I know that you can't have a constructor in an interface, but here is what I want to do:

```
 interface ISomething 
 {
       void FillWithDataRow(DataRow)
 }

 class FooClass<T> where T : ISomething , new()
 {
      void BarMethod(DataRow row)
      {
           T t = new T()
           t.FillWithDataRow(row);
      }
  }

```

I would really like to replace `ISomething`'s `FillWithDataRow` method with a constructor somehow.

That way, my member class could implement the interface and still be readonly (it can't with the `FillWithDataRow` method).

Does anyone have a pattern that will do what I want?