Generate sequence number in textbox using vb.net

Question

I am working on student application form in vb.net. I designed a form with fields like firstname,Middlename,Lastname,age,sex,DOB,Education.Height and Weight. Back end as SQL Server 2005. I just want to generate sequence numbers in textbox using vb.net. While loading the form,i should generate number as '1' and second time,if the form gets loading it shows '2' and goes on... Please Help me...