Custom error pages

Dear Developers,

 I have defined following code in the web.config:

 1 <customErrors defaultRedirect="http://lvs.pobos.nl/onderhoud.html" mode="On"&gt;
2 <error statusCode="500" redirect="http://lvs.pobos.nl/onderhoud.html" />
3 "404" redirect="http://lvs.pobos.nl/onderhoud.html" />
4 <error statusCode="403" redirect="http://lvs.pobos.nl/onderhoud.html" />
5

 

In my global file I have this:
1 // Code that runs when an unhandled error oc ...