Send email when with UserName and Password when users forget password

hi 

according to this thread

http://www.aspforums.net/Threads/194350/send-email-when-users-forget-their-password/

I learn how we can sending formatted email

now in my Login.aspx page i have Textbox that when users forget their password they should type their Username on the textbox and after that click on send button.

I want when users click on send button their user name that they type in textbox be on the email that send to me .

how i can do it?

thanks