How to enable the gridview to display data of a specific user only

1. Create a New label1 to store the username. This is the key to the success of this method, because I failed to use SESSION ("username.
Use Control to pass variables. Success!
2. "gridview tasks" -- "configure data source" -- all the way down next --- go to the "define custom statements or stored procedures" window. SQL selete statement
Select courseid, description, [content], contenttype, contentsize, sendor, filename, filetime from course
Change
Select courseid, description, [content], contenttype, contentsize, sendor, filename, filetime from course where (sendor = @ username)
2. Click next to the following window and set

Finally, my usernames are obtained using the membership function.