IsNullOrEmpty
This extension increase the readability of your code.
Source
public static bool IsNullOrEmpty(this String source){
return String.IsNullOrEmpty(source);
}
Example
var myReallyNiceString = GetThisStringFromACoolMethod();
if(myReallyNiceString.IsNullOrEmpty()){
DoSomeThingFancyStuff();
}