Object reference not set to an instance of an object for drop down list were datasource is a datatable

Hi has anyone else come across a similar issue as described below
I have a web form with several DDL and text boxes some of them have post backs some dont
the DDLs have 3 or 4 Values like Yes , No or Often, Regularly, Never 
a user is able to select the values and save his selection results on a sql server and a record number is generated on the save.
he is also able to retrieve his results via the same record number Via a subroutine called RecordSrchId all the text boxes get populated most of the DDLs get populated and results are selected but some of the DDLs dont get selected.
The DDLs for example will have Yes, No results as values in the list of items. The retrieved data from the sql is presented in a datatable and the value is cascaded down via the correct ID of the items for example "mydatatable.Tables(0).Rows(0)(2).ToString" where my datatable is the datatable and (2) is the item number i get ...