RDLC group totals to be displayed

Hi,

I have an RDLC report, In here I am showing ItemID, Quantity and Cost. There can multiple entries for ItemID where I need to group them by itemID and display item ID wise overall totals for Quantity and Cost.

Eg:

ItemID                             Qty                      Cost

1                                      10                          2

1                                        2                          2

Total                                 12                          4

2                                        2                          2

2                                        2                          2

Total                                   4                          4

How can I achieve this...In addition, I have date range to retrieve data. I get dates from two textboxes, txtFromDate, txtToDate. How can I display these textbox values(txtFromDate.text, txtToDate.Text) in the header part of the report. Please help me in this As I am a noob.

Regards,

Deepak