DataGridView列长度大于30就以...形式显示

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if (e.ColumnIndex == 2 && e.RowIndex > 0)
{

if(e.Value!=null)
{
string values = e.Value.ToString();
if (values.Length > 30)
{
e.Value = values.Substring(0, 30) + "...";
}
}
}
}