Lookup function issue or specific cell data binding problem

Question

I  have a dataset which has datatable having 2 columns i.e
Table( Id string,Value string)
Every single record in the datatable represents an answer to particular question, Id column being question identifier and Value column  being an answer and every question has answer being stored for 7 days.
Now i have designed a report which is in the form of grid like
                     Day1 Answer, Day2 Answer, Day3 Answer............................Day7 Answer
Question 1 
Question 2
.Question 40
I tried using lookup function in ssrs reporting service to bind every single cell in the report using data from dataset like
= Lookup("question_identifier",QuestionId.Value,AnswerValue.Value,"mydataset");
The report is working absolutely fine in the report designer as expected but when i take it to the ASP.NET website where i have to generate it, it never shows up and i get report couldn't be found and make sure you have published the report kind of errors.
I figured that this is the problem with lookup function because as soon as i removed all lookup function expressions in the report , the report started to show up but without data.
Please let me know if there is another way to go around this problem or fix this issue.
Thanks,
BR,

Answer 1

Hi Jolly,
I don't think we need lookup function for this. We have only one dataset, the report can be easily created by simply modifying the query of the dataset and place those fields in the tablix report. Refer below example,
create table reporttable(id int, value varchar(200))
insert into reporttable values(1,'abc')
insert into reporttable values(1,'abc1')
insert into reporttable values(1,'abc2')
insert into reporttable values(1,'abc3')
insert into reporttable values(1,'abc4')
insert into reporttable values(2,'abc')
insert into reporttable values(2,'abc1')
insert into reporttable values(2,'abc2')
insert into reporttable values(2,'abc3')
insert into reporttable values(2,'abc4')
insert into reporttable values(3,'abc')
insert into reporttable values(3,'abc1')
insert into reporttable values(3,'abc2')
insert into reporttable values(3,'abc3')
insert into reporttable values(3,'abc4')
select id as [Question],'Day ' + cast(row_number() over (partition by id order by id) as varchar) + ' Answer' as AnsCol
from reporttable
Regards, RSingh