Hello,
Whichever field user wants to enter data you have to design in a view. You have to take email connection for to send the data as email. Bottom of the form you have keep one button and it has code as below to send the data as email body,
EmailSubmitConnection emailSubmit = (EmailSubmitConnection)this.DataConnections["Email Submit"];
emailSubmit.Introduction = "You have to add the fields data here";
this.Submit();
Clicking on email button it will send the above data in body of the mail.