrow.