Passing textbox text in form to RDLC header

Good days to all,

I'm using vb.net. In aspx form, i got 2 textbox (start date and end date) and 1 reportviewer.

I'm binding dynamic dataset to rdlc where i directly takes the start date and end date text in my SQL query without using the parameters.

Now i would like to show the start date and end date value in RDLC header.

It is highly appreciated if any of you can give some idea, how to display start date and end date value in RDLC header.

Thank you very much.