Check out example codes for "isInstanceOf nunit". It will help you in understanding the concepts better.

Code Example 1

Assert.IsInstanceOf(Type expected, object actual);
Assert.IsInstanceOf(Type expected, object actual,
                    string message, params object[] parms);
Assert.IsInstanceOf<T>(object actual);
Assert.IsInstanceOf<T>(object actual,
                       string message, params object[] parms);

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