C#

public class A
{
Bitmap bitmap;

public Bitmap bitmap
{
get{ return bitmap; }
set{ bitmap = value; }
}

public void Fill(A ainst)
{
PropertyInfo[] pi = this.GetType().GetProperties();

            for (int a = 0; a < pi.Length; a++)
                pi[a].SetValue(this, pi[a].GetValue(source_SI, null), null);
}
   

}

public class B : A
{
A a_inst;

public B()
{
a_inst = new A();
}

public void Read()
{
bitmap = new Bitmap(); // any bitmap, it doesnt matter here
a_inst.Fill(this);
}
}

bitmap = new Bitmap(bitmap);