If I set myDataGrid.DataSource=myDataSet; in the click event of a button, everything works great. If I run the exact same line of code in an event handler method, the program becomes unstable, hangs or crashes. I get the same effect if I set myDataGrid.DataSource=null;

The event handler handles an event raised by inserting a smart card. If I put a MessageBox.Show("It Works") line in the event handler (or anything else for that matter), it seems to work fine. It's only in trying to set the DataSource of a grid that I see this behavior. Any ideas?

I'm using the mmDataGrid control and a dataset returned from a biz object .GetCurrentDataSet() call (or simply null).

Thanks in advance
Mike