Hi,

as per your discription u 'r requirement is like when ever Row data changed column name also has to be changed. IF my understanding is correct u have to create one more Row detail row at the end of table of your Report and write below Expression

=Fields(ReportItems!Textbox1.Value).Value in header part.

OR

in your Query you have to insert every column name as a First value in data set.

take that First values in Header using below expression:--

First(Field.value,"dataset")

please Let me know if anything!!

Regards,

Akhil