How do I add additional information to email message

I have a contact form that has the standard email fields such as name, email, street address, city, state, and body.  This is being done with System.Net.Mail.  I understand how to use the body, to/from address, and subject.  I don't understand how to include the street address, city, and state with the email though.  
I want this additional information to be sent with the email some how so the recipient can have access to it.  I assume this should be included with the body when the email is sent.  I don't understand the best way to so this though.  
I thought about appending the values of these fields to the body of the email.  I don't know how to format this so it looks good though.  The formatting I want to do is very basic.  I would like each of these values to be on a separate line before or after the body of the email.  I'm not interested in colors or anything too fancy.   I prefer to send a ...