or
cmbState.DataSource = stateTable;
cmbState.DisplayMember = "state_name";
cmbState.ValueMember = "state_code";
if (cmbState.FindItem(dr["OWNER_STATE_CODE"].ToString().Trim() ) != null)
{
index = cmbState.FindItem(dr["OWNER_STATE_CODE"].ToString().Trim() ).Index;
cmbState.SelectedIndex = index;
}