CODE EXAMPLE FOR CSHARP

delete selected cells in Datagridview

private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Delete)
    {
        foreach (DataGridViewCell cell in dataGridView1.SelectedCells)
        {
            cell.Value = "";
        }
        e.Handled = true;
    }
}