Creating virtual directory through code showing an error as access denied

Hello
 
I am creating virtual directory from my C# code when i execute this code working every finely.
 
But problem is when i publish this code and access through iis it is showing an error as access denied  .
i tried to give permissions to the folder in c:\\inetpub\\wwwroot\foldername
 Network service and users  provided permissions of full control
But still showing an error of Access Denied(mine is iis 5.0 in xp)
Please help me out. What else permissions to be set for this please specify .
 
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