copy large object from base class using reflection

I have the following class hierachy:

public class DataDumpBase {
    public string propA {get; set;}
    public int propB {get; set;}
    public DateTime? propC {get; set;}
    //and so on up to 80 properties more
}

public class DataDumpLine : DataDumpBase {
    public List<decimal> Values {get; set; }
}

I need to create a new DataDumpLine and initialize it with the values from a DataDumpBase object.

I tried add this method in DataDumpBase

public DataDumpLine CreateLine() {
    DataDumpLine result = new DataDumpLine();
    foreach (PropertyInfo pi in this.GetType().GetProperties()) {
        pi.SetValue(result, pi.GetValue(this, null), null);
    }
    return result;
}

So I could do:

var line = dumpRows[i].CreateLine();

But the line pi.SetValue(result, pi.GetValue(this, null), null); throws a System.Reflection.TargetException exception: Object does not match target type.

The code is very similar to C# Using Reflection to copy base class properties

I don't figure out what is wrong