Upload file size

Hi,
When we set MaxRequestLength as 20mb. When i try to uploag 21 mb file its raise error page. 
If i use FileUpload1.PostedFile.ContentLength to check file size , it size is >20MB its raise error page. How can i stop it


i have gone through this post but its not working
http://www.developer.com/db/article.php/10920_3426051_2/Limiting-Upload-Sizes-with-ASPNET.htm


krds
lakmal




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