Specified cast is not valid on Assign Activity

the issue comes from 1 or more values present in the No_Documento column which are invalid for getting parsed/casted to a Double

e.g.*

  • Blank Values
  • strings in an invalid format like 1.000,25
  • letters…

In a first step we would recommend to inspect and to analyse non parseable values more in detail

Similar it was done here for datetimes:

we can do it with a stetement within the immediate panel

input_dt.AsEnumerable.Where(Function (x) Not Double.TryParse(x("No_Documento").ToString.Trim,nothing)).ToList