我想通过我的ASP.NET项目发送电子邮件

I have created web form, and now I want this data to be stored in the database and form be emailed to the email. This is not working, because it consistently tells me that there is a Server error in '/' Application. Even though I redirect to Thankyou page, and also I have included code for Thank you page. Please tell me what I am doing wrong.I have created web form, and now I want this da