oDB.DB2conn();
        
        // ComboBoxen "Anrede" füllen
        DataSet oDSAnr = oDB.cmbBx_Load("SELECT * FROM ANREDE", "ANREDE");
        hanrede_cmbBx.DataSource = oDSAnr.Tables["ANREDE"];
        hanrede_cmbBx.DisplayMember = "ANR_BEZEICHNUNG";
        hanrede_cmbBx.ValueMember = "ANR_CODE";
        hanrede_cmbBx.DataSource = oDSAnr.Tables["ANREDE"];
        vanrede_cmbBx.DisplayMember = "ANR_BEZEICHNUNG";
        vanrede_cmbBx.ValueMember = "ANR_CODE";

        // ComboBox "Wunschcode" füllen
        DataSet oDSWun = oDB.cmbBx_Load("SELECT * FROM WUNSCHCODE", "WUNSCHCODE");
        hwun_cmbBx.DataSource = oDSWun.Tables["WUNSCHCODE"];
        hwun_cmbBx.DisplayMember = "WC_BEZEICHNUNG";
        hwun_cmbBx.ValueMember = "WC_CODE";

        public DataSet cmbBx_Load(string cmd, string table)
        {
          oDS.Clear();
          oDB2Conn.Close();
          oDB2Conn.Open();
          oDB2DaAdap = new DB2DataAdapter(cmd, oDB2Conn.ConnectionString);
          oDS = new DataSet();
          oDB2DaAdap.FillSchema(oDS, SchemaType.Source, table);
          oDB2DaAdap.Fill(oDS, table);
          return oDS;
        }

        public DataSet cmbBx_Load(string cmd, string table)
        {
          oDS.Clear();
          oDB2Conn.Close();
          oDB2Conn.Open();
          oDB2DaAdap = new DB2DataAdapter(cmd, oDB2Conn.ConnectionString);
          oDS = new DataSet();
          oDB2DaAdap.FillSchema(oDS, SchemaType.Source, table);
          oDB2DaAdap.Fill(oDS, table);
          return oDS;
        }

        public DataSet cmbBx_Load(string cmd, string table)
        {
          DataSet dataSet = new DataSet();
          DB2DataAdapter adapter = new DB2DataAdapter(cmd, oDB2Conn.ConnectionString);

          // die beiden zeilen sind überflüssig, da du oben den ConnectionString benutzt und nich die COnnection selbst
          //oDB2Conn.Close();
          //oDB2Conn.Open();

          adapter.FillSchema(dataSet , SchemaType.Source, table);
          adapter.Fill(dataSet , table);
          return dataSet ;
        }