public sealed class Subtype : ArcGIS.Core.CoreObjectsBase, System.IDisposable  

{
  // Must be called within QueuedTask.Run
  string GetDomainStringFromField(Row row, Field field)
  {
    // Get the table and table definition from the Row
    using (Table table = row.GetTable())
    using (TableDefinition tableDefinition = table.GetDefinition())
    {
      // Get name of subtype field
      string subtypeFieldName = tableDefinition.GetSubtypeField();

      // Get subtype, if any
      Subtype subtype = null;

      if (subtypeFieldName.Length != 0)
      {
        // Get value of subtype field for this row
        object varSubtypeCode = row[subtypeFieldName];
        long subtypeCode = (long)varSubtypeCode;

        // Get subtype for this row
        subtype = tableDefinition.GetSubtypes().First(x => x.GetCode() == subtypeCode);
      }

      // Get the coded value domain for this field
      CodedValueDomain domain = field.GetDomain(subtype) as CodedValueDomain;

      // Return the text string for this field
      if (domain != null)
      {
        return domain.GetName(row[field.Name]);
      }

      return row[field.Name].ToString();
    }
  }
}