Access :: Retieving Records From Database - To Retrieve 11 Columns, 7 Of Them Are Empty ?

-7vf- I write a program by c# to check and retrieve data from database

The problrm:I have one table(1), I want to make update for that table(1) that is by compare the one column in table(2) with the right side from one column in table(1), so if there is any similarity it will retrieve the data and if there is no match just it will make the record empty(null) "the data type of retrieving columns: number 'double'", but the problems is:

I try to retrieve 11 columns, 7 of them are empty .the program run with out error ,but it will retrieve some records with full data 11 columns, but some of records has only 5 columns have data and 7 columns are empty (these records when I run the program did not retrive any columns, it give me empty records!!)

this is the code :
while (or.Read())
{ or.GetValues(field); OdbcCommand oc2=null;
[code]....

I want to retrive all data which are empty or null and all data