How can we delete and update a row in gridview having value of two tables?

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ASP.NET

Gridview

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I want to delete and update a row in Gridview but that grid have values of two tables

I'm using following sttement for selecting-
SELECT JobMaster.Country, JobMaster.City, JobMaster.State, JobMaster.EmploymentType, JobMaster.JobTitle, JobMaster.SpecializedArea, JobMaster.Specializedskill, JobMaster.ID, JobMaster.[Post Assign], RAssign.RecruiterID AS Post_Assign FROM JobMaster LEFT OUTER JOIN RAssign ON JobMaster.ID = RAssign.JobID WHERE (RAssign.RecruiterID = @RecruiterID) OR (@RecruiterID IS NULL)

What statement should I use for Update,Insert and for delete?
(Actually I'm new in coding and I just know to delete from single table but in above statement we are selecting to tables data one is "Jobmaster" and second is "RAssign".
Please help me if possible)