Hello Rachid,
Could you please take a look at the following links:
http://help.infragistics.com/NetAdvantage/reporting/2011.2/CLR4.0/GettingStarted_Data_Sources_Overview.html?page=Walkthrough_Displaying_a_Report_in_Windows_Forms_Client_Side.html
and
http://blogs.infragistics.com/forums/t/54901.aspx.
Please do not hesitate to contact us if you need any additional assistance.