Hi @shivappa.katti1 ,
Welcome to UiPath Forum.
You can write a simple expression as mentioned below in assign activity and store it into an array of strings:
Directory.GetFiles(“FolderPath”).Where(function(f) f.EndsWith(“.xls”) OrElse f.EndsWith(“.pdf”) OrElse f.EndsWith(“.txt”)).ToArray
Next, you can loop through this array using foreach loop to read the intended files.
Please let us know if it answers your query.
Thanks,
Anjani