Web Service set amount of Concurrent Connections

add this to web.config file:

<system.net>
<connectionManagement>
      <addaddress="*"maxconnection="40"/>
</connectionManagement>
</system.net>

locked file, how to release file in use

To find out which application is using a file in Windows and to release/delete/remove/overwrite file do following:
use processexplorer and search the handles (Menu/Find/Find Handle (Crtls+F))for the file you want.
This way you can easily find which process is having a handle to your file.
Then do right click + 'Close Handle' to release locked file.

try catch python: error handling in python

simple error handling in python:

try:
.... your code here ....
except Exception, e:
        print "Error",i,e