crystal repor and aspx problem

Question

i made a crystal report and using two parameter OrderNo,and CustName i want to display parameters on my aspx1 page ,aspx1 page

have two dropdown one for orderno and other for CustName and one button when user select the these two value from dropdown 

and click the button then its value pass to aspx2crystal report page for filtering .....please give me an example

please help me