c# Performance snippet - checking if a string is null

Best practice for checking if the string is null is by (string.length == 0). It is more than 2 times faster than comparing to string.empty

c# Performance snippet - Using static string.equals

When comparing two strings it is recommended to it using the string.equals static function. The reason is that this function performs some short circuit checks before actually going to compare each character. For example if you are writing some generic code that will possibly get null as one of the strings the function will use this to perform more quickly. Also if you send the same two strings a reference matching will be found saving you the binary character comparison.

c# Performance snippet - Sending value types to function as REF

Something new I've found out is that if you have a function that you call many times and it has value parameters its worth considering sending these parameters as Ref. By doing so you'll send only the memory address and not generate a new value type.