why doesn't datagridview refresh?

Question

here is what happens after i press a button:

    dataGridView1.DataSource = ConnectandReadList(some_query);
    dataGridView1.Refresh();

pl

Answer 1

Little trick you can do if you are binding to a List<> when setting it to your data source add ToList() on it at the end like this:

dataGridView1.DataSource = ConnectandReadList(some_query).ToList();

For some reason this causes it to refresh without loosing any references or anything.

An alternative is to directly notify the DataGridView that its data changed like this:

dataGridView1.DataSource = ConnectandReadList(some_query)
var m = dataGridView1.GetType().GetMethod("OnDataSourceChanged", BindingFlags.NonPublic | BindingFlags.Instance);
m.Invoke(dataGridView1, new object[] { EventArgs.Empty });