EdVinyard

using System.Reflection;
using NUnit.Framework;

public static class MethodInfoExtensions
{
    public static bool IsOverride(this MethodInfo m)
    {
        return m.GetBaseDefinition().DeclaringType != m.DeclaringType;
    }
}

EdVinyard

using System.Reflection;
using NUnit.Framework;

public class IsOverrideTests
{
    abstract class Base
    {
        public virtual void Overridden() { }
        public virtual void Inherited() { }
    }