AutoCAD .NET :: Font And SHX File Validation

I have a rquirement to valdiate my dwg file with ObjectARX dll (accoreconsole dll) . I want to now if a font is not availble log the error. 

I  used
private static void FontValidator(Database db, Transaction tr)
{
TextStyleTable styleTable = tr.GetObject(db.TextStyleTableId, OpenMode.ForRead) as TextStyleTable;
foreach (var item in styleTable)
{
TextStyleTableRecord styleRecord = item.GetObject(OpenMode.ForRead) as TextStyleTableRecord;
[code]....

to go all StyleTableRecord but was not succesful to find my used font just there was 4 records..Am I doing the iteration in the right way ? How can I iteraret whole TextStyleTableRecord  in the DWG file?