Map - Copy base class properties to derived class

ClassExtensions01.cs

public static TT Map<TT, ST>(this TT target, ST source) where TT : class
{
    var tprops = typeof(TT).GetProperties().Where(x => x.CanWrite).ToList();
    tprops.Where(x => x.CanWrite).ToList().ForEach(prop =>
    {
        var sp = source.GetType().GetProperty(prop.Name);
        var tp = target.GetType().GetProperty(prop.Name);
        if (sp != null && tp != null)
        {
            var value = sp.GetValue(source, null);
            target.GetType().GetProperty(prop.Name).SetValue(target, value, null);
        }
    });
    return target;
}

You can use it in the derived class constructor:

public DerivedClass(BaseClass b)
{
    if (b == null) return;
    this.Map(b);
}