I am using a calculation in my SQL query. How can I use that calculated field in C#? When I try, I get an index out of range exception.

My query is:

Select OwnerCompanyLog.olog_name,inlt_companyid,inlt_childcompid,inlt_effectinterest,inlt_percent,inlt_sharetype,inlt_shares,inlt_childbase,inlt_effdate,
(inlt_percent * inlt_effectinterest)/100)eff
from InterestLogTable 
INNER JOIN OwnerCompanyLog 
ON 
InterestLogTable.inlt_childcompid = OwnerCompanyLog.olog_companyid 
where inlt_companyid=5 
Order By inlt_childcompid 

I want to use inlt_percent * inlt_effectinterest)/100 in my C# code:

 entity.ParentCompany = new List<Company>();
     while (parentCompanyReader.Read())
            {
    ParentCompany.Effect = parentCompanyReader["eff"].ToString();
    entity.ParentCompany.Add(ParentCompany);
            }

            parentCompanyReader.Close();

But I got the error above.