using System;

using System.Reflection;

​

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo();

        BindingFlags bindFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static;

        FieldInfo fieldInfo = foo.GetType().GetField("field", bindFlags);

        Object fieldValue = fieldInfo.GetValue(foo);

    }

}

​

public class Foo

{

    public Foo()

    {

        field = 1;

    }

​

    protected int field;

}