One more update.

For image to work properly, you need to install libgdiplus.

In Centos 4.5 and above. Install it using yum

yum install libgdiplus.i386
yum install libgdiplus-devel.i386

Restart apache.

Thanks,
Presoon

Another issue I found is that, When the scripts are under a sub folder. (You will call the script via http://domainname/subfolder/test.aspx) the error may come up saying the assembly MySql is not found.

Here is the fix.
copy the MySql.dll file to your home.

Make a directory named bin under your public_html.
copy the MySql.dll file from /opt/mono/lib/mono/gac/MySql.Data/5.2.3.0__xxxxxxxxxx/MySql.Data.dll

into the bin directory just created. Now you can have the asp.net scripts inside your subfolders too.

Thanks,
Presoon