Crystal Report Filteration

Hii Friends,

            I am having a Web Application in c# Asp.net.

            I am having a 3 Cryatal Reports on my Project obtained from Xml datasource withs some xml data in it..

            My Requirement is that i want to filter those Crystal Reports Data from the web form where the crystal Report is placed.

            The filteration shall take place from the dropdown on the web form, and then fromDisplayReport Button the filtered reports shall be displayed in thecrystal reportviewer.

   Thanks and Regards

      Sushant2014