Use Server Side Script In Sharepoint 2010

When we user Server Side Script in share-point that time add the "PageParserPaths" in Web.config.

<PageParserPaths>
       <PageParserPath VirtualPath="/SitePages/*" CompilationMode="Always" AllowServerSideScript="true" />
     </PageParserPaths>

Now there are some additional properties you can assign:

Like CompilationMode, AlowServerSideScript andIncludeSubFolders and I guess the two latter parts are self explanatory but for CompilationMode, you have the following options:

Always: The default value, which compiles the page always.
Auto: Page will not be compiled if possible.
Never: The page will not be dynamically compiled.