What is difference between String and string in C#

Same! like int is equal to System.int32

What is your favorite RDBMS

PostgreSQL is more popular than MySQL 
http://www.databasefriends.co/2014/03/favorite-relational-database.html

How solve problem: Get HTTP Error 401.1 - Unauthorized error with Windows Authentication and f5 host name binding only

#1: Need to add local machine host name into binding as well
#2: Disable loopback for IIS

References:
http://support2.microsoft.com/default.aspx?scid=kb;en-us;896861
http://stackoverflow.com/questions/5180851/iis-binding-with-windows-authentication
About loopback for Reflection attack
http://en.wikipedia.org/wiki/Reflection_attack