How to do update delete index using Code first approach and

Hi i have one view and it contain 22 fields. My DB is fully normalized. I have 13 tables to save those 22 fields. I used Code First approach and ViewModel for insertion . I did same as like which is mentioned in the below link for insertion process

http://www.codeproject.com/Tips/651495/Inserting-Data-into-Multiple-Tables-using-Code-Fir

Now insertion is working fine now i want to do UPDATE, DELETE, INDEX process using codefirstapproach and ViewModel in MVC4 i donno how to do this . For Index i write Inner Join query . But for Update and Delete Process? i donno how to retreive data from multiple able for update and delete process. Please any one give me solution with one example.

Advance Thanks.