How to write filter based on dropdownlist box and bind to webgrid in mvc3

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SQL-Server-2005

C#

SQL-Server

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My select command is

select c.Name,c.CharityNumber,c.stateid from pledgenet.charity c inner join PledgeNet.CharityFederation cf  on c.charityid=cf.charityid where cf.federationid=2 order by federationid

i have 3 tables
1 is charity and
2 is charityfederation
3 is Federation
CharityTable contain charityid and its related fileds but does not contain federationId

2 nd Federation its contain CharityId and federationID both are foreign keys

3rd is federation contains federationid and its related data
so want to bind federation name to dropdownlist Box for filtering purpose.

the final out put is
CharityId CharityName CharityLocation these are displayed in webgrid
how to do this in mvc3 razor please help me.