Problem with DataGridView

Hi, I am learning visul studio .net and I am developing a database application with VB .net 2005. I 've 3 tables namely members(id,salry_no,name,address,date_of_appointment), Loan(reg_no,salary_no,amount,) and Guarantor(reg_no,salary_no). I want to create a form which displays all the fields from loan and salary_no,name and date_of_appointment in a grid in which salary_no will be from guarantor and name and date_of_appointment from member table. If a member takes loan he must provide the name of the gurantors which will be existing members. the no of guarantors depends on the loan amount taken, so there will be many guarantors in the Guarantors table corresponding to a perticular reg_no in Loan table. I am able to display the records by joining the tables and so on but I am having problem with inserting, updating and deleting records.

Please help.

Regards,

SHISHIR