compare tables from different database(using DropDownList to select database and CheckBoxList to select table)

Question

Hi friends,
I am new in asp.net(with C#)programming.
I have two DropDownList from which i can select database and
I have two CheckBoxList from which i can select table .

when i select any database from DropDownList1 then corresponding table names appear in CheckBoxList1.
similarly in DropDownList2....

PROBLEM is as follows.........
when i select table name from CheckBoxList1 and CheckBoxList2, then matching records from both selected tables (I can select multiple table also) should be displayed (using inner joine).

This query i executed in query analyzer, it is running successfully.
select DB1.dbo.Table1.Name, DB1.dbo.Table1.Phone from DB1.dbo.Table1 inner join DB2.dbo.Table2 on DB1.dbo.Table1.Phone=DB2.dbo.Table2.Phone

My job depend upon this solution...plz can u help me in asp.net(using C#)...
Thanks a lot...
Mujtaba