Adding-DataSet.md

var wb = new XLWorkbook();

var dataSet = GetDataSet();

// Add all DataTables in the DataSet as a worksheets
wb.Worksheets.Add(dataSet);

wb.SaveAs("AddingDataSet.xlsx");

private DataSet GetDataSet()
{
  var ds = new DataSet();
  ds.Tables.Add(GetTable("Patients"));
  ds.Tables.Add(GetTable("Employees"));
  ds.Tables.Add(GetTable("Information"));
  return ds;
}

private DataTable GetTable(String tableName)
{
  DataTable table = new DataTable();
  table.TableName = tableName;
  table.Columns.Add("Dosage", typeof(int));
  table.Columns.Add("Drug", typeof(string));
  table.Columns.Add("Patient", typeof(string));
  table.Columns.Add("Date", typeof(DateTime));

  table.Rows.Add(25, "Indocin", "David", DateTime.Now);
  table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
  table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
  table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
  table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
  return table;
}