get the value from textbox,,to execut query

Question

hi,,,this my query as given below

select b.RegNo,

     b.FirmName, 

       isnull(a.BalTaxAmount,0) + isnull(a.BalPenalty,0) + isnull(a.BalNoticeFee,0) DueAmount,

       isnull(a.BalInterest,0) InterestAmt,

  datediff (day,  DueDate ,getdate()) duedays,

       b.autoid IDtblPTForm3

from tblPTForm3Balance a, tblPTForm3 b

where a.IDtblPTForm3 = b.AutoID

 and a.LocationID = <LOcationID>

 and a.YearID = <YearID>

 and (isnull(a.BalTaxAmount,0) + isnull(a.BalPenalty,0) + isnull(a.BalInterest,0) + isnull(a.BalNoticeFee,0)) > 0

 and convert(datetime,convert(varchar(10),a.DueDate + <days>,101))  <= convert(datetime,convert(varchar(10),getdate(),101))

i want to get the values of <days> from textbox and <location ID> and <yearId> from dropdownlist.

to execute this query and bind data in a grid..how can i do this.

please provide me code by example..

thank you