A webform by default posts back to itself. An Asp.net page can be made to post back to another page by using the PostBackUrl attribute of the ASP.Net button control.
asp.net
Accessing values from config files
Performace optimized code for accessing values from resource file and config files.
Uploading huge files
The maximum upload size through ASP.Net by upload controls is 4096KB (4MB). If the file size exceeds, the upload fails and results in “Request Timed Out”