private static void DeleteFirstWorksheet(SpreadsheetLight.SLDocument document)
{
Debug.Assert(document != null);
// If we have just one worksheet then test was empty (!) or something went wrong,
// just do nothing and let caller manage an erroneous situation (if any)
var worksheets = document.GetWorksheetNames();
if (worksheets.Count > 1)
{
document.DeleteWorksheet(worksheets[0]);
}
}