How to improve Cyclomatic Complexity?

Question

Cyclomatic Complexity will be high for methods with a high number of decision statements including if/while/for statements. So how do we improve on it?

I am handling a

Answer 1

The last if in case 2 can be simplified:

 if(isTrue)
 {
  if(e > 1)
  {

can be replaced by

if(isTrue && (e>1))

case 3 can be rewritten as:

new string[]{StringConstants.AAA,...}
    .Contains(e.PropertyName)

you can even make the string array into a HashSet to get O(1) performance.