Then you don't know how to ask question dear because you should ask like that how to secure webpage using https encrption i.e. ssl certification with 128bit encryption . You know anything about hacking you have every crack any security have you uploaded any shells, rooted any server, done any type of hacking or something then based on what you can doing so see man in security your mind plays because i know security codding i make my own codding see suppose your website have something another venerability like DNN then there is no meaning for any encryption for that your website should be secured. For Encrption see one video tutorial http://www.screencast.com/users/Shivkoi/folders/Default/media/92f7f313-9b1f-47f9-b99e-b9e098263da3[^] May be help you.

Although Microsoft by default give you security like try one thing in Microsoft Visual Studio there exist venerability like XSS(Cross Site Scripting), Sql Injection, http request attack, Directory Listening etc but if you are using older version then you have to secure it by code tricks but in next version Microsoft have been solved this venerability so take regular updates to your visual studio you don't need to worry regarding your application, Although you wan't more security then you can use HTTPS that can be configure by WCF but for that you have to purchase ssl certificate it is mostly use by gmail pages. Now for that try one thing Create new web application Visual Studio > New > Website > C# web apllication > Take new Textbox and command button Now run this project and write "Alert("Hi");" Now click on Submit button It will give you an error like that XSS or CSS(Cross Site Scripting) so now you are secure. Not to worry regarding that just use latest things avoide to use old versions automatically secure.