C# - how do I refresh DataGridView after removing rows

Question

Hello,

In my code I need to remove rows from the DataGridView after a recurring interval, and so I call the following function when a timer expires:

private void removeRows(DataGridView dgv) {

    foreach (DataGridViewRow row in dgv.Rows)
    {
        // if some condition holds
        dgv.Remove(row);                
    }
    dgv.Refresh();

}

I know the rows are successfully deleted from the DataGridView, though they still remains in the display for whatever reason. Any tips on what I might be doing wrong?

Answer 1

Don't you need to rebind the data grid?

dgrv.Datasource = [whatever data source];
dgrv.DataBind();

?

Answer 2

If it's a data-bound grid, you should be working on the binding source itself instead of the grid.

Answer 3

If you have bound your datagrid to an Observable Collection (if not then you should) then you will need to implement INotifyCollectionChanged interface so that listeners are notified of dynamic changes, such as when items get added and removed or the whole list is refreshed.

HTH

Answer 4

dgv does not contain any Remove method.. anyway are you sure this is not a bag somewhere else in the application? try to reproduce it in a new project.

Answer 5

Sometimes refreshing the data gridview is not enough and its containing parent should be refreshed too.

Try this:

dgv.Refresh(); // Make sure this comes first
dgv.Parent.Refresh(); // Make sure this comes second

You could also edit your source and attach the new datasource to the control.

Answer 6

Try removing the actual items from your binding source instead.