instantiating many to many relationship table in entity framework

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MVC4

Dears,

I have 3 tables named as Users, Groups, UserInGroups.

User table has Id(guid),Username, fullname

Groups table has Id(guid),Groupno, groupname

and a reference table called useringroups, it just have two fields UserId,GroupId

How can i insert to useringroups table using entity framework in asp.net mvc4. Kindly help me

regards