Sending bulk email with unsuscribe link

Thank you Sanjay Kumar for your feedback. I tried both links but none of the methods described in these posts seem to be adaptable to the approach used in the above tutorial. Probably the reason why I find this kind of hard to achieve is because I am quite new to asp.net and I am in a learning phase. In particular, you said that this is easy task to achieve by only keeping the users email id's in Database.
So the questions are:
•I am keeping the USER ID in database in the same table where I also keep the users' emails. Would this work?
•Looking at the very nice tutorial at http://www.c-sharpcorner.com/UploadFile/47548d/how-to-send-bulk-email-using-Asp-Net/ , how can we enhance this code so that we can add in the email template an unsubscribe code returning a query string containing the user id (or email ID if you prefer) and that allows the subscribers to opt out from the newsletter?
Thank you so much in advance for reading and if you can answer with some additional code.

Hi...  kurt Brewster only maintaining the users email id's in Database "unsubscribe"

try this link

http://stackoverflow.com/questions/19854502/unsubscribe-option-in-email-using-c-sharp 
http://www.dotnetspark.com/kb/337-subscribe-and-unsubscribe-asp-net.aspx