While designing a workflow we have a use case in which we want to search for a document using barcode in the repository and update the metadata value of the document.

We are using workflow SDK Script to achieve this. We have found a method that searches the documents but doesn't seem to work.

protected override void Execute()

        {

            using (Search search = new Search(session)){

               search.Command = "";

                search.Run();

                 //Get Search Results here

}}

from where i will get the session object in Execute method?