loadDatasetFromEpicorBAQ.cs

// Load dataset via custom BAQ
using (var session = new Epicor.Mfg.Core.Session("user", "secret", "AppServerDC://server:port"))
{
    // DynamnicQuery for BAQ
    var dynamicQuery = new Epicor.Mfg.BO.DynamicQuery(session.ConnectionPool);

    // Get named BAQ
    var queryDesignDataSet = dynamicQuery.GetByID("01-BAQName");

    // Execute and store
    DataSet ds = dynamicQuery.Execute(queryDesignDataSet);
    ds.WriteXml(cacheFile);
}