dataGridView doesn't refresh the data when I move the vertical scrollbar

Hi everyone,

I have a problem on a datagridview.

The data of the datagridview are filled in real time through a separate thread. 

When I move the vertical scroolbar, down and after up, the data of the first row is overwritten. This makes the text incomprehensible.

I think that the system doesn't the refreh of the component.

Is there a way to do the refresh manually?

Thanks

Massimo