Code Inspection: Private field can be converted to local variable
ReSharper helps you respect the principle of locality: if a field is only assigned and used in a local scope, ReSharper suggests converting the field to a local variable.
First, this transformation will normally reduce memory usage (however, this effect may be minimized by JIT optimization). Second, it will improve readability of your code.
Here is an example of a quick-fix suggested by this inspection: