cnn = new OdbcConnection();
    cnn.ConnectionString = Properties.Settings.Default.cnnString; //cnnString="DSN=...;PWD=...;UID=..."
    ds = new DataSet();
    da = new OdbcDataAdapter(SelectText, cnn);
    try
        {
             da.Fill(ds, "FoundDoc");
             ..............................
        }
    ....................................
    string UpdateText = "";

    UpdateText += "UPDATE payordemployee SET";
    UpdateText += AddSet; // строка вида "fieldname1 = value1, ..., fieldnameN = valueN
                                     // valueN - значения св-ва Text текстовых полей
    UpdateText += " WHERE idemployee = " + ds.Tables["FoundDoc"].Rows[0].ItemArray[0].ToString().Trim() + ";";

    OdbcCommand cmd = cnn.CreateCommand();
    cmd.CommandText = UpdateText;
                    
    try
        {
             cnn.Open();

             try
                 {
                      cmd.ExecuteNonQuery();
    ................................