private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{
string pid = null;
if (e.RowIndex >= 0)
{
DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex];
pid = row.Cells["ID"].Value.ToString();
}
StuffInfo si = new StuffInfo(pid);
si.ShowDialog();
}