public override Data.AdoTypeConverter Initialize(Data.IDataColumn user, Type clr, Data.IAdoTypeConverterRegistry registry, bool secondaryTable)
{
   //first we need to ensure that the clr type can be handled by this converter
   if (clr == typeof(int) && user.ResolvedSqlType == "varchar")
   {
       //then we need to set a flag to determine if the type is nullable
       nullable = typeof(int?) == clr;

       //finally return base.Initialize, which ultimatly returns "this"
       return base.Initialize(user, clr, registry, secondaryTable);
   }

   //if the converter can not work with the specified clr type we return null
   return null;
}