file upload using form view

Question

i want to insert file and store it in the database and i have this error

""Compilation Error

Description:
An error occurred during the compilation of a resource required to service
this request. Please review the following specific error details and modify your
source code appropriately.

Compiler Error Message: BC30456:
'InsertButton_Click' is not a member of 'ASP.admin_aspx'."""

please answer me as soon as possiple