problem in mail format

Question

Hello everyone. i m posting the same porblem again cause i didnt get any good responce please help me
i need your help. (Amit and kirtan please check this out)
i designed  a form for add user and after submit the all required information that form mail some data to the user account which use give in email section.
like First/last Name. Security Question and Security Answer.
i dont want html mail sending i need in aspx.cs page
my code doing it but the problem is that i cannot set the body of this mail. all details mail in single line but i want it going in proper manner. like this....
First Name
Last Name
Security Question
Security Answer
 or

FirstName	Abcd
Last Name	XYZ
Security Question	Question
Security Answer	Answer

can anyone tell me how to do this
i attached my page along with this post
i used mater page in my project so please set this form in normal aspx page
Thanks Alot