If you call GetType() on a Type variable, the return value will always be typeof(System.Type). So there’s no real point in making that call. The same applies to passing a type argument to IsInstanceOfType. In both cases the results are entirely predictable.

Noncompliant Code Example

var intType = typeof(int);
var runtimeType = intType.GetType(); // Noncompliant, always typeof(System.RuntimeType)

var s = "abc";
if (s.GetType().IsInstanceOfType(typeof(string))) // Noncompliant; false
{ /* ... */ }

Compliant Solution

var s = "abc";

if (s.GetType().IsInstanceOfType("string"))
{ /* ... */ }

Exceptions

typeof(Type).GetType(); // Can be used by convention to get an instance of ‘System.RuntimeType’