this.dataGridView1.MultiSelect = false;
for (int i = 0; i < this.dataGridView1.Rows.Count; i++ )
{
     if ((long)this.dataGridView1.Rows[i].Cells["ID"].Value == lng_ID)
     {
          this.dataGridView1.Rows[i].Selected = true;
          this.datagridView1.BindingContex[this.datagridView1.DataSources,this.datagridView1.DataMember].Position = i;
          break;
     }
}