about list box control

public void BindData(int fid)
       {
           dt = new DataTable();
           dt = _familyHist.GetFamilyHistory(2, fid);
           if (dt.Rows.Count > 0)
           {
               lstMedicalCondition1.DataSource = dt;
               lstMedicalCondition1.DisplayMember = dt.Columns[2].ColumnName;
               lstMedicalCondition1.ValueMember = dt.Columns[1].ColumnName;
           }
           rtbAdditionalInfo1.Text = dt.Rows[0]["AdditionalInfo"].ToString();
       }