What is the package for splitting a data set by comma

I am trying to split data by comma …here is what I haveimage

we assume that a column value needs to split.Currently is is splitting the value.System.Data.DataTable / Tablename returned from dt.toString

The validation issue could come from dt1 datatype is not a string array

give a try on
assign activity
Left side: arrSplit | DataType String()
rightside: row(YourColNameOrIndex).toString.Split(","c)