vb.net - How can I manipulate the INNER JOIN between two tables using sql command in Visual basic 2010 my database is access -

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i have 2 tables 1 product , 1 invoice . want select product using combo box instead of using product code. want select products name . how use insert to, update, , select ? :) . beginner . 

select * invoice inner join products           on  invoice.productcode=products.productcode

product table= productcode, productname, category,model,price, notes
invoice table=invoiceno,productcode,quantity,subtotal,discount,cash,quantity,total.


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