System.Data.SqlClient.SqlBuffer.SetToNullOfType C# (CSharp) Method

        internal void SetToNullOfType(StorageType storageType)
        {
            Debug.Assert(IsEmpty, "setting value a second time?");
            _type = storageType;
            _isNull = true;
            _object = null;
        }

 private static void GetNullOutputParameterSmi(SmiMetaData metaData, SqlBuffer targetBuffer, ref object result) {
     if (SqlDbType.Udt == metaData.SqlDbType) {
         result = NullUdtInstance(metaData);
     }
     else {
         SqlBuffer.StorageType stype = SqlDbTypeToStorageType(metaData.SqlDbType);
         if ( SqlBuffer.StorageType.Empty == stype ) {
             result = DBNull.Value;
         }
         else if (SqlBuffer.StorageType.SqlBinary == stype) {
             // special case SqlBinary, 'cause tds parser never sets SqlBuffer to null, just to empty!
             targetBuffer.SqlBinary = SqlBinary.Null;
         }
         else if (SqlBuffer.StorageType.SqlGuid == stype) {
             targetBuffer.SqlGuid = SqlGuid.Null;
         }
         else {
             targetBuffer.SetToNullOfType( stype );
         }
     }
 }